Unit 1 Test Review

Which of the following is an example of a chemical change?

• blending milk and a banana to make a smoothie

• breaking a rock

• rotting banana

• hammering metal into a sheet

What effect does stirring have on the dissolution of a solid at 25°C according to Table 4?

• It increases the time to dissolve.

• It decreases the time to dissolve.

• It has no effect on the time to dissolve.

• It doubles the time to dissolve.

What is the role of a solvent in a solution?

• To dissolve the solute

• To be dissolved by the solute

• To react with the solute

• To evaporate the solute

Which of the following processes is a physical change?

• Boiling water

• Burning paper

• Cooking an egg

• Rusting iron

How much solute is dissolved in Flask B?

• 20 g

• 25 g

• 30 g

• 35 g

Which flask has the highest water level and lowest concentration?

• Flask A

• Flask B

• Flask C

• All are equal

Which flask has the same amount of solute as Flask C but more water?

• Flask A

• Flask B

• Flask C

• None

Which experiment is most likely caused by a chemical change?

• Experiment 1

• Experiment 2

• Experiment 3

• Experiment 4

Classify "breaking apart a chocolate bar" as a chemical change or a physical change.

• Chemical change

• Physical change

Classify "burning fuel in a car" as a chemical change or a physical change.

• Chemical change

• Physical change