Science 7 Exam - Tuesday March 15th

Just a reminder that your Science exam is on Tuesday, March 15th in period 3. If you did not receive a review sheet due to absence, here are the review questions we worked on in class. These questions and answers will be due at your exam on Tuesday.

1. What is the difference between a mechanical mixture and a solution?

2. If a solvent still has room to dissolve more solute particles it is called a/n ____________________ solution.

3. If a solvent has no more space between its particles to dissolve more solvent it’s called a/n _______________________ solution.

4. When making rock candy we had to create a supersaturated solution. What is the definition of a supersaturated solution?

5. What is the difference between an element and a compound?

6. We made juice in Science class and it tasted great. It was a solution that had just the right mixture of juice crystals and water. What kind of a solution did we create? Dilute, concentrated, saturated, or unsaturated? Circle one.

7. Another name for a homogeneous mixture is ____________________________ .

8. Another name for a heterogeneous mixture is ____________________________ .

9. Name three (3) ways that mechanical mixtures can be separated.

10. Give one example of how components of a solution can be separated.

11. Using the Particle Theory of Matter, explain 3 ways in which you can speed up the rate of dissolving for a particular solute.

12. Orange juice from concentrate (in a can) is an example of a concentrated solution. What does this mean in terms of the amount of solute/solvent in the mixture?

13. What is the term given to the amount of solute (in grams) that can be dissolved in a certain amount of solution?

14. What is the unit of measurement of concentration?

15. Which of the following is more concentrated? A solution of 10g of drink crystals dissolved in 50 mL of water, or a solution of 25g of drink crystals dissolved in 100mL of water?

16. If a saturated solution has a concentration of 20g per 100mL of water, how many grams of the solute could be dissolved in 50mL of water?

17. Why are solutes generally able to dissolve faster in hot water than in cold water? Use the Particle Theory of Matter to support your answer.

18. When solute particles do not bind with solvent particles and therefore cannot be dissolved, the solute is considered _________________.

19. True or false: Glass is a pure substance. (Circle one)

20. Identify at least two raw materials used in making glass.

21. True or false: Soap is a type of detergent. (Circle one)

22. What is a surfactant?

23. Name two components of toothpaste and explain their purpose.

24. What is meant by the term biodegradable? Give one example of a material that would be considered biodegradable, and one that would not.