Module 7 Review

A student is trying to dissolve a powdered substance in water. Which of the following actions would help the substance dissolve faster?

• cool the water before adding the powder

• crush the powder into smaller pieces before adding

• add the powder all at once without stirring

• leave the mixture undisturbed

Tags

NGSS.HS-PS1-5

Which of the following forms of salt would dissolve the fastest in 100 mL of water?

• 0.2 g finely ground salt

• 0.2 g coarse salt

• 0.2 g salt crystals

• All will dissolve at the same rate.

What happens to the solubility of a gas in a liquid when the temperature of the liquid is increased?

• The solubility of the gas increases.

• The solubility of the gas decreases.

• The solubility of the gas remains unchanged.

• The solubility of the gas first increases, then decreases.

How many grams of NaCl are required to make 500 mL of a 0.400 M solution?

• 11.7 g

• 0.117 g

• 0.00234 g

• 1.17 g

If you want to prepare a 7.5% volume percent solution of methanol in propanol by mixing 45.0 mL methanol, what volume of propanol should you add?

• 515 mL

• 555 mL

• 600 mL

• 45 mL

What is the concentration of a solution that contains 3.6 moles of NaOH dissolved in 600 mL of water?

• 6.0 M

• 5.8 M

• 7.2 M

• 6.5 M

A solution of pH 3 is ______ times more acidic than a solution of pH 5.

• 2

• 10

• 100

• 1000

Which pH values are most likely for a strong base?

• 1–2

• 3–4

• 12–13

• 6–7

What is the concentration of a base that has 2.5 moles of KOH in 0.5 L of water?

• 0.2 M

• 5.0 M

• 2.0 M

• 1.25 M

Which of the following best describes a solution with a pH of 12?

• It has a higher concentration of H3O+ than OH- and turns litmus paper red.

• It has a higher concentration of H3O+ than OH- and turns litmus paper blue.

• It has a higher concentration of OH- than H3O+ and turns litmus paper blue.

• It has a higher concentration of OH- than H3O+ and turns litmus paper red.