Solutions Test Review

A student designs an experiment to test the conductivity of distilled water and salt water. The experimental set-up and results are shown below. Which of the following BEST explains why salt water helped conduct electricity?

• Salt is a strong electrolyte and when dissolved in water, the sodium and chlorine ions bond with water molecules to produce electricity.

• Salt is a strong electrolyte and when dissolved in water, the sodium and chlorine ions are separated and carry electricity through the water.

• Salt is a weak electrolyte and when dissolved in water, the sodium and chlorine ions bond with water molecules to produce electricity.

• Salt is a weak electrolyte and when dissolved in water, the sodium and chlorine ions are separated and carry electricity through the water.

Four students in a physical science class testing different methods of dissolving laundry soap in water. Each student combines 20 grams of soap with 1000 mL of water. The table shows the different methods used by each student. Which of the following shows the most likely order that the students' laundry soap finished dissolving, from the first finished to last?

• Darien → Abdullah → Larissa → Heather

• Heather → Larissa → Abdullah → Darien

• Larissa → Abdullah → Heather → Darien

• Abdullah → Darien → Heather → Larissa

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Does this graph correctly represent which substances can dissolve in water?

• Yes

• No

Tags

NGSS.MS-PS1-2

The solubility of which substance increases at the greatest rate as the temperature increases?

• sodium nitrate

• potassium nitrate

• sodium chloride

• potassium chlorate

Tags

NGSS.MS-PS1-4

The graph shows the solubility curve of an unknown substance.

Which BEST describes the solution at point C?

• saturated

• desaturated

• unsaturated

• supersaturated

The graph shows how many grams of the solids sodium chloride, potassium chloride, and potassium chlorate dissolved in 100 milliliters (mL) of water at various temperatures. Which conclusion can be drawn from the data in the graph?

• At 30°C, the potassium chloride dissolved better than the other solids in the experiment.

• At 50°C, more sodium chloride dissolved in 100 mL of water than potassium chlorate.

• As the energy in the water decreased, the ability of each solid to dissolve increased.

• As the temperature of the water increased, more grams of each solid dissolved.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

How much KNO3 can be dissolved in 100 cm of water at 35°C?

• 45g

• 50g

• 55g

• 60g

Tags

NGSS.MS-PS1-4

Based on the information in the graph, which of the following BEST describes the compound(s) that become less soluble as the temperature increases?

• NH₃ only

• NH₃ and NaCl only

• NaCl and Ce₂(SO₄)₃ only

• NH₃ and Ce₂(SO₄)₃ only

Tags

NGSS.MS-PS1-4

The table below shows the color of three indicators at different pH values.

An unknown liquid is tested with the three indicators:

• The unknown liquid turns litmus paper blue.

• The unknown liquid turns pink when tested with phenolphthalein.

• The unknown liquid turns blue when tested with cabbage juice.

What is the pH of the unknown solution?

• 2

• 6

• 10

• 12

Tags

NGSS.MS-PS1-2

A student adds 10 mL of hydrochloric acid to a 20 ml sodium hydroxide solution. What will most likely happen to the pH of the solution?

• The pH of the solution will increase and become more acidic.

• The pH of the solution will increase and become more basic.

• The pH of the solution will decrease and become more acidic.

• The pH of the solution will decrease and become more basic.

Tags

NGSS.MS-PS1-2