Mixtures and solutions 3-4bPresentation Transcript
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.