1. Chemical Reactions Table of Contents Observing Chemical Change
Describing Chemical Reactions
Controlling Chemical Reactions

2. Observing Chemical Change
Properties of Copper
Pennies are coated with copper. Which are physical properties of copper and which are the chemical properties? What are two additional properties?

3. Observing Chemical Change
Breaking and Making Bonds
Describe what happens to the bonds in each of the steps as oxygen reacts with magnesium.

4. Observing Chemical Change
Plot the data from the table onto the graph. What would be a good name for the graph?

5. Describing Chemical Reactions
Chemical Formulas
The formula of a compound identifies the elements in the compound and the ratio in which their atoms or ions are present. What are the missing chemical formulas in the table?

6. Describing Chemical Reactions
Modeling a Chemical Equation
Like a skateboard, a chemical equation has a basic structure. How many complete skateboards can be made from the parts pictured?

7. Describing Chemical Reactions
Molecules of nitrogen (N2) and hydrogen (H2) react to form ammonia (NH3). How many H2 and N2 molecules are needed to yield two molecules of NH3?

8. Describing Chemical Reactions
Conservation of Mass
In a chemical reaction, matter is not created or destroyed. What is the mass of iron sulfide produced by this reaction?

9. Describing Chemical Reactions
Balancing Chemical Equations
What are the four steps in balancing chemical equations?
Step 1
Step 2
Step 3
Step 4

10. Describing Chemical Reactions
Types of Reactions
What is
each type
of reaction represented?

11. Controlling Chemical Reactions
Activation Energy
A chemical reaction needs a push to the “top of the mountain” to get started. Where has enough activation energy been added to start the reaction?

12. Controlling Chemical Reactions
Graphs of Exothermic and Endothermic Reactions
Each of the graphs shows the amount of energy before and after the reaction. On each graph, determine whether energy is absorbed or released.

13. Controlling Chemical Reactions
Catalysts
Adding a catalyst speeds up a chemical reaction. How would the energy graph change for the same chemical reaction if a catalyst were used?