1. Mixtures and Solutions Final Assessment

2. 1. Which of these is a method of separating solutions? A. hand separation B. filtering C. screening D. evaporation

3. Evaporation

4. 2. A solution in which no more material will dissolve is… A. saturated. B. diluted C. concentrated. D. solvent.

5. saturated

6. Brian just figured out that it takes about 35 g of sugar to saturate a cup of iced tea (about 250 ml). He then made a cup of hot tea of the same size. Which amount of sugar might it take to saturate the hot tea? A. 10 g B. 25 g C. 35 g D. 60 g

7. 60 g

8. Which of these is the most soluble in water? A. cereal B. salt C. baking soda D. citric acid

9. Citric acid

10. Susan made a dry mixture of pebbles, flour, and Epsom salts. She added 50 ml of water to the mixture. She wants to separate the materials in this order: first pebbles, second flour, and last Epsom salts. What order is the best way to do this? A. evaporation, filtering, screening B. screening, filtering, evaporation C. filtering, screening, evaporation D. evaporation, screening, filtering

11. B. screening, filtering, evaporating

12. Which of these does not appear as a crystal? A. sand B. salt C. sugar D. snowflakes

13. sand

14. Two saturated citric-acid solutions made at the same temperature always have the same A. amount of citric acid. B. amount of water. C. concentration. D. volume.

15. concentration

16. Jessica made a pitcher of lemonade. What can she do to dilute it if she thinks it doesn’t taste right? A. Add water. B. Add sugar. C. Boil the lemonade. D. Put it in the refrigerator.

17. Add water.

18. Material is added to a beaker of clear, colorless liquid. Which of these is evidence that a chemical reaction has taken place? A. Bubbles are created. B. One material dissolves in the other. C. A solution is formed. D. The mixture becomes cloudy.

19. Bubbles are created.

20. Which of these solutions has the highest concentration? A. One scoop of detergent and 500 ml of water B. one scoop of detergent and 1000 ml water C. two scoops of detergent and 500 ml of water D. Two scoops of detergent and 1000 ml water

21. Two scoops of detergent and 500 ml of water.