AnswersTX-Chemistry B-CRUnit Test

Unit Test — Unit test Answers

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1
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Which reaction will produce a solution that does not conduct electricity?

A
CH3OH(l) CH3OH(aq)
Option A
B
CaBr2(s) Ca2+(aq) + 2Br(aq)
Option B
C
HF(g) + H2O(l) H3O+(aq) + F–(aq)
Option C
D
NH3(g) + H2O(l) NH4+(aq) + OH–(aq)
Option D
2
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Which is true about the dissolving process in water?

A
Polar solutes do not dissolve easily in water.
B
Water molecules are attracted by solute ions at the surface of the solute.
C
Water molecules move throughout the solute.
D
Solute molecules pull water molecules away from the surface.
3

Consider the equation below.Mg(s) + 2HCl(aq) MgCl2(aq) + H2(g)Which compound is the gas in this chemical reaction?

Question illustration
A
Mg
B
HCl
C
MgCl2
D
H2
4

Which statement highlights a unique role of water in a biological system?

A
Organisms cannot use it to regulate their body temperature.
B
Few organisms can use it as a living environment.
C
It does not provide structural support to organisms.
D
It provides organisms a medium to transport materials.
5

In a coffee shop, the following coffee samples are prepared for customers.i. 10 g of sugar added to 100 g of coffeeii. 10 g of sugar added to 200 g of coffeeiii. 4 g of sugar added to 200 g of coffeeiv. 4 g of sugar added to 100 g of coffeeBased on the amount of sugar added, which sequence ranks the coffee from the sweetest coffee to the least-sweet coffee?

A
i, ii , iii, iv
B
iii, iv, ii, i
C
iv, i, ii, iii
D
i, ii, iv, iii
6

Which contributes to the polarity of a water molecule?

A
a linear shape along with strong covalent bonds
B
deflection of hydrogen atoms by lone pairs of electrons
C
no difference in the electronegativity of oxygen and hydrogen
D
hydrogen bond formation between water molecules
7

The table below shows four samples of carbon dioxide gas and the temperature of the water that they were dissolved in.SampleTemperature of water (°C)1 782 733 554 63Which of the samples most likely had the lowest solubility?

A
1
B
2
C
3
D
4
8

A number of beakers have different concentrations of a solution. Which statement best describes the most concentrated solution?

A
It has the largest volume.
B
It has the most solute for a given volume.
C
It has the greatest amount of solute.
D
It has the most volume for a given amount of solute.
9

Which substance will most likely dissociate when it is dissolved in water?

A
NO2
B
N2F6
C
CaCl2
D
C6H12O6
10

Given that the molar mass of NaCl is 58.44 g/mol, what is the molarity of a solution that contains 87.75 g of NaCl in 500. mL of solution?Use .

Question illustration
A
0.333 M
B
0.751 M
C
1.50 M
D
3.00 M
11

A 1.00 L volume of HCl reacted completely with 2.00 L of 1.50 M Ca(OH)2 according to the balanced chemical equation below.2HCl + Ca(OH)2 CaCl2 + 2H2OWhat was the molarity of the HCl solution?

Question illustration
A
0.375 M
B
1.50 M
C
3.00 M
D
6.00 M
12

Which term refers to the process by which ions that have entered solution are kept in solution?

A
dissociation
B
electrolyte
C
hydration
D
ionization
13

Which factor causes a decrease in the rate of dissolution?

A
decreasing the amount of solute
B
increasing the stirring of the solution
C
decreasing the surface area of the solute
D
increasing the temperature of the solvent
14

What is the name of a solution whose concentration of solute is equal to the maximum concentration that is predicted from the solute's solubility?

A
dilute
B
saturated
C
unsaturated
D
supersaturated
15

Which describes a property of water that allows plants to transfer it from their roots to their leaves?

A
Water exhibits weak adhesion and cohesion, which allows capillary action to occur.
B
Water exhibits strong adhesion and cohesion, which allows capillary action to occur.
C
Water has low surface tension, which prevents capillary action from occurring.
D
Water has high surface tension, which prevents capillary action from occurring.
16

What happens to water when it freezes?

A
Its mass increases.
B
Its mass decreases.
C
Its density increases.
D
Its density decreases.
17

Which example best shows that the chemistry of water is helpful to plants?

A
Water’s polarity produces a high density, which allows water to move to the leaves.
B
Water’s bent shape causes a slow passage of nutrients up to the leaves of plants.
C
Water’s polarity causes cohesion that pulls other water molecules up through a plant.
D
Water’s bent shape reduces its own passage through the cell membranes of roots.
18

Which is an example of dissociation?

A
C + O2 CO2
Option A
B
NH3 + H2O NH4+ + OH–
Option B
C
SO2 + H2O HSO3– + H+
Option C
D
Ca3(PO4)2 3Ca2+ + 2PO43–
Option D
19

A chemist has dissolved a certain substance in water. The chemist knows that more of the substance could be dissolved into the water before it stops dissolving. Therefore, the current solution is

A
unsaturated
B
saturated
C
supersaturated
20

A chemist dissolved crystals of an unknown substance into water at room temperature. He found that 33 g of the substance can be dissolved into 100 mL of water. What property of the unknown substance was the chemist most likely investigating?

A
its solubility
B
its rate of dissolution
C
its chemical reaction to water
D
its reaction to temperature changes

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