Focus Question: What is in the Ziploc bags?

Mixtures and Solutions

Investigation 3-4B

Summary: Fizz Quiz

• How do you explain the millions of different substances found on Earth?

• What is a chemical reaction?

• What kinds of information do you get from a chemical equation?

• What observations give evidence that a chemical reaction has happened?

• What is the difference between a mixture and a compound?

Problem of the Week-Fizz Quiz

• Ml of gas for 3 sp baking soda and 3 sp calcium chloride?

• Ml of gas for 2 sp baking soda and 1.5 sp calcium chloride?

• For 2000 ml gas, how much carbon dioxide? How much calcium chloride?

Testing Precipitates• What reactants are in each of the bags?

• What products are in each of the bags?

• How could we check your prediction for accuracy?

• Is the precipitate from the calcium-chloride and baking-soda bag calcium carbonate (chalk)? What evidence do you have?

• Is the precipitate from the three-reactant bag calcium carbonate (chalk)? What evidence do you have?

New Precipitate• The white precipitate in the three-

reactant bag is an insoluble substance called calcium citrate.

• Calcium from the calcium chloride reacted with citrate from the citric acid to form calcium citrate.

• Calcium carbonate and calcium citrate are just two of the thousands of substances that can form as a result of chemical reactions.

Common Chemical Formulas

Atomic Models

1 4

5

2 6

3

7 8