What is in those ziploc bags?

1. Focus Question: What is in
the Ziploc bags?
Mixtures and Solutions
Investigation 3-4B

2. 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?

3. 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?

4. 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?

5. 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.

6. Common Chemical Formulas

7. Atomic Models
1 4
5
2 6
3
7 8