Name_____________________________

Guided Notes Chapter 11: Chemical Reactions

11.1 Describing Chemical Reactions

1. Read page 321. List all the examples of chemical reactions.

2. Read the caption for Figure 11.1. Respond to the question in OBSERVING.

3. Look at the photos and read the caption for Figure 11.2. For each photo list the clues (visual and written)

that tell you a chemical reaction is occurring.

a. b. c.

4. When reading a word equation you could say _____________________, ______________________, or

_________________________________________ when you see an arrow.

5. Write the word equation that describes this reaction. Hydrogen peroxide decomposes to form water and

oxygen gas.

6. What does the word “decomposes” mean? ____________________________________What symbol

represents that in a chemical equation?

7. A chemical equation is ___________________________________________________________.

8. What is the basic set up when writing a chemical equation? Give an example.

9. A skeleton equation is __________________________________________________________________

____________________________________________________________________________________.

10. What is a catalyst and how does it affect chemical reactions?

11. Give an example of how you would indicate the use of a catalyst in a chemical equation?

12. (s):

(l):

(g):

(aq):

13. How does a liquid differ from an aqueous solution?

14. Go back and read Connecting to Your World on page 321. Now that you know a little bit about chemical

equations, try to write the chemical equation for the reaction that occurred on the Hindenburg.

15. Write the skeleton equation for the bicycle analogy. Why is it unbalanced?

16. The coefficients in a balanced chemical equation represent ______________________________________

___________________________________________________________________________________.

17. To write a balanced chemical equation, _______________________________________________________

___________________________________________________________________________________.

18. What is the law of conservation of mass? How is this related to a balanced chemical equation?

19. Do Practice Problems #3-#6. Use your ion reference sheet for help in writing formulas.

#3 #4

#5 #6

20. True/False NaCl(l) is a way to indicate that sodium chloride has been dissolved in water.

21. True/False A catalyst speeds up a chemical reaction without actually being used up in the reaction.

22. True/False Coefficients are used only in front of a chemical formula.

23. True/False This is an example of a balanced chemical equation. Ag2S(s) + Al(s) Al2S3(s) + Ag(s)