Yes, it is possible for fatty acid chains to be broken down to produce ATP in the absence of oxygen. This process is called anaerobic respiration or fermentation.
During anaerobic respiration, the fatty acid chains are broken down into smaller molecules, such as acetyl-CoA, which enters the Krebs cycle to produce ATP. However, the amount of ATP produced through anaerobic respiration is much less compared to aerobic respiration. In the absence of oxygen, the breakdown of fatty acids involves:
1. Beta-oxidation: Fatty acid chains undergo beta-oxidation in the mitochondria, where they are broken down into two-carbon units called acetyl-CoA. This process also generates NADH and FADH2, which are electron carriers.
2. Anaerobic glycolysis: Since there is no oxygen available, the acetyl-CoA cannot enter the citric acid cycle (TCA cycle) for further oxidation. Instead, the cell relies on anaerobic glycolysis, which converts glucose into pyruvate and generates a small amount of ATP.
3. Fermentation: Pyruvate is then converted into lactate in a process called fermentation. This regenerates NAD+ from NADH, allowing glycolysis to continue and producing additional ATP.
Although fatty acid chains can be broken down to produce ATP in the absence of oxygen, this process is less efficient compared to aerobic metabolism, which involves the citric acid cycle and the electron transport chain, both of which require oxygen and generate a larger amount of ATP.
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In this experiment cyclohexene is preparedby the phosphoric acid catalyzed dehydration of cyclohexanolaccording to the equaiton below;
Expt 8 equation 1
Questions
1) give a mechanism for the dehydrationreaction performed in this experiment ( the mechanism for theforward and reverse of any reversible reaction must be the sameaccording to the principle of microscopic reversibility).
2) given your answer in 1, would you expectthe rate of the acid catalyzed dehydration of 1-methylcyclohexanol,to be slower, faster, or about the same as for cyclohexanol?explain your answer.
3) why does the equilibrim strongly favor thereverse reaction, hydration of the alkene?
In experiment cyclohexene is prepared by the phosphoric acid catalyzed dehydration of cyclohexanol:
1) The mechanism for the phosphoric acid catalyzed dehydration of cyclohexanol involves protonation of the hydroxyl group by the acid, followed by loss of a water molecule to form a carbocation intermediate. The carbocation then undergoes a deprotonation step to form the final product, cyclohexene. The reverse reaction follows the same mechanism in the opposite direction.
2) The rate of acid catalyzed dehydration of 1-methylcyclohexanol would be slower than for cyclohexanol. This is because the methyl group on the cyclohexanol molecule creates steric hindrance, making it more difficult for the molecule to undergo the necessary conformational changes to reach the transition state required for the dehydration reaction. This results in a higher activation energy and a slower reaction rate.
3) The equilibrium strongly favors the reverse reaction, hydration of the alkene, because the addition of water to the double bond forms a more stable product. This is due to the fact that the double bond in the alkene has a higher energy than the single bond in the alcohol, making the alcohol more stable overall.
Additionally, the presence of excess water in the reaction mixture shifts the equilibrium towards the hydrated product, further favoring the reverse reaction.
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Cumulene What types of orbital overlap occur in cumulene? Check all that apply. S/SP overlap sp2/sp2 overlap s/sp2 overlap sp/sp overlap s/s overlap p/p overlap sp/sp2 overlap You have not identified all the correct answers. What type of orbital does hydrogen use for bonding? What type of hybrid orbitais are used by the carbon atoms adjacent to the hydrogen atoms in this molecule?
sp/sp orbital overlap occur in cumulene.
Hydrogen uses an s orbital for bonding.
carbon atoms adjacent to the hydrogen atoms use sp2 hybrid orbitals for bonding
In organic chemistry, a cumulene is a compound having three or more cumulative (consecutive) double bonds. They are analogous to allenes, only having a more extensive chain.
In cumulene, the types of orbital overlaps that occur are:
1. sp/sp overlap: This occurs between the carbon atoms with linear geometry.
2. sp2/sp2 overlap: This occurs between the carbon atoms with trigonal planar geometry.
3. p/p overlap: This occurs between the p orbitals of carbon atoms, forming pi bonds.
Hydrogen uses an s orbital for bonding.
In cumulene, the carbon atoms adjacent to the hydrogen atoms use sp2 hybrid orbitals for bonding with hydrogen and other carbon atoms.
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in an experiment, it is found that 0.00124 mg of hexachlorobenzene (c6cl6) can be dissolved in 200 ml of water. what is the solubility of hcb in water in units of moles per liter?
The name zinc(II) chloride is correct, and the compound should not be renamed.
The compound zinc(II) chloride is incorrect because it does not properly reflect the actual chemical composition of the compound.
In this compound, zinc is present in its 2+ oxidation state, which means it has lost two electrons to become a cation. Chloride is present in its anionic form, having gained one electron to become a chloride ion.
According to the naming convention for ionic compounds, the cation's name is written first, followed by the anion's name, with the suffix ""-ide"" replacing the ending of the anion name. However, since zinc can form cations with different charges, the charge of the cation is indicated using Roman numerals in parentheses after the metal name.
Therefore, the correct name of this compound should be zinc(II) chloride, indicating that the zinc ion is in the +2 oxidation state.
If the compound actually had two chloride ions for each zinc ion, it would be correctly named zinc chloride, without the need for Roman numerals since zinc only has one possible oxidation state in this case.
In summary, the name zinc(II) chloride is correct, and the compound should not be renamed.
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1. The radius of a platinum atom is 139 pm. How many platinum atoms would have to be laid side by side to span a distance of 7.706 mm?2. The mass of a single lead atom is 3.44×10-22 grams. How many lead atoms would there be in 210 milligrams of lead?3. The volume of a single barium atom is 4.29×10-23 cm3. What is the volume of a barium atom in microliters?
To determine the number of platinum atoms needed to span 7.706 mm, we first need to convert the radius of a platinum atom from picometers (pm) to millimeters (mm). 139 pm = 0.000139 mm
Then, we can calculate how many platinum atoms would be needed:
7.706 mm / 0.000139 mm per platinum atom = 55,432 platinum atoms
Therefore, 55,432 platinum atoms would have to be laid side by side to span a distance of 7.706 mm.
2. To determine the number of lead atoms in 210 milligrams of lead, we first need to convert the mass of a single lead atom from grams to milligrams:
3.44×10-22 grams = 3.44×10-19 milligrams
Then, we can calculate how many lead atoms there are in 210 milligrams of lead:
210 milligrams / 3.44×10-19 milligrams per lead atom = 6.10×1021 lead atoms
Therefore, there are 6.10×1021 lead atoms in 210 milligrams of lead.
3. To determine the volume of a barium atom in microliters, we first need to convert the volume of a single barium atom from cubic centimeters (cm3) to microliters (μL):
4.29×10-23 cm3 = 4.29×10-14 μL
Therefore, the volume of a barium atom is 4.29×10-14 μL.
To determine how many platinum atoms would have to be laid side by side to span a distance of 7.706 mm, first convert the given distance to picometers (1 mm = 1,000,000 pm):
7.706 mm * 1,000,000 pm/mm = 7,706,000 pm.
Next, divide the total distance in picometers by the radius of a single platinum atom (139 pm):
7,706,000 pm / 139 pm/platinum atom = 55,438.85 platinum atoms.
Since you can't have a fraction of an atom, round up to the nearest whole number:
55,439 platinum atoms.
2. To find how many lead atoms would be in 210 milligrams of lead, first convert the mass to grams (1 mg = 0.001 g):
210 mg * 0.001 g/mg = 0.21 g.
Next, divide the total mass in grams by the mass of a single lead atom (3.44 x 10^-22 g):
0.21 g / (3.44 x 10^-22 g/lead atom) = 6.1046511628 x 10^21 lead atoms.
3. To convert the volume of a barium atom from cm^3 to microliters, use the conversion factor (1 cm^3 = 1,000 µL):
4.29 x 10^-23 cm^3/barium atom * 1,000 µL/cm^3 = 4.29 x 10^-20 µL/barium atom.
So, the volume of a barium atom in microliters is 4.29 x 10^-20 µL.
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Derive the expression that relates rate constant to the half-life. Hint: the concentration at this time (t1/2) is half the concentration with which you started. Substitute this information into the equation for a first-order reaction.
For a first-order reaction, the rate law is denoted as: Rate = k[A]; here k is known as the rate constant and [A] is called as the concentration of the reactant.
What is the equation that associates rate constant to the half-life?For a first-order reaction, the concentration of the reactant decreases exponentially with time:
[A] = [A]₀[tex]e^{-kt}[/tex]
where [A]₀ is the initial concentration of the reactant at t = 0.
The half-life ([tex]t_{1/2}[/tex]) of a first-order reaction is the time it takes for the concentration of the reactant to decrease to half its initial value. Therefore, at t = [tex]t_{1/2}[/tex], [A] = [A]₀/2.
Substituting [A] = [A]₀/2 and t = [tex]t_{1/2}[/tex], into the equation for a first-order reaction gives:
[A]₀/2 = [A]₀[tex]e^{-k*t_{1/2} }[/tex]
Simplifying the above equation, we get:
1/2 = [tex]e^{-k*t_{1/2} }[/tex]
The next step is taking the natural logarithm (㏑):
㏑(1/2) = -k* [tex]t_{1/2}[/tex]
Simplifying further, we get:
[tex]t_{1/2}[/tex] = (㏑2)/k
Therefore, the expression that relates the rate constant to the half-life for a first-order reaction is:
k = (㏑ 2)/ [tex]t_{1/2}[/tex]
This equation shows that the rate constant is inversely proportional to the half-life of the reaction, meaning that a shorter half-life corresponds to a faster rate of reaction (larger value of k).
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a diprotic acid has a pka1 = 2.70 and pka2 = 6.50. what is the ph of a 0.10 m solution of this acid that has been one quarter neutralized?
A diprotic acid has two acidic hydrogen atoms, meaning it can donate two protons. The pKa values given tell us the strength of each acidic hydrogen atom.
The pH of a 0.10 M solution of this diprotic acid that has been one quarter neutralized means that 25% of the acid has been converted to its conjugate base. This means that one of the two acidic hydrogen atoms has been neutralized, leaving only one left to donate.
We can use the Henderson-Hasselbalch equation to solve for the pH:
pH = pKa2 + log([A-]/[HA])
We know pKa2 is 6.50 and that one quarter of the acid has been neutralized, which means that [A-]/[HA] is 0.25. We can solve for [HA] by subtracting 0.25 from 1 and multiplying by the initial concentration of 0.10 M:
[HA] = (1-0.25) x 0.10 M = 0.075 M
Now we can plug in the values and solve for pH:
pH = 6.50 + log(0.25/0.075) = 5.41
Therefore, the pH of a 0.10 M solution of this diprotic acid that has been one quarter neutralized is 5.41.
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a student completely reacts 1.898g of zinc with hydrochloric acid and obtains 3.956 g of zinc chloride (zncl2). calculate the percent composition of chlorine in zinc chloride.
The percent composition of chlorine in zinc chloride is approximately 52.01%.
1: The molar mass of zinc (Zn) is 65.38 g/mol, and the molar mass of chlorine (Cl) is 35.45 g/mol. Since there are two chlorine atoms in ZnCl₂, the molar mass of ZnCl₂ is 65.38 + (2 * 35.45) = 136.28 g/mol.
2: Calculate the mass of chlorine in the zinc chloride by subtracting the initial mass of zinc from the final mass of zinc chloride: 3.956 g (ZnCl₂) - 1.898 g (Zn) = 2.058 g (Cl₂).
3: Calculate the percent composition of chlorine in zinc chloride by dividing the mass of chlorine (Cl₂) by the mass of zinc chloride (ZnCl₂), and then multiply by 100%: (2.058 g (Cl₂) / 3.956 g (ZnCl₂)) * 100% = 52.01%.
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In the reaction between glucose and oxygen, 10.0 g of glucose reacts and 7.50 L of carbon dioxide is formed. What is the percent yield if the density of CO2 is 1.26 g/L?
C6H12O6(s) + 6 O2(g) ? 6 CO2(g) + 6 H2O(l)
The percent yield of the reaction between glucose and oxygen, forming 7.50 L of carbon dioxide, is 64.5%.
let's find the theoretical yield of CO2 by using stoichiometry.
1. Calculate the moles of glucose (C6H12O6) using its molar mass (180.16 g/mol):
10.0 g glucose * (1 mol glucose / 180.16 g glucose) = 0.0555 mol glucose
2. Use the stoichiometry of the balanced equation to find the moles of CO2:
0.0555 mol glucose * (6 mol CO2 / 1 mol glucose) = 0.333 mol CO2
3. Convert moles of CO2 to grams using the density of CO2:
7.50 L CO2 * (1.26 g CO2 / L CO2) = 9.45 g CO2 (actual yield)
4. Calculate the theoretical yield of CO2 by multiplying moles of CO2 by its molar mass (44.01 g/mol):
0.333 mol CO2 * (44.01 g CO2 / mol CO2) = 14.65 g CO2 (theoretical yield)
5. Calculate the percent yield using the actual yield and theoretical yield:
Percent yield = (actual yield / theoretical yield) * 100
Percent yield = (9.45 g CO2 / 14.65 g CO2) * 100 = 64.5%
So, the percent yield of the reaction between glucose and oxygen, forming 7.50 L of carbon dioxide, is 64.5%.
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The percent yield of the reaction between glucose and oxygen, forming 7.50 L of carbon dioxide, is 64.5%.
let's find the theoretical yield of CO2 by using stoichiometry.
1. Calculate the moles of glucose (C6H12O6) using its molar mass (180.16 g/mol):
10.0 g glucose * (1 mol glucose / 180.16 g glucose) = 0.0555 mol glucose
2. Use the stoichiometry of the balanced equation to find the moles of CO2:
0.0555 mol glucose * (6 mol CO2 / 1 mol glucose) = 0.333 mol CO2
3. Convert moles of CO2 to grams using the density of CO2:
7.50 L CO2 * (1.26 g CO2 / L CO2) = 9.45 g CO2 (actual yield)
4. Calculate the theoretical yield of CO2 by multiplying moles of CO2 by its molar mass (44.01 g/mol):
0.333 mol CO2 * (44.01 g CO2 / mol CO2) = 14.65 g CO2 (theoretical yield)
5. Calculate the percent yield using the actual yield and theoretical yield:
Percent yield = (actual yield / theoretical yield) * 100
Percent yield = (9.45 g CO2 / 14.65 g CO2) * 100 = 64.5%
So, the percent yield of the reaction between glucose and oxygen, forming 7.50 L of carbon dioxide, is 64.5%.
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Which of the following compounds is the strongest acid?
a. CH3OH
b. BrCH2OH
c. CH3NH2
d. CH3Cl
The strongest acid among the given compounds is b. [tex]BrCH_{2}OH[/tex] (bromomethanol).
This is because it has a halogen (bromine) attached to a carbon that is attached to a hydroxyl group (-OH).
The electronegativity of the halogen pulls electron density away from the hydroxyl group, making it more acidic.
The other compounds do not have this electronegativity difference and therefore do not exhibit strong acidity.
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Calculate the standard entropy change for the reaction at 25 °C. Standard molar entropy values can be found in this table. Mg(OH)2 (s) + 2 HCI(g) — MgCl,(s) + 2 H2O(g) ASixn = J/(K.mol)
The standard entropy change for the given reaction at 25 °C is 3.0 J/(K·mol).
To calculate the standard entropy change (ΔS°) for the given reaction at 25 °C, we need to subtract the standard molar entropies of the reactants from the products.
The standard molar entropy (S°) values for Mg(OH)2 (s), HCl(g), MgCl2 (s), and H2O(g) are 72.8 J/(K·mol), 186.9 J/(K·mol), 89.6 J/(K·mol), and 188.8 J/(K·mol), respectively.
So,
ΔS° = (2 × S°[H2O(g)] + S°[MgCl2 (s)]) - (S°[Mg(OH)2 (s)] + 2 × S°[HCl(g)])
ΔS° = (2 × 188.8 J/(K·mol) + 89.6 J/(K·mol)) - (72.8 J/(K·mol) + 2 × 186.9 J/(K·mol))
ΔS° = 3.0 J/(K·mol)
Therefore, the standard entropy change for the given reaction at 25 °C is 3.0 J/(K·mol).
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7. A certain gas has a molar mass of 28 g/mol. How many grams of this gas would fit in a
750 mL container at 182 kPa and 47.2°C?
750mL
² g (n)) n =
P. 182 KPA
V-0.750
^-
The concept ideal gas equation is used here to determine the mass in grams of the gas. It is also called the general gas equation. The ideal gas law is the state of a hypothetical ideal gas.
The ideal gas law is formed from the combination of Boyles law, Charles's law and Avogadro's law. The state of an ideal gas is determined by both the microscopic and macroscopic parameters like pressure, volume, etc.
182 kPa = 1.79 atm
47.2°C = 320.2 K
750 mL = 0.75 L
The ideal gas equation is:
PV = nRT
1.79 × 0.75 = m / 28 × 0.0821 × 320.2 = 1.43 g
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Determine the moles of benzyl alcohol, C.HSCH,OH, used in the experiment. (To avoid introducing rounding errors on intermediate calculations, enter your answer to four significant figures.)Moles of benzyl alcohol used__ molReactant mass 21.2 g Product mass 18.2 g Molar mass C 12.0 g/mol Molar mass H 1.00 g/mol Molar mass 0 16.0 g/mol
To determine the moles of benzyl alcohol used in the experiment, we need to first calculate the molar mass of benzyl alcohol:
Molar mass of benzyl alcohol = (12.0 g/mol x 7) + (1.00 g/mol x 8) + (16.0 g/mol x 1)
= 98.14 g/mol
Next, we can use the given reactant mass and molar mass to calculate the moles of benzyl alcohol used:
Moles of benzyl alcohol used = reactant mass / molar mass
= 21.2 g / 98.14 g/mol
= 0.2160 mol
Rounding to four significant figures, the moles of benzyl alcohol used in the experiment is 0.2160 mol.
To determine the moles of benzyl alcohol (C7H8O) used in the experiment, we need to first find the molar mass of benzyl alcohol and then use the reactant mass to calculate the moles.
The molar mass of benzyl alcohol is calculated as follows:
C: 7 atoms × 12.0 g/mol = 84.0 g/mol
H: 8 atoms × 1.00 g/mol = 8.00 g/mol
O: 1 atom × 16.0 g/mol = 16.0 g/mol
Adding these values together, we get the molar mass of benzyl alcohol:
84.0 g/mol + 8.00 g/mol + 16.0 g/mol = 108.0 g/mol
Now, we can use the reactant mass and molar mass to calculate the moles of benzyl alcohol used in the experiment:
Moles = (Reactant mass) / (Molar mass)
Moles = (21.2 g) / (108.0 g/mol)
Moles of benzyl alcohol used = 0.1963 mol (rounded to four significant figures)
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what is the ph when 3.9 g of sodium acetate, nac2h3o2 , is dissolved in 300.0 ml of water? (the ka of acetic acid, hc2h3o2 , is 1.8×10−5 .)
The pH when 3.9 g of sodium acetate, NaC₂H₃O₂, is dissolved in 300.0 mL of water is 3.94.
To find the pH when 3.9 g of sodium acetate, NaC₂H₃O₂, is dissolved in 300.0 mL of water, we need to first find the concentration of the acetate ion, C₂H₃O₂⁻.
First, find the moles of sodium acetate.
molar mass of NaC₂H₃O₂ = 82.03 g/mol
moles of NaC₂H₃O₂ = 3.9 g / 82.03 g/mol
= 0.0475 mol
Find the concentration of acetate ion.
volume of solution = 300.0 mL = 0.3 L
concentration of acetate ion = moles of NaC₂H₃O₂ / volume of solution
= 0.0475 mol / 0.3 L
= 0.158 M
Use the Ka of acetic acid, NaC₂H₃O₂, to find the pH.
Ka = 1.8×10⁻⁵
pKa = -log(Ka) = -log(1.8×10⁻⁵) = 4.74 (rounded to 2 decimal places)
pH = pKa + log([C₂H₃O₂⁻]/[NaC₂H₃O₂])
= 4.74 + log(0.158/1)
= 4.74 + (-0.80)
= 3.94 (rounded to 2 decimal places)
Therefore, the pH when 3.9 g of sodium acetate is dissolved in 300.0 mL of water is approximately 3.94.
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an unknown quantity of nh4br is dissolved in 1.00 l of water to produce a solution with
An unknown quantity of NH4Br (ammonium bromide) is dissolved in 1.00 L of water to produce a solution.
The resulting solution's properties, such as concentration or pH, can be determined by further analysis, like titration or spectrophotometry. The quantity of NH4Br and the properties of the solution depend on the desired concentration or application.an unknown concentration of NH4Br in water.
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This has 2 parts a) Calculate the time required for a constant current of 0.831A to deposit 0.387g of Tl3+ as Tl(s) on a cathode. b) Calculate the mass of Tlt that can be deposited as Tl2O3(s) on an anode at a constant current of 0.831A over the same amount of time as calculated previously. Hint: You are recommended to write the relevant equation or half-reaction for each process.
a) To calculate the time required for the deposition of 0.387g of Tl3+ as Tl(s) on a cathode, we need to use Faraday's law of electrolysis, which states that the amount of substance deposited is directly proportional to the amount of charge passed through the electrolytic cell.
The equation for the reduction of Tl3+ to Tl is:
Tl3+ + 3e- -> Tl(s)
The number of moles of Tl3+ required for the deposition of 0.387g can be calculated as follows:
n(Tl3+) = m/M = 0.387g / (204.38 g/mol) = 0.001893 mol
The number of coulombs of charge required for the reduction of 0.001893 mol of Tl3+ can be calculated using Faraday's constant (F):
Q = n(F) = 0.001893 mol x (3 F/mol) = 0.005679 C
The time required for the deposition of 0.005679 C of charge at a constant current of 0.831A can be calculated using the formula:
t = Q/I = 0.005679 C / 0.831A = 6.83 seconds
Therefore, it would take approximately 6.83 seconds for a constant current of 0.831A to deposit 0.387g of Tl3+ as Tl(s) on a cathode.
b) To calculate the mass of Tl2O3(s) that can be deposited on an anode at a constant current of 0.831A over the same amount of time as calculated previously, we need to use the oxidation half-reaction for the formation of Tl2O3:
4 Tl(s) + 3 O2(g) -> 2 Tl2O3(s)
The number of moles of Tl2O3 that can be formed can be calculated as follows:
n(Tl2O3) = (n(Tl) / 4) = (Q / (4 F)) = (0.005679 C / (4 F)) = 0.000432 mol
The mass of Tl2O3 can then be calculated using its molar mass:
m(Tl2O3) = n(Tl2O3) x M(Tl2O3) = 0.000432 mol x (457.39 g/mol) = 0.197 g
Therefore, the mass of Tl2O3 that can be deposited on an anode at a constant current of 0.831A over the same amount of time as calculated previously is approximately 0.197 g.
*IG:whis.sama_ent*
pi3br2 is a nonpolar molecule. based on this information, determine the i−p−i bond angle and the br−p−br bond angle. what is the i−p−i bond angle? [ select ] what is the br−p−br bond angle? [ select ]
The I−P−I bond angle is 180° and
Based on the molecular formula PI₃Br₂, we can deduce that this molecule has a trigonal bipyramidal molecular geometry. In this geometry, the terms you mentioned, I−P−I bond angle and Br−P−Br bond angle, can be determined as follows:
1. I−P−I bond angle: In a trigonal bipyramidal geometry, the bond angle between the axial positions is 180°. Since Iodine atoms are located at the axial positions, the I−P−I bond angle is 180°.
2. Br−P−Br bond angle: In the same trigonal bipyramidal geometry, the bond angle between the equatorial positions is 120°. As the Bromine atoms are located at the equatorial positions, the Br−P−Br bond angle is 120°.
So, the I−P−I bond angle is 180°, and the Br−P−Br bond angle is 120°.
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A sample of H2 collected over H2O at 23 °C and a pressure of 732 mm Hg has a volume of 245 mL. What volume would the dry H2 occupy at 0 °C and 1 atm pressure?[vp H2O at 23 °C = 21 mm Hg] a. 211 mL b. 245 mL c. 218 mL d. 249 mL e. 224 mL
Therefore, the dry H2 would occupy 210.8 mL at 0 °C and 1 atm pressure. The closest answer choice is (a) 211 mL.
To solve this problem, we can use the combined gas law equation:
(P1V1/T1) = (P2V2/T2)
Where P1V1/T1 is the initial condition (sample collected over H2O at 23 °C and a pressure of 732 mm Hg), and P2V2/T2 is the final condition (dry H2 at 0 °C and 1 atm pressure).
First, we need to convert the initial pressure to total pressure by adding the vapor pressure of H2O at 23 °C:
P total = P(H2) + P(H2O) = 732 mmHg + 21 mmHg = 753 mmHg
Now we can plug in the values:
(P1V1/T1) = (P2V2/T2)
(753 mmHg)(245 mL)/(296 K) = (1 atm)(V2)/(273 K)
Solving for V2:
V2 = (753 mmHg)(245 mL)(273 K)/(1 atm)(296 K)
V2 = 210.8 mL
Therefore, the dry H2 would occupy 210.8 mL at 0 °C and 1 atm pressure. The closest answer choice is (a) 211 mL.
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Write in
simplest form
Answer: 7 17/18
Explanation: firstly, convert 1 5/6 into a improper fraction = 5+6/11 = 11/6.
do the same with 4 1/3 = (4*3) = 12 + 1 = 13/3.
then multiply 11/6 * 13/3 = 143/18
this cannot be simplified by cancelling, so see how many times the denominator will go into the numerator.
143/18 = 7 17/18
Decide whether the Lewis structure proposed for each molecule is reasonable or not. BeH2. H---Be----H. Is this a reasonable structure? If not, why not? Yes, it's a reasonable structure, :F: No, the total number of valence electrons is wrong. No, the total number of valence electrons is wrong.
No, the proposed Lewis structure for BeH2 (H---Be----H) is not reasonable. The reason is that the total number of valence electrons is not correctly distributed.
In a reasonable Lewis structure, each atom should achieve a stable electron configuration by sharing or transferring valence electrons. Beryllium (Be) has 2 valence electrons, and each hydrogen atom (H) has 1 valence electron. Therefore, BeH2 has a total of 4 valence electrons.
A reasonable Lewis structure for BeH2 would be:
H-Be-H
In this structure, beryllium shares its 2 valence electrons with the 2 hydrogen atoms. Each hydrogen atom achieves a stable electron configuration with 2 electrons, and beryllium also achieves a stable electron configuration with 4 electrons.
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bonddissociation energy (kj/mol ) c−c350 c=c611 c−h410 c−o350 c=o799 o−o180 o=o498 h−o460 calculate the bond dissociation energy for the breaking of all the bonds in a mole of methane, ch4.
The bond dissociation energy for the breaking of all the bonds in a mole of methane is: 2,190 kJ/mol.
To calculate the bond dissociation energy for the breaking of all the bonds in a mole of methane, [tex]CH^4[/tex], we first need to identify the individual bond energies of each bond in the molecule. Using the provided values, we have:
- C-H bond energy = 410 kJ/mol
- C-C bond energy = 350 kJ/mol
- C=C bond energy = 611 kJ/mol
- C-O bond energy = 350 kJ/mol
- C=O bond energy = 799 kJ/mol
- O-O bond energy = 180 kJ/mol
- O=O bond energy = 498 kJ/mol
- H-O bond energy = 460 kJ/mol
Since methane has four C-H bonds, we will need to multiply the bond energy of C-H by four to get the total bond dissociation energy for all of the C-H bonds. Similarly, we will need to multiply the bond energy of C-C by one, C-O by zero, and C=O by zero since there are no such bonds in methane.
Thus, the total bond dissociation energy for a mole of methane would be:
4 x C-H bond energy + 1 x C-C bond energy + 0 x C-O bond energy + 0 x C=O bond energy
= 4(410 kJ/mol) + 1(350 kJ/mol) + 0(350 kJ/mol) + 0(799 kJ/mol)
= 1,840 kJ/mol + 350 kJ/mol
= 2,190 kJ/mol
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How many moles of ideal gas are in a 325 mL container that has a pressure of
695 torr at 19 °C?
A. 1.24 × 10−2 mol
B. 1.48 × 10−2 mol
C. 9.42 mol
D. 12.4 mol
E. 80.6 mol
The number of moles of ideal gas in a 325 mL container that has a pressure of 695 torr at 19 °C: B. 1.48 × 10^(-2) mol.
To find the number of moles of ideal gas in a 325 mL container that has a pressure of 695 torr at 19 °C, we can use the Ideal Gas Law equation, which is:
PV = nRT
Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
First, we need to convert the given values to appropriate units:
1. Pressure: 695 torr to atm (1 atm = 760 torr)
P = 695 torr * (1 atm / 760 torr) = 0.914 atm
2. Volume: 325 mL to L (1 L = 1000 mL)
V = 325 mL * (1 L / 1000 mL) = 0.325 L
3. Temperature: 19 °C to Kelvin (K = °C + 273.15)
T = 19 °C + 273.15 = 292.15 K
Now we can plug in the values into the Ideal Gas Law equation and solve for n (moles):
0.914 atm * 0.325 L = n * (0.0821 L atm/mol K) * 292.15 K
n = (0.914 atm * 0.325 L) / ((0.0821 L atm/mol K) * 292.15 K) = 1.48 × 10^(-2) mol
So, the answer is B. 1.48 × 10^(-2) mol.
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If a chemist wishes to prepare a buffer that will be effective at a pH of 3.00at 25*C. the best choice would be an acid component with a Ka equal to '9.10x10-6 1.00x103 3.00 9.10x104 '1Ox10-4 .10x10-10 9.10x10-2
The best option would be an acid component with a value of 3.00.
What is the definition of a buffer solution?Buffer Solution is a water-based solvent-based solution composed of a weak acid and its conjugate base, or a weak base and its conjugate acid. They are resistant to pH changes caused by dilution or the addition of small amounts of acid/alkali to them.
To make a buffer with a pH of 3.00, the acid component must have a pKa near 3.00. The pK_a value is the inverse of the acid dissociation constant, (K_a)
We can calculate each acid's pK_a by taking the negative logarithm of its Ka value
pK_a = -log(K_a)
1. K_a = 9.10x10^{-6}
pK_a = -log(9.10x10^{-6}) = 5.04
2. K_a = 1.00x10^{3}
pK_a = -log(1.00x10^{3}) = -3
3. K_a = 3.00
pK_a = -log(3.00) = 0.52
4.K_a = 9.10x10^{4}
pK_a = -log(9.10x10^{4}) = -4.04
5. K_a = 1.0x10^{-4}
pK_a = -log(1.0x10^{-4}) = 4
6. K_a = 1.0x10^{-10}
pK_a = -log(1.0x10^{-10}) = 10
The acid component with the closest pK_a to 3.00 has a Ka of 3.00.
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rtain drain cleaners are a mixture of sodium hvdroxide and powdered aluminum. When dissolved in water the sodium hydroxide reacts with the aluminum and the water to produce hydrogen gas. O 482 mot nl q0 Ch 2 2 Al(s) + 2 NaOH(ag)+6 H00)2 NaA(OH)(aq) +3 H2(g) e sodium hydroxide helps dissolve grease, and the hydrogen gas provides a mixing and scrubbing action. What mass. of hydrogen gas would be formed from a reaction of 2.48g Al and 4.75g NaOH in water?
The mass of hydrogen gas is 0.278g
We can use stoichiometry to determine the mass of hydrogen gas produced from the given amounts of aluminum and sodium hydroxide:
Balanced chemical equation for the reaction:
2 Al(s) + 2 NaOH(aq) + 6 H2O(l) → 2 NaAl(OH)4(aq) + 3 H2(g)
Number of moles of aluminum and sodium hydroxide:
n(Al) = m(Al) / M(Al) = 2.48 g / 26.98 g/mol = 0.092 mol
n(NaOH) = m(NaOH) / M(NaOH) = 4.75 g / 40.00 g/mol = 0.119 mol
The limiting reactant is aluminum.
The number of moles of hydrogen gas produced:
n(H2) = 3/2 * n(Al) = 3/2 * 0.092 mol = 0.138 mol
The mass of hydrogen gas produced:
m(H2) = n(H2) * M(H2) = 0.138 mol * 2.016 g/mol = 0.278 g
Therefore, the mass of hydrogen gas produced from the given amounts of aluminum and sodium hydroxide is 0.278 g.
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An atom will be least likely to form chemical bonds with other atoms when:(a) the number of protons equals the number of electrons.(b) the number of protons equals the number of neutrons.(c) there is only one electron in the valence shell.(d) the valence shell is full of electrons.
The correct answer is (d) the valence shell is full of electrons.
This is because an atom with a full valence shell has no need to gain or lose electrons to form bonds with other atoms. The valence shell is the outermost shell of an atom and it determines the atom's reactivity and ability to bond with other atoms. If the valence shell is full, the atom is stable and does not need to form any additional bonds. However, if the valence shell is not full, the atom will tend to form chemical bonds with other atoms to fill its valence shell and achieve stability.
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The correct answer is (d) the valence shell is full of electrons.
This is because an atom with a full valence shell has no need to gain or lose electrons to form bonds with other atoms. The valence shell is the outermost shell of an atom and it determines the atom's reactivity and ability to bond with other atoms. If the valence shell is full, the atom is stable and does not need to form any additional bonds. However, if the valence shell is not full, the atom will tend to form chemical bonds with other atoms to fill its valence shell and achieve stability.
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calculate the ph of a solution containing 0.10 m ch3cooh and 0.15 m ch3coo-.
To do this, we will use the Henderson-Hasselbalch equation, which relates the pH, pKa, and the concentrations of the acid and its conjugate base.
The equation is: pH = pKa + log10([A-]/[HA])
Here, [A-] is the concentration of the conjugate base (CH3COO-) and [HA] is the concentration of the acid (CH3COOH).
First, we need to find the pKa of CH3COOH. The pKa of acetic acid (CH3COOH) is approximately 4.74. Now, plug in the given concentrations and pKa into the equation: pH = 4.74 + log10([0.15 M]/[0.10 M]) pH = 4.74 + log10(1.5) pH ≈ 4.74 + 0.18 pH ≈ 4.92
Therefore, the pH of the solution containing 0.10 M CH3COOH and 0.15 M CH3COO- is approximately 4.92.
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9. Determine the number of moles of He gas present in 32.4 L at 25C and 120kPa. Gas Law:
Answer:
Explanation:
The ideal gas law is given by:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles of gas, R is the universal gas constant, and T is the temperature.
Rearranging the equation to solve for n, we get:
n = PV / RT
where:
P = 120 kPa
V = 32.4 L
R = 8.31 J/mol·K (universal gas constant)
T = 25°C + 273.15 = 298.15 K (temperature in kelvins)
Substituting the values:
n = (120 kPa * 32.4 L) / (8.31 J/mol·K * 298.15 K)
n = 1.34 mol (rounded to two significant figures)
Therefore, there are approximately 1.34 moles of He gas present in the given conditions.
a gas has a volume of 450 ml at 35°c. if the volume changes to 400 ml, what is the new temperature (give your answer in °c)?
Answer:
31.1°c
Explanation: PV=nRT
The new temperature is approximately 31.67°C. The volume change from 450 ml to 400 ml caused the temperature to decrease.
To find the new temperature, we can use Charles's Law, which states that the volume of a gas is directly proportional to its temperature when pressure and the amount of gas are constant.
The equation for Charles's Law is V₁/T₁ = V₂/T₂
Where V₁ and T₁ are the initial volume and temperature, respectively, and V₂ and T₂ are the final volume and temperature, respectively.
Given that V₁ = 450 ml, T₁ = 35°C, and V₂ = 400 ml, we can rearrange the equation to solve for T₂:
T₂ = ( V₂* T₁) / V₁
T₂ = (400 ml * 35°C) / 450 ml
T₂ ≈ 31.67°C
So, the new temperature is approximately 31.67°C. The volume change from 450 ml to 400 ml caused the temperature to decrease.
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Using only the periodic table arrange the following elements in order of increasing atomic radius:
lead, astatine, radon, bismuth
Astatine, radon, lead, and bismuth is the increasing order of atomic radius.
What causes atomic size to increase?Due to the inclusion of a second electron shell and electron shielding, atomic size grows as you descend a column. As you move right across a row, the size of the atoms gets smaller due to more protons.
Do atoms have a pattern of increasing order?The atomic numbers of the chemical elements are organised in ascending order. Periods are horizontal rows, while groups are vertical columns. Chemical characteristics of elements belonging to the same group are comparable. This is due to the fact that they both have the same valency and amount of outside electrons.
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Discuss the physical appearance of the aqueous tea solution versus the o¬rganic solution; why is tea so dark?
The physical appearance of an aqueous tea solution and an organic solution can vary greatly. Aqueous tea solutions are typically dark in color, ranging from light amber to deep brown.
Organic solutions, on the other hand, can have a range of colors depending on the specific organic material being dissolved. However, in general, they are less likely to be as dark as a tea solution due to the absence of tannins.
Aqueous tea solution: This is a water-based solution, where tea leaves are steeped in hot water. The hot water extracts the tannins and polyphenolic compounds from the leaves, resulting in a dark-colored liquid. The intensity of the color can vary depending on the type of tea and the steeping time. Organic solution: An organic solution typically refers to a liquid containing organic (carbon-based) solvents or compounds.
In summary, the dark color of an aqueous tea solution is mainly due to the extraction of tannins and polyphenolic compounds from tea leaves when steeped in hot water.
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which molecules directly participate in fatty acid synthesis by acting as energy sources?
The molecules that directly participate in fatty acid synthesis by acting as energy sources are acetyl-CoA and ATP. Acetyl-CoA is the primary substrate for fatty acid synthesis, and ATP provides the energy required for the various steps involved in the process. During fatty acid synthesis, acetyl-CoA is converted into malonyl-CoA, which is then used to elongate the fatty acid chain. This elongation process requires ATP as an energy source. Therefore, both acetyl-CoA and ATP play crucial roles in fatty acid synthesis.
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