Answer:
D. when the number of moles of acid is exactly equal to the number of moles of base.
Explanation:
Regarding options A. and E., pKa and pKb would only be taken into consideration if the titrations were of weak acids and bases. However it is possible to have a titration of monoprotic acids and bases with strong acids and bases.
Another way of looking at the answer is identifying which one best describes the equivalence point.
Which of the following best explains how the results of Rutherford’s experiment affected Thomson’s widely-accepted atomic model?
Explanation:
Thomson's suggested the plum pudding model of the atom in which the atomic space is made up of electrons surround by positive charges.
Rutherford in his gold foil experiment revised the plum pudding model of the atom;
He discovered that most of the alpha particles passed through the foil while a few of them were deflected back. To explain this observation, he suggested the atomic model of the atom. In this model, an atom is made up of a small positively charged center where nearly all the mass is concentrated. Surrounding the nucleus is the extranuclear part made up of electrons.why should motorist be careful when putting air in the motor car tyres
Answer:
They might explode. I am serious.
The closer to 7 a substance measures on the pH scale, the ______ the compound fill in the blank
Explanation:
If the PH is greater than 7 then the solution is basicIf the PH is less than 7 then the solution is acidicIf the PH is equal to 7 then the solution is neutral23.1 g of HCl (a strong acid) is added to water to make 1250 mL of solution. Calculate [H3O+] and pH of the solution
Answer:
Following are the solution to this question:
Explanation:
[tex]\to HCl \ mol = \frac{23.1 \ g}{36.5 \frac{g}{mol}} = 0.633 \ mole\\\\\\\to HCl \ molarity = \frac{ 0.633 \ mole }{1.25 L} \\\\[/tex]
[tex]=0.5064 \ m[/tex]
[tex]HCl +H_2O \longrightarrow H_3O^{+} + Cl^{-}\\\\\\[/tex]
[tex][H_3O^{+}] =[HCl] \\\\\to [H_3O^{+}] =0.5064 \ m \\\\\to PH =-\log [H_3O^{+}] \\\\[/tex]
[tex]= -\log (0.5064)\\\\= 0.295 \\\\=0.3[/tex]
Preparation of ethanoic acid from 1,1,1-trichloroethane
15.2 grams of CO2 = ? molecules of CO2
Answer:
2.11 molecules of CO₂
Explanation:
Given data:
Mass of CO₂ = 15.2 g
Molecules of CO₂ = ?
Solution:
Number of moles of CO₂:
Number of moles = mass/molar mass
Number of moles = 15.2 g/ 44 g/mol
Number of moles = 0.35 mol
Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
0.35 mol × 6.022 × 10²³ molecules / 1 mol
2.11 molecules of CO₂
the lewis dot structure for CSBr2?
Answer:
See attached picture.
Explanation:
Hello!
In this case, by considering that the carbon has four valence electrons as it is in group IVA, sulfur has six valence electrons as it is in group VIA and bromine has seven valence electrons as it is in group VIIA we infer that the carbon is the central atom in CSBr2 so one double bond between carbon and sulfur makes it complete the octet and two carbon-to-bromine bonds are formed in order to complete the octets of both carbon and bromine as shown on the attached picture.
Best regards!
Weathering is a constructive process.
True or false
Answer: true
Explanation: Collection and analysis of data indicates that constructive forces include crustal deformation, faulting, volcanic eruption and deposition of sediment, while destructive forces include weathering and erosion.
Suppose of sodium chloride is dissolved in of a aqueous solution of silver nitrate. Calculate the final molarity of chloride anion in the solution. You can assume the volume of the solution doesn't change when the sodium chloride is dissolved in it. Be sure your answer has the correct number of significant digits.
Suppose of sodium chloride is dissolved in of a aqueous solution of silver nitrate. Calculate the final molarity of chloride anion in the solution. You can assume the volume of the solution doesn't change when the sodium chloride is dissolved in it. Be sure your answer has the correct number of significant
A student pipets 5.00 mL of a 5.103 M aqueous NaOH solution into a 250.00 mL volumetric flask and dilutes up to the mark with distilled water. What is the final molarity of the dilute solution?
Answer:
0.102 M.
Explanation:
From the question given above, the following data were obtained:
Volume of stock solution (V1) = 5 mL
Molarity of stock solution (M1) = 5.103 M
Volume of diluted solution (V2) = 250 mL
Molarity of diluted solution (V2) =?
The molarity of the diluted solution can be obtained by using the dilution formula as illustrated below:
M1V1 = M2V2
5.103 × 5 = M2 × 250
25.515 = M2 × 250
Divide both side by 250
M2 = 25.515 / 250
M2 = 0.102 M
Thus, the molarity of the diluted solution is 0.102 M.
The dilution of the NaOH results in the dilution of the molarity of the solution. The molarity of the final NaOH solution is 0.102 M.
What is molarity?Molarity is the concentration unit that defines the amount of solute present in a liter of solution.
The dilution of the solution results in a change in the molarity. It can be accessed as:
[tex]\rm M_1V_1=M_2V_2[/tex]
The initial molarity of the solution is, [tex]\rm M_1=5.103\;M[/tex]
The initial volume of the NaOH is, [tex]\rm V_1=5\;mL[/tex]
The final volume of the NaOH is, [tex]\rm V_2=250\;mL[/tex]
Substituting the values for the calculation of final molarity, [tex]\rm M_2[/tex]:
[tex]\rm 5.103\;\M\;\times\;5.0\;mL=M_2\;\times\;250\;mL\\\\M_2=\dfrac{5.103\;\M\;\times\;5.0\;mL}{250\;mL} \\\\M_2=0.102\;M[/tex]
The molarity of the NaOH solution after dilution is 0.102 M.
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Calculate the final temperature (once the ice has melted) of a mixture made up initially of 70.0 mL liquid water at 28 oC and 5.0 g ice at 0.0 oC.
Answer:
21.52° C
Explanation:
From the given information:
mass of the liquid water = 70.0 mL
Initial temperature = 20°C
mass of the ice = 5.0 g
temperature of ice = 0.0°C
Using the calorimetric function:
heat lost by water = heat gained by ice.
mass of water × specific heat of water (s) × ΔT = mass of ice × specific heat of ice (s) × ΔT + n (ΔH_fusion}
⇒ 70 × 4.184 × (28 -x) = 5 × 2.108(x - 0) + [tex](\dfrac{5}{18})[/tex] × 6.01 × 10³
By solving the above equation,
x = 21.52° C
The final temperature of the mixture of water and ice is 21.5 ⁰C.
The given parameters;
initial volume of the liquid = 70 mL initial temperature of the water, = 28⁰Cmass of the ice, = 5.0 gtemperature of the ice, = 0⁰ Cspecific heat capacity of ice = 2.09 J/g ⁰Cheat of fusion of ice = 333.55 J/gspecific heat capacity of water = 4.184 J/g⁰ Cdensity of water = 1 g/mlLet the final temperature of the mixture = t
mass of the liquid water = 1 g/ml x 70 ml = 70 g
Apply the principle of conservation of energy to determine the final temperature of the mixture;
heat lost by water = heat gained by ice
[tex]70 \times 4.184(28 - t) = 5\times 2.09(t - 0) \ + \ 5 \times 333.55\\\\8200.64 - 292.88t = 10.45 t + 1667.75\\\\303.33t = 6532.89\\\\t = \frac{6532.89}{303.33}\\\\t = 21.5 \ ^0C[/tex]
Thus, the final temperature of the mixture of water and ice is 21.5 ⁰C.
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Draw the organic product formed when 1−hexyne is treated with H2O, H2SO4, and HgSO4.
Answer:
please find the graph image in the attachment.
Explanation:
Which of the following is best for measuring 10.0 ml water
A- conical flask
B- beaker
C- pipett
Answer:
B- beaker
Explanation:
..............
60
х
8
у
x=
04
09
O 16
Answer:
The answer is 16
Explanation:
It needs to be hald of the medium so devide the 2 numbers
How much of the sulfur burnt is normally oxidized to hexavalent state?
A. 35 to 50%
B. 100%
C. 2 - 100%
D. 98%
I feel that it is D but I am not 100% sure sadly.
Blair bought a hutch for her desk that was 23 inches long. The box said that the
hutch was 25 inches long. What was the percent error of the hutch?
give the balanced chemical reaction for the preparation of black oxide from blue vitriol
Answer:
Blue vitriol is crystal copper sulphate
Explanation:
The black oxide is the higher oxide of Copper i.e Cu. It is also called as tenorite. It is solid black in color. It is formed by heating copper with air.
[tex]$2Cu +O_2 \rightarrow 2CuO$[/tex]
Blue vitriol is the crystalline form of copper sulphate. It is also known as copper (II) sulphate.
When heating, the blue vitriol undergoes various steps of changes to the black oxide of copper.
The chemical reaction is --
[tex]$CuSO_4 \cdot5H_2O \rightarrow CuSO_4\cdot 3H_2O {\rightarrow} CuSO_4\cdot H_2O \rightarrow CuSO_3 \rightarrow CuO +SO_2+O_2[/tex]
0.1400 mole of sucrose, C12H22O11, contains ________ moles of C.
can you show me the formula and the correct format
Answer:
it has 12 carbon atoms and 22 hydrogen atoms and 11 oxygen atoms
Explanation:
When placed in 1 L of water, which of the following combinations would give a buffer solution?1. 0.5 mol HClO and 0.5 mol NaClO2. 0.5 mol HBr and 0.5 mol NaF3. 0.5 mol HBr and 1.0 mol NaF4. 0.5 mol HBr and 1.0 mol NaOH
Answer:
3.8 g Fe * 1 mol Fe/55.85 g Fe (molar mass) = .0680 mol Fe
.0680 mol Fe * 2 mol HBr/1 mol Fe (found in formula Fe+2HBr=>FeBr2+H2)=.136 mol HBr
.136 mol HBr*80.912 g HBr/1 mol HBr=11.004 g HBr (or 11 using 2 sig figs)
And the mass of H2 that is produced is 0.14 g
Explanation:
A buffer solution is made by an acid and its salt or a base and its salt. Here, the solution with 0.5 mol HClO and 0.5 mol NaClO₂ can acts as a buffer solution.
What is buffer?Buffer solutions are used to maintain the pH of a solution in a constant. Buffers are of constant pH and they can balance the pH of an acidic or basic buffer without changing its own pH.
There are two types of buffers acidic buffer and basic buffer. An acidic buffer is used to maintain the pH in a certain acidic value and it is prepared by mixing a weak acid with its salt.
Similarly the basic buffer is used to maintain a certain basic pH and it is prepared by mixing a weak base with its salt. Here, HClO, hypochlorous acid is a weak acid and it forms its sodium salt NaClO₂. Mixing equimolar concentration of these two makes a buffer.
No other groups are a pair of acid and salt hence they can't be a buffer. Thus, option a is correct.
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list three facts you know
about atoms.
Answer:
1 atoms are small particles
What is the new concentration for 25mL added to 135mL of .150M
Answer:
The concentration for 25 mL is 0.81 M
Explanation:
Given data:
Initial volume = 135 mL
Initial molarity = 0.150 M
New volume added = 25 mL
Concentration for 25 mL = ?
Solution:
M₁V₁ = M₂V₂
0.150 M × 135 mL = M₂ × 25 mL
M₂ = 0.150 M × 135 mL / 25 mL
M₂ = 20.25 M.mL/25 mL
M₂ = 0.81 M
The concentration for 25 mL is 0.81 M.
When an element'’s mass in grams equals the element’'s atomic mass, how many moles of atoms are contained in that amount of the element?
Answer:
.
Explanation:
What are things animals might do to survive?
Answer:
Animals need food, water, shelter, and space to survive. Herbivores can live only where plant food is available. Carnivores can live only where they can catch their food. Omnivores can live in many places because they eat both plants and animals.
3. What is the total mass of Zinc in ZnCI.?
A bucket gets filled faster at ground floor than at 2nd floor
Answer:
Due to gravitational Force the water exerts more pressure at "ground floor" than at "2nd floor".
Explanation:
Many materials, such as rocks, expand (get larger) when they are heated and contract (shrink) when they are cooled. This change
in size can cause cracks to form and break large rocks into smaller pieces.
In this example, what is caused by heating and cooling?
OA. decay
ОВ.
weathering
OC.
erosion
OD
earthquakes
Answer:
OB: weathering
Explanation:
the cycle of heating and cooling causes stresses called thermal fatigue, this causes the material to break down. In hand, weathering is a physical and chemical process that causes rocks and minerals on the Earth's surface to break down and decompose. Therefore, this matches the process you have described.
Answer:
weathering fun way to imagen it: just imagen u saw ur worst enemie and pretende it is the rock and the wind and ice and water are ur best friends THEN BAM wind and ice and water(ur best friends) make the rock(worst enemie) to dust :D
Which of these lead (II) salts will dissolve to the greatest extent in water?
a. PbSO4, Ksp = 1.7x10^-8
b. PbI2, Ksp = 6.5x10^-9
c. PbCrO4, Ksp = 1.8x10^-14
d. PbS, Ksp = 2.5x10^-27
e. Pb3(AsO4)2, Ksp = 4.0x10^-36
Answer:
a. PbSO4, Ksp = 1.7x10^-8.
Explanation:
Hello!
In this case, since the solubility product indicates how likely a solid is able to ionize and consequently dissolve in water, we can infer that the larger the solubility product Ksp, the more ions are able dissolve in water; therefore the proper answer goes with the largest Ksp, which is a. PbSO4, Ksp = 1.7x10^-8 since the power goes closer to 1 than the other options.
Best regards!
What is Zaitsev's rule?
Answer:
dear I think this help u
Explanation:
In organic chemistry, Zaitsev's rule is an empirical rule for predicting the favored alkene product in elimination reactions. While at the University of Kazan, Russian chemist Alexander Zaitsev studied a variety of different elimination reactions and observed a general trend in the resulting alkenes.
How much heat is required to raise the temperature of 91.5 g of water from its melting point to its boiling point? Express your answer numerically in kilojoules. Can someone answer this for me in decimal form?
Answer:
38.2836 kJ
Explanation:
Mass = 91.5g
Initial Temperature = melting point = 0 C = 273 K (upon converting to kelvin)
Final Temperature = Boiling point = 100 C = 373 K
Heat = ?
They are related by the equation;
H = mCΔT
ΔT = Final - Initial Temperature = 373 - 273 = 100 K
C = specific heat capacity = 4.184 J /gK
H = 91.5 * 4.184 * 100
H = 38283.6 J
To convert to kilojoules, divide by 1000. This leaves us with;
H = 38283.6 / 1000 = 38.2836 kJ
at what pressure does water boil at room temperature 25 ec
Answer: approximately 100 degrees Celsius