9.1-8 | Unit 9 Review

How much KNO₃ solute is saturated at 40 degrees?

• 75g

• 55g

• 65g

• 85g

Which solute is MOST likely a gas?

• KNO₃

• NaNO₃

• KCl

• Ce₂(SO₄)₃

At what temperature can you fully dissolve 140g of NaNO₃?

• You cannot determine this

What type of a solution is 60g NaNO₃ at 40ºC in 100g H₂O?

• Saturated

• Unsaturated

• Supersaturated

Which would NOT increase the rate at which a sugar cube dissolves?

• Reducing the amount of solvent

• Crushing the sugar cube

• Stirring the solution

• Heating the solvent

You can make a solute dissolve more quickly in a solvent by

• adding more solute.

• adding ice.

• heating the solvent.

• removing some solvent.

Tags

NGSS.MS-PS1-4

A solution that contains all of the solute it can hold at a given temperature is

• diluted.

• saturated.

• supersaturated.

• unsaturated.

Three 10 g samples of sugar are represented below.

Sample A dissolves in water more slowly than sample B.

Sample B dissolves more slowly than sample C.

Which of the following best explains why sample A dissolves more slowly than the other two?

• It has the most volume.

• It has the smallest surface area.

• It has the largest number of sugar molecules.

• It has the fewest bonds between sugar modules.

Tags

NGSS.MS-PS1-2

A technican prepared a solution by heating 100 mL of distilled water while adding KCl crystals until no more KCl would dissolve. She then capped the clear solution and set it aside on the lab counter. After several hours she noticed the solution had become cloudly and some solid had settled to the bottom of the flask. Which statement best describes what happened?

• As the solution cooled, evaporation of water increased the KCl concentration beyond its solubility.

• Water molecules, trapped with the KCl crystals, were released after heating.

• At lower temperatures the solubility of KCl decreased and recrystallization occurred.

• At increased temperatures the solubility of KCl increased and remained too high after cooling.

Tags

NGSS.HS-PS1-5

A solution that is able to dissolve additional solute is best described as

• supersaturated.

• concentrated.

• saturated

• unsaturated.