1. Conservation of Mass Chapter 16.2 page 660-665

2. What does this say? “U Wn2 gt pza 2nite?” What about this: “No. MaB TPM. CUL8R.”

3. Chemical Equation Like texting, chemical equations are a shorter, easier way to describe a chemical reaction. Chemical equations use chemical formulas and other symbols instead of words to summarize a reaction.

4. Products and Reactants A chemical formula shows what you start with and what you get from a chemical reaction. The substances you have at the beginning are called reactants. After the reaction, the substances you have left are the products.

5. The reactants are what you have at the ________ of a chemical reaction. A) Start B) End C) Equal D) Look like

6. The products are what you have at the ________ of a chemical reaction. A) Start B) End C) Middle

7. What are the reactants in this chemical equation? H 2 + Cl 2 2HCl a)H 2 b)Cl 2 c)2HCl d)H 2 + Cl 2

8. What are the reactants in this chemical equation? A) Methane and Oxygen B) Methane C) Carbon dioxide D) Carbon dioxide and water Methane + OxygenCarbon Dioxide + Water CH 4 + 2O 2 CO 2 + 2H 2 O

9. What are the reactants in this equation? 2H 2 + O 2 2H 2 O a)2H 2 b)2H 2 + O 2 c)2H 2 O d)O 2

10. What are the products in this chemical equation? a) H 2 b) Cl 2 c) 2HCl d) H 2 + Cl 2 H 2 + Cl 2 2HCl

11. What are the products in this chemical equation? A) Methane and Oxygen B) Methane C) Carbon dioxide D) Carbon dioxide and water CH 4 + 2O 2 CO 2 + 2H 2 O Methane + OxygenCarbon Dioxide + Water

12. What are the products in this equation? a) 2H 2 b) 2H 2 + O 2 c) 2H 2 O d) O 2 2H 2 + O 2 2H 2 O

13. Conservation of Mass Matter is not created or destroyed during a chemical reaction.

14. Conservation of Mass The total mass of the reactants equals the total mass of the products.

15. In the demonstration with vinegar and baking soda, what are the reactants? CH 3 CO 2 H + NaHCO 3 ---> CH 3 CO 2 Na + H 2 O + CO 2 A) Vinegar B) Baking soda C) Vinegar and Baking Soda D) Carbon Dioxide

16. In the demonstration with ice melting, what is the product? A) Ice B) Water C) Ice and water D) Carbon dioxide

17. The law of conservation of mass states: “Matter is neither created or ______ in a chemical reaction.” A) Seen B) Destroyed C) Consumed D) Used

18. If the mass of the reactants in a chemical reactions is 156 g, what is the mass of the products? A) 156 g B) 200 g C) 0 g D) 78 g

19. If I start with ice water that has a mass of 22 g and the ice melts, what should be the mass of the water that is left? A) 18 g B) 94 g C) 88 g D) 22 g