Chemical Reactions
What is a Chemical Reaction
1. What is the difference between a physical change and a chemical change
2. Give an example of a physical change and a chemical change using paper.
3. What is a chemical reaction?
4. How are new chemicals made?
Evidence of Chemical Reactions
5. How do we know if a chemical reaction has occurred?
6. If evidence of a chemical reaction is present, is that a guarantee that a chemical reaction
occurred? Explain
7. Does all the evidence for a chemical reaction have to be present for a chemical reaction to have
occurred? Explain
Rate of Chemical Reactions
8. How is the chemical rate of a reaction changed?
9. What are the seven factors that affect the rate of chemical reactions?
Types of Chemical Reactions
10. What are the four main kinds of chemical reactions?
11. Identify the following reactions as synthesis, decomposition, replacement, or combustion
a. A + B  C
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b. A + BC  AB + C
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c. 2Ag + S  Ag2S
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d. C6 + O12  6CO2
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e. Cl2 + 2NaBr  Br2 + 2NaCl
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f. CH4 + 2O2  CO2 + 2H2O
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Chemical Equations
12. What is a chemical equation?
13. What are the reactants and where are they found in a chemical equation?
14. What are the products and where are they found in a chemical equation?
15. Why do chemical equations have to be balanced?
16. Complete the following table
Reaction
Photosynthesis
Reactant
Product
Cellular Respiration
17. Identify the reactants and the products in the following reactions
a. Hydrogen gas + Oxygen gas makes water
b. Sugar ferments to ethyl alcohol and carbon dioxide
c. Alcohol + oxygen becomes vinegar and water
d. Burning methane releases carbon dioxide & water
Other
Energy and Chemical Reactions
18. What does the term “thermic” refer to?
19. What does the prefix “endo-“ refer to?
20. What does the prefix “exo-“ refer to?
21. Are the following reactions exothermic or endothermic
a. A + B + Energy  AB
b. AB  A + B + Energy
c. H2O + Energy  2H2 + O2
d. 2H2 + O2  H2O + Energy
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22. Complete the Venn Diagram for Endo and Exo thermic Reactions
Endothermic
Exothermic
Energy
pH
23. Why do we write pH the way we do?
24. Define pH
25. What is an acid
26. What is a base
27. What is a mole?
28. What is the pH of water?
29. Explain why water can act as both an acid and a base
30. What are the three ways we measure the pH of solutions?
31. What are five examples of acids and five examples of bases
32. What is the impact to wildlife if the pH of an ecosystem is altered? Give specific examples.
Chemical Reaction Lab Results
Rate of Chemical Reactions
1. Predict how changing the reactants will change the rate of the reaction?
2. Predict how changing the temperature will change the rate of the reaction?
3. Predict how stirring the mixture will change the rate of the reaction?
4. Predict how increasing the surface area will change the reaction?
5. How did changing the reactants change the rate of the reaction?
6. How did changing the temperature change the rate of the reaction?
7. How did stirring the mixture change the rate of the reaction?
8. How did increasing the surface area change the reaction?
Energy and Chemical Reactions
9. What happened to the temperature of the hydrogen peroxide/yeast mixture?
10. What happened to the temperature of the baking soda/vinegar mixture?
What is a Mole
11. Mass of chalk before writing your name:
12. Mass of chalk after writing your name:
13. Grams of chalk required to write your name:
14. Moles of CaCO3 required to write your name:
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The pH of Beans
15. How many times more acidic is a pH of 6 than a pH of 7? ________
16. How many times more acidic is a pH of 6 than a pH of 8? ________
17. Using this scenario, how many beans would be in a solution with a pH of 3? _____________
18. Using this scenario, how many beans would be a in a solution with a pH of 9. Be careful, this
is a trick question. __________________.
19. In order to make a solution with a pH of 9, what would you have to do
Cabbage Acid and Base
20. Predict and then identify the following as an acid or a base or neutral
a. ___________ Tap Water
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b. ___________ Soda Water
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c. ___________ Vinegar
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d. ___________ Milk
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e. ___________ Cranberry Juice ___________
f. ___________ Apple Juice
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g. ___________ Tums
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h. ___________ Baking Soda
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i. ___________ Bleach
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Measuring pH
21. Predict and then measure the pH of the following substances
a. ___________ Tap Water
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b. ___________ Soda Water
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c. ___________ Vinegar
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d. ___________ Milk
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e. ___________ Cranberry Juice ___________
f. ___________ Apple Juice
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g. ___________ Tums
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h. ___________ Baking Soda
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i. ___________ Bleach
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