Page 33 - Science Course 1 (Book 2)

Question Answer
5. What is sublimation?

6. Describe the movement of
particles when thermal energy
is removed from a gas.

7. What is condensation?

8. What is freezing?

9. What is deposition?

Mo7-L3: Key Concept Check

Direction: Answer the following word problems on the lines provided. Show your work

1. Maria has a sample of water that has a mass of 100 g. She added 20 g of salt to the water. What is the f nal
mass of the saltwater solution?

2. Cara has a sample of salt water with a mass of 382 g. She knows that 94 g of salt were added to the
solution. What is the mass of the solvent in the solution?

3. Jeremy has a solution with a mass of 228 g. He knows that the mass of the solvent was 224 g. How much
is the mass of the solute in the solution?

Direction: On the line before each statement, write the letter of the correct answer

4. During a physical change, the physical properties of matter
A. change.
B. disappear.
C. stay the same.
5. The total mass before and after a physical change
A. increases.
B. decreases.
C. stays the same.
6. Conservation of mass affects
A. only physical changes.
B. only chemical changes.
C. physical and chemical changes.

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