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

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? Observing Chemical Change

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

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

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?

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? Describing Chemical Reactions

Molecules of nitrogen (N 2 ) and hydrogen (H 2 ) react to form ammonia (NH 3 ). How many H 2 and N 2 molecules are needed to yield two molecules of NH 3 ? 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? Describing Chemical Reactions

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

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

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? 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. 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? Controlling Chemical Reactions

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