AnswersSY2026-27 - 2003340 Chemistry 1 Sem 2 CRWriting and Balancing Chemical Equations

Writing and Balancing Chemical Equations — Unit test Answers

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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 .

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

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?

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A
15 g
B
24 g
C
40 g
D
240 g
4

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
5

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.
6

Which is an example of a nonaqueous solution?

A
gasoline
B
fog
C
mayonnaise
D
fruit juice
7

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
8

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
9

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.
10

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.
11

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.
12

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
13

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

A
caffeine
B
sugar
C
vanilla
D
water
14

Brownian motion is not observed in a mixture that includes two phases. Which best identifies the mixture?

A
a colloid
B
a suspension
C
a solution
D
an alloy
15

Which factor influences both solubility and the rate of dissolution?

A
pressure
B
temperature
C
particle size
D
nature of solvent

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