1. Mixtures and Solutions
Investigation
3 and 4
Focus Questions

2. How could you test a soft drink to determine if it is a solution or a Mixture?

3. How could you test a soft drink to determine if it is a solution or a mixture?
Filter it.

4. How would you know if you had made a saturated soft-drink solution?

5. How would you know if you had made a saturated soft-drink solution?
Undissolved powder settles to the bottom when the solution is saturated.

6. How do you know that a soft-drink solution is a concentrated solution?
How do you know that a soft-drink s0lution is A dilute solution?

7. How do you know that a soft-drink solution is a concentrated solution?
It will taste sweet and will be darker in color.
How do you know that a soft-drink s0lution is A dilute solution? It will taste weak and will be lighter in color.

8. Concentration refers to the amount of material dissolved in a measure of liquid. The ________ material dissolved in a given amount of liquid, the _________concentrated the solution.

9. Concentration refers to the amount of material dissolved in a measure of liquid. The more material dissolved in a given amount of liquid, the more concentrated the solution.

10. How can you determine the relative concentrations of solutions?

11. How can you determine the relative concentrations of solutions?
When equal volumes of two solutions are compared on a balance, the heavier one is more concentrated.

12. Name 4 safety rules to remember when working with chemicals.

13. Name 4 safety rules to remember when working with chemicals.
Clean up spills immediately.
Keep chemicals off clothes and skin and away from eyes. Rinse with water if chemicals do contact skin, eyes, or clothes.
Never taste laboratory chemicals.
Wash hands at the end of the activity.

14. What happens when a solution is made with water and two different solutes?

15. What happens when a solution is made with water and two different solutes?
Sometimes when two (or more) chemicals are mixed, changes take place and new materials form.

16. How do you know when a chemical reaction has occurred?

17. How do you know when a chemical reaction has occurred?
Changes, such as heat, gas formation, and precipitate formation, are evidence of a chemical reaction.

18. When two or more materials (chemicals) are mixed together and a change occurs, a ___________ ________________
Has taken place.

19. When two or more materials (chemicals) are mixed together and a change occurs, a chemical reaction Has taken place.

20. Which chemicals reacted to form a gas?
Which chemicals reacted to form a precipitate?

21. Which chemicals reacted to form a gas?
Calcium chloride and baking soda; citric acid and baking soda
Which chemicals reacted to form a precipitate?
Calcium chloride and baking soda

22. How can you find out if the liquid that came through the filter is a solution?

23. How can you find out if the liquid that came through the filter is a solution?
If the liquid is a solution, it might be separated by evaporation.

24. When two chemicals react when they are mixed, the chemicals are called reactants. What were the reactants that produced gas and precipitate in the “Zip Bag” Investigation?

25. When two chemicals react when they are mixed, the chemicals are called reactants. What were the reactants that produced gas and precipitate in the “Zip Bag” Investigation?
Calcium chloride and baking soda