AnswersTX-Chemistry BUnit Test

Unit Test — Unit test Answers

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1
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Which represents a double replacement reaction and would occur?

A
NH4NO3(aq) + AgCIO3(aq) AgNO3(aq) + NH4CIO3(aq)
Option A
B
Na2CO3(aq) + CaCl2(aq) 2NaCl(aq) + CaCO3(s)
Option B
C
NaF(aq) + KCl(aq) NaCl(aq) + KCl(aq)
Option C
D
NaCl(aq) Na+(aq) + Cl-(aq)
Option D
2
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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
3

The table shows the characteristics of four substances after they are placed in water.Substance Ion concentrationElectrical conductivity WMediumGoodXLowPoorYHighExcellentZNoneNoneWhich compound is most likely the strongest electrolyte?

A
W
B
X
C
Y
D
Z
4

Consider the reaction below.Fe(s) + CuSO4(aq) Cu(s) + FeSO4(aq)Which reactant is a substance that is dissolved in solution?

Question illustration
A
Fe
B
Cu
C
CuSO4
D
FeSO4
5

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
6

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
7

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
8

Which factor influences both solubility and the rate of dissolution?

A
pressure
B
temperature
C
particle size
D
nature of solvent
10

Which describes the polarity in a water molecule?

A
partial negative charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms
B
partial negative charge on the oxygen atom because it pulls electrons from the hydrogen atoms
C
partial positive charge on the oxygen atom because it pulls electrons from the hydrogen atoms
D
partial positive charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms
13

Which term refers to the formation of ions as a result of a chemical reaction?

A
dissociation
B
electrolyte
C
hydration
D
ionization
14

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.
15

Which is most likely true about water in chemical systems?

A
Water dissolves nonpolar ionic compounds.
B
Water dissociates ionic compounds.
C
Water dissociates covalent molecules.
D
Water dissolves nonpolar covalent substances.
16

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.
17

Which best explains why water has a much higher boiling point than would otherwise be predicted?

A
Water forms weak hydrogen bonds.
B
Water forms strong hydrogen bonds.
C
Water has weak cohesive forces.
D
Water has strong adhesive forces.
18

Water is called the “universal solvent.” Which statement best explains this description with respect to ionic compounds?

A
Water can dissociate all ionic compounds through ion-dipole interactions.
B
Water can hydrate many ionic compounds through hydrogen-bonding interactions.
C
Water can dissociate many ionic compounds through ion-dipole interactions.
D
Water can hydrate many ionic compounds through dipole-dipole interactions.
19

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

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Unit Test — Unit test Answers — TX-Chemistry B