1. Ch. 21 Review

2. Balance the following equation.
NaCl + H2  HCl + Na
2,1,2,2

3. What are the 2 reactants in the following equation?
2NaCl + H2  2HCl + 2Na
NaCl and H2

4. What type of reaction is this?
2NaCl + H2  2HCl + 2Na
Single displacement

5. Breaking down substances into two or more new substances is _____.
decomposition

6. In a chemical equation what does (s) mean?
solid

7. In a chemical equation, what abbreviation means dissolved in water?
(aq)

8. When one element replaces another in a compound, the reaction is a(n) _______ reaction.
Single displacement

9. What type of reaction is the following a representation of?
Compound=element + element
decomposition

10. What are the numbers that precede formulas in equations to balance called?
coefficient

11. What is a substance that speeds up a chemical reaction called?
catalyst

12. What word does the arrow in a chemical equation represent?
produces, or forms or yields

13. What symbol would be used in a chemical equation to show that a substance is a gas?

14. What are BHT and BHA examples of?
inhibitors

15. What are BHT and BHA used for?
Food preservatives- slow down spoiling

16. What type of reaction is the following a representation of?
Compound+compound = compound + compound
Double displacement

17. If 13g of hydrogen and 4g of oxygen react completely to form water, what is the mass of the water created?
13+4= 17 g

18. A chemical reaction in which the energy released is primarily in the form of heat is __________.
exothermic

19. True/False? Catalysts are changed during a chemical reaction.

20. What type of reaction is the following a representation of?
Element + compound = element + compound
Single displacement

21. If heat energy is required for a chemical reaction to take place, the reaction is __________.
endothermic

22. What is the name of an insoluble solid that forms as a result of a double displacement reaction?
precipitate

23. What does the law of conservation of mass say?
NaCl and H2

24. If 30g of water is decomposed to form 10g of hydrogen, how much oxygen is produced?

25. If 3 atoms of lithium are in the reactants, how many are in the products according to the law of conservation of mass? 3

26. What type of reaction is the following a representation of?
Element + element = compound
synthesis

27. When this equation is balanced, what is the coefficient in front of H2?
H2 + O2  H2O 2

28. What type of reaction is this? 2H2 + O2  2H2O
synthesis

29. Final Jeopardy
Make your wagers

30. What is used to determine whether elements can replace each other in a single displacement reaction?
Activity series