The correct statements regarding the formation of electrophiles are:
B) This mechanism predicts the rate law, rate-k[Cl[FeCl3 which is not in agreement with that observed rate.
D) This mechanism requires that all aromatics, both electron-rich and electron-poor react at the same rate.
What is an Electrophile?An electrophile is a chemical entity that joins with nucleophiles by taking up a pair of electrons in chemistry. Electrophiles are Lewis acids because they receive electrons. The majority of electrophiles have an atom that has a partial positive charge, is positively charged, or lacks an octet of electrons.
Explanation:1st statement is wrong. Because a mechanism with 4 steps is possible.
2nd statement is correct. Because in the rate determining step only Cl2 and FeCl3 are involved.
3rd statement is wrong. Because if Cl+ is unstable. Then its formation must be rate-determining step. It will not be a fast step.
4th statement is correct. Because the attack of benzene on Cl+ is a fast step. Therefore electron-rich and electron-poor aromatic will react at the same rate.
The correct statements regarding the formation of electrophiles are:
B) This mechanism predicts the rate law, rate-k[Cl[FeCl3 which is not in agreement with that observed rate.
D) This mechanism requires that all aromatics, both electron-rich and electron-poor react at the same rate.
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select all that apply which of the following options correctly describe the structure shown? select all that apply.
A given sample of n2 gas has a pressure of 0. 30 atm at 30. 0 °c. If the volume is 2. 0 l, how many moles of n2 are present?.
There would be 0.0781 mol of N2 at 0.3 atm pressure and 30 °C.
How can Avogadro's number be used to find moles?By multiplying or dividing, one can utilize Avogadro's number to convert between molecules and moles: To convert from moles to molecules, multiply the number of moles by 6.02 x 1023. To convert the amount of molecules to moles, multiply it by 6.02 x 1023.
How do you count moles?The molar volume of a gas is 22.414 L/mol at STP, which is defined as 0°C (273.15 K, 32°F) and 1 atm.
Calculate the moles of nitrogen in 1.75 L at STP using dimensional analysis.
1.75 L N2 divided by 1 mole per 22.414 L equals 0.0781 mol N2 to three 2 digits.
What is a mole's value?6.02214076 x 1023 of any chemical unit, such as atoms, molecules, ions, and others, constitute a mole. The mole is a useful measure to employ because any substance is made up of a lot of atoms, molecules, or other parts.
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the term 100% shut off means: the term 100% shut off means: gas burner and regulator is shut off gas to a pilot and the manifold is shut off. gas to the manifold and burner is shut off gas to the regulator and burner is shut off.
The term 100% shut off means: gas burner and regulator is shut off gas to a pilot and the manifold is shut off.
The 100% shutoff system is the system where where the failure in the flame device system take place and the in both the the pilot valve and the main gas valve are shut off . the complete shut off means that the pilot should shut off for any reason, the gas valve will not allow any gas to flow either that is to the main burner or to the pilot burner thus is means the 100% shutoff system
Thus, the 100% shutoff system means the failure in the flame proving device.
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Use the periodic table to find the atomic masses of H and O
Move the pink numbers into the equation (blue and yellow boxes).
Solve the equation.
Write the
answer in the
green box.
You're wanting to figure out the molar mass of H2O2, which tells you the mass of one mole of this compound. There are 2 hydrogen (H) atoms and 2 oxygen (O) atoms in one molecule of H2O2, so you have to add the masses of these 4 atoms.
Different elements have different molar masses. When you look at hydrogen (H) on a periodic table (if you looked up "periodic table" and hover over H with your cursor), there will be a number, 1, that shows how many protons an atom of hydrogen has, and there will be another number (that's relevant to this problem), 1.0078 (or rounded to 1.008), that shows the mass of an atom of that element. Looking on a periodic table, hydrogen has a molar mass of 1.008 and oxygen has a molar mass of 15.999.
To figure out the molar mass of H2O2, you add two hydrogen atoms, which each have a mass of 1.008, with two oxygen atoms, which each have a mass of 15.999.
2 (1.008) + 2 (15.999) = molar mass of H2O2
1. Which has greater solubility: baking soda or table sugar? Why?
table sugar, because much more of it can be dissolved in water.
baking soda, because it makes a solvent bubble.
table sugar, because it makes a solvent sweet.
baking soda, because much more of it can be dissolved in water.
Section 1: Correctly name as many compounds and ions as you can: 1. Ba2+ 2. I- 3. Ti 2+ 4. Rn 5. Ba Cl2 6. CO2 7. SO42- 8. SO4 9. (NH4)2 S 10. KClO3 11. Ca CO3 12. Ga(CN)3 13. S2O4 14. C3F6 15. K2 SO3 16. Sn3(PO4)2
Naming of compounds and ions are listed below:
1. Ba²⁺ : Barium cation
2. I³⁻ : Triiodide ion
3. Ti²⁺ : Titanium cation
4. Rn : Radon
5. Ba: Barium
6. Cl₂ : Chlorine
7. SO₄²⁻ : Sulphate ion
8. SO₄ : Sulphate ion
9. (NH₄)₂S : Ammonium sulphate
10. KClO₃ : Potassium chlorate
11. CaCO₃ : Calcium carbonate
12. Ga(CN)₃ : Gallium(III) Cyanide
13. S₂O₄ : Dithionite
14. C₃F₆ : Hexafluorocyclopropane
15. K₂SO₃ : Potassium sulfite
16. Sn₃(PO₄)₂ : Tin(II) phosphate.
Is every compound an ion?All substances are either molecular or ionic. A molecular compound is made up of molecules whose chemical composition reflects the amount of atoms that are really bound together in the molecule. The bond lengths and angles between the atoms' bonds together give the compound a distinct form.
Ionic bonds are the result of strong electrostatic interaction between nearby cations and anions. Sodium chloride, also known as table salt or NaCl, is the most typical kind of ionic substance. Ionic compounds do not have molecules, in contrast to covalent compounds.
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Hybridization predicts geometry best for:
A. small atoms
B. large atoms
C. electronegative atoms
D. gaseous atoms
Covalent bonds are formed when two or more atoms (often...) share electrons. Better (more stable) than larger formal charges are smaller ones.
Does molecular geometry or electron geometry underlie hybridization?The electron geometry is the foundation for hybridization. Observe the VSEPR Table to ascertain the hydridization of a molecule's core atom. How do sp3 orbitals come into being? The combination of one s and three p orbitals results in four sp3 orbitals.
What are the distinctions between shape and geometry in hybridization?When a molecule's geometry shows how bond pairs and lone pairs are arranged around the central atom as well as the coordination number of the molecule. The lone pairs around the central atom.
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You heat 1.237 g of a mixture of Fe3O4 and FeO to form 7.237 g Fe2O3. The mass of oxygen reacted is.
The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore the mass of oxygen reacted is 6gram.
What is law of conservation of mass?According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.
Fe[tex]_3[/tex]O[tex]_4[/tex]+ FeO +oxygen [tex]\rightarrow[/tex] Fe[tex]_2[/tex]O[tex]_3[/tex]
Mass of Fe[tex]_3[/tex]O[tex]_4[/tex]+ FeO =1.237 Grams
Mass of Fe[tex]_2[/tex]O[tex]_3[/tex]= 7.237 grams
According to law of conservation f mass
Mass of Fe[tex]_3[/tex]O[tex]_4[/tex]+ FeO + mass of oxygen = Mass of Fe[tex]_2[/tex]O[tex]_3[/tex]
Substituting the values we get
1.237+ mass of oxygen = 7.237
mass of oxygen =6gram
Therefore the mass of oxygen reacted is 6gram.
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What is the osmotic pressure of a 0.431 M solution of sodium phosphate (Na₃PO₄) in water at a temperature of 40.0 °C? Assume the sodium phosphate completely dissociates in water. R = 0.08206 L･atm/K･mol
The osmotic pressure of a 0.431 M solution of sodium phosphate in water is equal to 44.25 atm.
What is osmotic pressure?The osmotic pressure of a solution can be defined as the minimum pressure that needs to be applied to a solution to prevent the flow of the solvent across a semipermeable membrane. The determination of the tendency of a solution to take in a solvent by osmosis is called osmotic pressure.
To determine the osmotic pressure of the solution the concentration of the compound can be determined.
π = i × CRT
Given the concentration of the solution, C = 0.431 M
The temperature, T = 40.0 °C = 40 + 273 = 313 K
The value of the gas constant, R = 0.08206 L･atm/K･mol
The number of ions on the dissociation of sodium phosphate, i = 4
The osmotic pressure of the solution of sodium phosphate is:
π = 4× 0.431 × 0.082 ×313
π = 44.25 atm
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The prevailing atmospheric pressure on a plateau in Colorado is 0.732 atm. Express this pressure in pounds per square inch, kilopascals, pascals, millimeters Hg, and inches Hg.
Hint: 1 atm = 101.3 kPa = 1.013×105 Pa = 760 mm Hg = 14.69 psi = 29.92 in Hg
The given atmospheric pressure in different units is equal to:
0.732 atm = 10.75 psi
0.732 atm = 74.2 kPa
0.732 atm = 7.41 ×10⁴ Pa
0.732 atm = 556.32 mmHg
0.732 atm = 21.9 Hg
What is atmospheric pressure?Atmospheric pressure can be defined as the pressure within the atmosphere of Earth. The standard atmosphere is expressed as a symbol atm and is equal to a unit of pressure 101,325 Pa.
The atm unit can be described as equivalent to the sea-level atmospheric pressure on Earth and is equal to 1 atm.
Given, the 1 atm is equal to = 14.69 psi
Then 0.732 atm will be equal to = 14.69 × 0.732 = 10.75 psi
the 1 atm is equal to = 101.3 kPa
Then 0.732 atm will be equal to = 101.3 kPa × 0.732 = 74.2 kPa
the 1 atm is equal to = 1.013×10⁵ Pa
Then 0.732 atm will be equal to =1.013×10⁵ Pa× 0.732 = 7.41 ×10⁴ Pa
1 atm is equal to = 760 mmHg
Then 0.732 atm will be equal to = 760 × 0.732 = 556.32 mmHg
1 atm is equal to = 29.92 Hg
Then 0.732 atm will be equal to = 29.92 × 0.732 = 21.9 Hg
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A chemist prepares a solution of potassium permanganate (KMNO4) by measuring out 4.6 umol of potassium permanganate into a 300.mLvolumetric flask and filling the flask to the mark with water.Calculate the concentration in mmol/Lof the chemist's potassium permanganate solution. Round your answer to 2 significant digits.
The concentration of potassium permanganate solution is 0.015 mM.
Use the equation given below to calculate the molarity of solution,
Mili molarity of the solution = [Mili moles of solute × 1000]/[Volume of solution in mL]
Given,
Moles of the solute = 4.6 × 10⁻³ mmol
Volume of the solution = 300 mL
Substituting the values we get,
Mili molarity of the solution = [Mili moles of solute × 1000]/[Volume of solution in mL]
Mili molarity of the solution = [4.6 × 10⁻³ × 1000]/300 = 0.015 mM
Hence the mili molarity of the solution of potassium permanganate is 0.015 mM.
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Which of the following molecules are polar? A. NH3 B. SF4 C. XeF4 D. CCl4
E. CO2
A. NH3 & B. SF4 are the two best options. They have polar bonds, which makes them polar molecules.
Describe polar bonds.A polar covalent link is a type of covalent bond where the atoms are attracted to electrons in uneven amounts, resulting in unequal sharing. When two molecules form a polar covalent link, also known as a polar molecule, the electron distribution surrounding a molecule is no more symmetrical.
How can I tell whether a connection is polar?Despite the lack of hard and fast standards, the general rule is that a bond is termed nonpolar if the gap in electronegativities is smaller than or equal to 0.4, and polar if indeed the difference is greater.
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Step 1:2NO⇄(NO)2(fast)
Step 2:(NO)2+O2⇄2NO2(slow)
The elementary steps in a proposed mechanism for the reaction 2 NO(g)+O2(g)→2NO2(g) are represented by the equations above. Which of the following is the rate law for the overall reaction that is consistent with the proposed mechanism?
Rate=k[NO]2[O2] of the following is the rate law for the overall reaction that is consistent with the proposed mechanism.
What is an elementary step?A simple set of reactions known as elementary steps or elementary reactions illustrate the progression of a reaction now at molecular level. The series of simple steps that together make up a full chemical reaction is known as a reaction mechanism.
What is the slowest elementary step?A reaction that requires two or more basic stages is considered to be multistep or complex. An intermediary is a chemical creature that is created in one basic stage of either a reaction and eliminated in the following. In a reaction system, the step that moves the slowest is the rate-determining step.
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aluminum reacts with hcl to produce h2 gas and alcl3 . write the balanced chemical equation for this reaction. if x
substituted twice.In the arrow, the reactants are on the left and the products are on the right.
What happens when HCl and AlCl3 interact?The dissolution of the metal in hydrochloric acid results in the production of aluminum chloride and colorless hydrogen gas.Because the finished products do not interact, this reaction cannot be stopped.Hydrochloric acid reacts with metallic aluminum to produce an oxidation-reduction process.
What happens when Al and HCl are combined?Aluminum chloride (AlCl3) is the product of almost all reactions between hydrochloric acid and aluminum (or its derivatives).Water and organic solvents like nitrobenzene, dichloroethane, and acetone work well to dissolve the salt.
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Please help! I am stuck with this question!
The enthalpy of reaction for the given reaction is -1172 KJ. The formation enthalpy of oxygen is zero. Option D is correct.
What is reaction enthalpy?Enthalpy change of a reaction is the change in heat energy absorbed or released from a reaction. The change in enthalpy of a reaction is the difference of sun of change in enthalpies of the products and sum of change in enthalpies of the reactants.
Here, the reaction enthalpy can be written as:
ΔH(rxn) = [(6 ΔHf (H₂O) + (4 ΔHf (NO)] - [(4 ΔHf (NH3) + (5 ΔHf (O₂)].
The formation enthalpy of molecular oxygen in its standard state is 0.
Thus, ΔH(rxn) = [(6 × (-286 ) + (4 × 90) kJ/mol ] - [(4 × (-46 kJ/mol) ]
= -1172 kJ.
Therefore, the reaction enthalpy for the given reaction is - 1172 kJ.
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Choose all of the following that are true about the endpoint of a titration with 1:1 stoichiometry using phenolphthalein indicator.
a)The amount of analyte equals the amount of titrant added.
b)The solution will change from colorless to a faint pink color that lasts 30 seconds or so.
c)The amount of analyte is twice the amount of titrant added.
d)The amount of analyte is half the amount of titrant added.
e)The solution will change from colorless to a bright pink.
The following are correct about the endpoint of a titration
a)The amount of analyte equals the amount of titrant added.
b)The solution will change from colorless to a faint pink color that lasts 30 seconds or so.
d)The amount of analyte is half the amount of titrant added.
e)The solution will change from colorless to bright pink.
The endpoint of a titration is the point at which the reaction between the reactants is complete, resulting in the formation of a precipitate, color change, or another measurable indicator. The endpoint is typically determined by an indicator, a compound that changes color at a certain pH.
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A student runs 7km in 2 hours to train for sports.what is the students average speed
The students average speed of the student is 3.5 km/h.
What is speed?Speed is known to be calculated as the ratio of distance traveled and time traveled. It is a scalar quantity since it only has magnitude and not direction. Velocity is the percentage of time an object moves along a path, and Velocity is expressed as the rate and direction of an object's movement.
The mathematical calculation of speed is relatively simple, calculating the average velocity of an object by dividing the distance traveled by the time it took the object to travel that distance. Velocity, on the other hand, is mathematically complex and can be calculated in different ways depending on what information is available about the object's motion.
Speed = Distance/Time
Speed = 7km/2h
Speed = 3.5 km/h
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Use your calculator to solve. Write your answer in scientific notation with the correct number of significant figures.
4.6 x105 mi
5.2 x10-2 yr
= _______________mi/yr
By the use of the scientific notation, the results in miles per year is 8.8 * 10^6 mi/yr.
What is the scientific notation?We know that the scientific notation has to do with the expression of a number in such a way that the umber would take up the least space. In this case we have to recall that we need to use the exponents to reduce the bulk of the figures that we would have needed to write.
Given that we have been asked to express the result or the quotient in the unit of miles per year while we take cognizance of the significant figures, we can write;
4.6 x10^5 mi/5.2 x10^-2 yr
= 8.8 * 10^6 mi/yr
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Identify reagents that can be used to accomplish the following transformation:
The transformation above can be performed with some reagent or combination of the reagents listed below. Give the necessary reagents in the correct order, as a string of letters (without spaces or punctuation, such as "EBF"). If there is more than one correct solution, provide just one answer.
CH3MgBr is a reagents that can be used to accomplish the following transformation.
When primary alcohol is oxidised with a mild oxidising agent, it produces aldehyde, and when oxidised with a strong oxidising agent, it continues to oxidise.
carnosic acid Secondary alcolin does not undergo oxidation with oxidising agents gure ketone and textiary alcohol due to a lack of replaceble H bonded to carbon.
What is the name of ch3mgbr?
Methylmagnesium bromide.
When Grignard reagent CH3MgBr is treated with water we get?
Grignard reagent is not water stable and interacts with it. The interaction of methylmagnesium bromide (CH3MgBr) with water (H2O) produces methane (CH4) and MgBr (OH). This reaction efficiently hydrolyzes water to generate products.
Hence CH3MgBr is a correct answer.
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See page 467
17 Question (1 point)
A bomb calorimeter can be used to measure the enthalpy of reaction for combustions, such as the combustion of diborane represented by the
following balanced equation:
B₂H(g) + 30₂(g) →→→→ B₂O3(s) + 3H₂O(g)
-
AHcombustion for this process is -1958 kJ/mol.
V
1st attempt
Assume that 0.541 g of diborane is combusted in a calorimeter whose heat capacity (Ccalorimeter) is 7.854 kJ/°C at 22.61°C. What is the
final temperature of the calorimeter?
°C
4
12 OF 17 QUESTIONS COMPLETED
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SUBMIT ANSWER
dicyclohexylcarbodiimide (dcc) assists in the conversion of a carboxylic acid and an amine into an amide .
In order to prepare amide bonds, dicyclohexylcarbodiimide (DCC) was first used as a coupling reagent by Sheehan and Hess in 1955.
Since then, DCC has been employed for peptide synthesis. An O-acylisourea active intermediate plays a role in the creation and propagation of an amide or peptide bond in this process. It would be difficult to overestimate the significance of the typical carboxylic acid reaction with dicyclohexylcarbodiimide (DCC) and amines to produce amides in the synthesis of peptides, especially in the solid phase (Scheme 1). Dicyclohexylcarbodiimide, sometimes known as DCC, is a dehydrating agent typically employed in the laboratory to manufacture proteins. It removes a water molecule from the amino acids involved in the creation of the peptide bond and forms a suitable leaving group.
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Give the overall and net ionic equations for the titration of HCl with NaOH. If the titration was performed with BTB, what is observed at the endpoint?
HCl(aq) + NaOH (aq) ⇒ H2O (l) +NaCl (aq) [ titration ]
H+ + OH ⇒ H2O (l)
The definition of titration:A titration is a method for figuring out all the concentration of the solution by using a solution with known concentration. Until the reaction is finished, the titrant (the known solution) is typically added from the a buret to a known volume of the analyzer (the unknown solution).
How is titration performed?A burette, which is basically a long, graduated measurement rod with such a stopcock and a distribution tube at its bottom end, is used to gradually administer a standard solution of titrant reagent, or titrant, to a specified concentration.
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The picture shows a bicyclist increasing speed while riding down a hill during a bicycle race.
Which statement BEST describes the potential and kinetic energy of this bicyclist?
The best way to sum up the cyclist's potential and kinetic energy is to say that as she progresses up the hill, her kinetic energy rises and her potential energy falls.
What is potential and kinetic energy?The object or system is unaffected by external factors like air pressure or altitude. On the other hand, kinetic energy refers to the force of moving particles within a system or an object.
Kinetic energy is the energy a thing has as a result of motion. A force must be applied to an object in order to accelerate it.We have to work hard in order to apply a force. Once the work is finished, energy is transferred to the item, at which point it moves at a new, constant speed.
What is difference between potential and kinetic energy?Potential energy is the energy that an object or system has stored as a result of its placement or configuration. An object's kinetic energy is measured in relation to stationary and moving items in its immediate environment. Potential energy is independent of an object's surroundings.
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Normal saline solution (the kind you receive intravenously for medical purposes) is made by dissolving 9.0 g of sodium chloride in water and diluting it to 1000. mL. What is the sodium concentration in normal saline solution in mM?
The sodium concentration in normal saline solution in mM is 154.1 millimoles.
What is molarity?
Molarity (M) is calculated by dividing the volume of the solution (V) in liters by the number of moles of solute (n). Not moles of solute per liter of solvent, but rather moles of solute per liter of solution, is an important distinction to remember when defining molarity.
Molarity = no of moles /volume in liter
[tex]Number of moles = given weight /molecular weight[/tex]
1000 ml = 1 liter
Molarity = (9/58.4)/ 1
=0.1541M = 154.1 mM
Number of moles = 0.1541
= 154.1 millimoles
Therefore, the sodium concentration in normal saline solution in mM is 154.1 millimoles.
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Write the balanced equation for the reaction of the acid anhydride N2O5 with water. Give the balanced reaction in molecular form (do not show any dissociated ions) for the formation of the acid when it is dissolved in water.
Do not include state (phase) information for the reactants or products.
Exclude any coefficients equal to 1.
Answer:
N2O5 + H2O => 2HNO3
Explanation:
N2O5 + H2O => 2HNO3
N = 2
O = 6
H = 2
I hope this helps.
. Cause and Effect Robert is cooking red
cabbage in tap water and notices that the
water turns purple. When he adds the vinegar
required by the recipe, the water turns pink.
Explain what happened.
Answer:
rfjc I N E NUMBER ++78+47+97+38+06--+78+47+97+38-06--I N E
Answer: The water becomes more acidic
Explanation:
Since the average ph of water is 7 and vinegar is an acidic substance with a ph ranging from 2-3. When it is added to water which is also a neutral substance, the water becomes more acidic.
If 24.65 mL of 1.12 M NaOH are needed to completely react with the acetic acid, how many moles of acetic acid are contained in the sample?
If 24.65 mL of 1.12 M NaOH are needed to completely react with the acetic acid then 0.0275072 mol of NaOH is present in the sample.
What is acetic acid?Acetic Acid is the colorless acidic and organic compound with the organic formula of CH3COOH.It has a Molar mass of 60.052 g/mol.
Uses:Used as :
Food preservativeFood additiveFor making ink , dye photographic chemicals and pesticides.Solution:As per the given data i.e. :
Volume of NaOH= 24.65 mL=0.02456L
Molarity (M) of NaOH= 1.12 M
The reaction taking place is :
NaOH + CH3COOH →CH3COONa+ H2O
Now to find the no. of moles in NaOH =
moles in NaOH = V in L * M
moles in NaOH= 0.02456 L * 1.12 M
moles in NaOH= 0.0275072 mol
Hence 0.0275072 mol of NaOH is present in the sample.
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0.0275072 mol of sodium hydroxide are present in the sample if 24.65 mL of 1.12 M NaOH are required to thoroughly react with the acetic acid.
Acetic acid: what is it?
Acetic acid is an organic, colorless molecule with the chemical formula CH3COOH.
Its molecular weight is 60.052 g/mol.
Uses:
used for
Preservative for food
food supplement
for the production of insecticides, dyes, and photographic chemicals.
Solution:
Given the information, namely:
NaOH volume: 24.65 mL (0.02456 litres).
NaOH has a molarity (M) of 1.12 M.
The following reaction is occurring:
CH3COONa + H2O = NaOH + CH3COOH
How many moles are there in NaOH?
NaOH moles = V in L * M
moles = 0.02456 L * 1.12 M in NaOH
mol in NaOH = 0.0275072 mol
There is therefore 0.0275072 mol of NaOH in the sample.
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Which parts of Cell Theory did the scientists Matthais Schleiden and Theodor Schwann help to establish?
Answer: Matthias Schleiden helped to establish Cell theory that concluded all plant tissues are made of cells and embryonic plant arose from a single cell. Whereas Theodor Schwann told that both animals are made up of cells and these cells have independent lives.
Explanation:
In 1838, Matthias Schleiden, a German botanist, concluded that all plant tissues are composed of cells and that an embryonic plant arose from a single cell. He declared that the cell is the basic building block of all plant matter. This statement of Schleiden was the first generalizations concerning cells.
This statement of Schleiden was the first generalizations concerning cells. Schleiden investigated plants microscopically and conceived that plants were made up of recognizable units, or cells. He thought plant growth came about through the production of new cells, which, he speculated, came from the nuclei of old cells. Although later discoveries proved him wrong about the role of the nucleus in mitosis, his conception of the cell as the common structural unit of plants shifted study from to processes going on in a living cell.
Schwann concluded three things that became vital components of the cell theory. First, Schwann concluded that both plants and animals were composed of cells. Second, these cells have independent lives. Third, these independent lives are subject to the organism's life.
The cell is the basic unit of life. This statement was the second generalization concerning cells and is the most important in the development of biology.
It became known as the cell theory.
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The modern periodic table waspropased bay lather meyer
Dmitri Mendeleev and Lothar Meyer independently developed the periodic law in 1869. Mendeleev developed the first periodic table, which was quickly followed by Meyer.
What is periodic table ?The periodic table, also known as the periodic table of the elements, is an arrangement of chemical elements in rows and columns. It is widely used in chemistry, physics, and other sciences, and is widely regarded as a chemistry icon.
Meyer is best known for his contribution to the periodic table of elements. He observed, as did John A. R. Newlands in England, that arranging the elements in the order of their atomic weights resulted in groups of similar chemical and physical properties repeated at regular intervals.
Thus, Mendeleev developed the first periodic table, which was quickly followed by Meyer.
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If 14 grams of Aluminum reacts with 23 grams of Oxygen it will yield grams of Aluminum oxide.
The yield of aluminum oxide is 47g
What is aluminum ?
Chemical element aluminium (Al), also written aluminium, belongs to the major Group 13 (IIIa, or boron group) of the periodic table. It is a light, silvery white metal. The most common nonferrous metal and the most plentiful metallic element in the crust of the Earth is aluminium.
What is oxygen ?
Chemical elements are substances that only contain one sort of atom, such as oxygen. An oxygen atom contains eight protons in its nucleus, as indicated by its atomic number of 8 and official chemical symbol, O. At room temperature, oxygen is a gas that is flavorless, odorless, and colorless.
We first need to write down a balanced equation for the reaction:
4Al+3O2→2Al2O3
Now, we determine the number of moles of aluminum: 25.0g27.0g/mol=0.93mol
We know that 4 moles of Al react with 3 moles of O2, so the mole ratio is 4:3. This means we need (3/4)*0.93 mol= 0.69 mol of O2. If we multiply this by the molar mass of O2 (32 g/mol), we get 22.2 g of oxygen needed.
We know that for every 4 moles of Al, there will be formed 2 moles of Al2O3, so the mole ratio is 2:1. This means we will get 0.46 moles of Al2O3. Multiply by the molar mass of Al2O3 (102 g/mol), and we get 47 g.
Therefore, the yield of aluminum oxide is 47g.
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