AnswersDSD-CR-Chemistry-Term 3Unit Test

Unit Test — Unit test Answers

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A solution contains 90 mL of methanol, 18 mL of propanol, and 2 mL of diethyl ether. Which is the solvent in this solution?

A
methanol
B
propanol
C
diethyl ether
D
water
2
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Which statement accurately describes part of the dissolving process of a polar solute in water?

A
Solute molecules repel water molecules.
B
Water molecules surround solute molecules.
C
Water molecules are strongly attracted to nonpolar substances.
D
Solute molecules remain concentrated in one part of the solvent.
3

Which is an example of a nonaqueous solution?

A
gasoline
B
fog
C
mayonnaise
D
fruit juice
4

best

a
a colloid
a
a suspension
a
a solution
a
an alloy
5

A can of soda contains many ingredients, including vanilla, caffeine, sugar, and water. Which ingredient is the solvent?

c
caffeine
s
sugar
v
vanilla
w
water
6

The graph below shows how solubility changes with temperature.How many grams of NaCl will be needed to form 600 mL of a saturated solution at 100°C?

Question illustration
A
15 g
B
24 g
C
40 g
D
240 g
7

Which factor influences both solubility and the rate of dissolution?

A
pressure
B
temperature
C
particle size
D
nature of solvent
8

Which of these factors will cause a solid solute to dissolve faster?

A
increasing the air temperature
B
increasing the amount of solute
C
increasing the amount of solvent
D
increasing the surface area of solute
9

Which statement best describes the process of making a solution by diluting a stock solution?

A
Add more solute to decrease the concentration.
B
Add more solute to increase the concentration.
C
Add more solvent to decrease the concentration.
D
Add more solvent to increase the concentration.
10

Why is citric acid added to food?

A
to add color
B
to add tartness
C
to add bitterness
D
to add sweetness
11

An acid is a substance that increases the concentration of H3O+ ions in solution. Look at the reaction below of phenol (C6H5OH) with water:Which reactant acts as an acid by contributing a H+ ion to create H3O+ in the chemical equation?

Question illustration
A
C6H5OH(aq)
B
H2O(l)
C
C6H5O–(aq)
D
H3O+(aq)
12

A chemist dilutes a 1.0 mL sample of 2.0 M KNO3 by adding water to it. If the concentration of the solution that is obtained is 0.0080 M, what is its volume?Use .

Question illustration
A
125 mL
B
250 mL
C
500 mL
D
2,000 mL
13

The pH of lemon juice at 298 K is found to be 2.32. What is the concentration of ions in the solution? Use .

Question illustration
A
1.05 times 10 to the negative 3 moles per liter.
Option A
B
4.79 times 10 to the negative 3 moles per liter.
Option B
C
2.09 times 10 squared moles per liter.
Option C
D
9.55 times 10 squared moles per liter.
Option D
14

A 150 mL sample of hydrochloric acid (HCl) completely reacted with 60.0 mL of a 0.100 M NaOH solution. The equation for the reaction is given below.HCl + NaOH NaCl + H2OWhat was the original concentration of the HCl solution?

Question illustration
A
0.040 M
B
0.25 M
C
1.50 M
D
2.50 M
15

Four different solutions (I, II, III, and IV) are labeled on the pH scale below.Why would solution IV be considered the most concentrated base out of the four substances?

Question illustration
A
It has the highest concentration of hydrogen ions.
B
It has the highest concentration of hydronium ions.
C
It has the highest concentration of oxide ions.
D
It has the highest concentration of hydroxide ions.
16

How does litmus paper identify a base?

A
A base turns red litmus blue.
B
A base turns blue litmus red.
C
A base turns orange litmus red.
D
A base turns yellow litmus blue.
17

An unknown substance turns methyl orange solution red. This shows that the substance

A
is a base.
B
is water.
C
is an acid.
D
is an alkaloid.
18

Which of these equations correctly expresses the self-ionization of water?

A
Upper H subscript 2 upper O superscript plus upper H subscript 3 upper O superscript plus double-headed arrow upper H subscript 2 upper O plus upper O upper H superscript minus.
Option A
B
Upper H subscript 2 upper O plus upper H subscript 2 upper O double-headed arrow 2 upper O upper H superscript minus.
Option B
C
Upper H subscript 2 upper o plus upper H subscript 2 upper O double headed arrow 2 upper H subscript 3 upper O superscript plus.
Option C
D
Upper H subscript 2 upper O plus upper H subscript 2 upper O double-headed arrow upper H subscript 3 upper O superscript plus, plus upper O upper H superscript minus.
Option D
19

Several substances are labeled on the pH scale below.Which substance has the lowest [H+] concentration but is still considered an acid?

Question illustration
A
milk
B
blood
C
gastric fluid
D
household lye
20

The molar mass of KCl is 74.55 g/mol. If 8.45 g KCl are dissolved in 0.750 L of solution, what is the molarity of the solution?Use .

Question illustration
A
0.113 M
B
0.151 M
C
6.62 M
D
11.3 M

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