9 Questions 229 Balancing Chemical Equations 1. Balance the equation for the reaction of sodium metal (Na) with oxygen gas (O2), forming sodium oxide (Na2O).
10 Questions 229 Balancing Chemical Equations 2. Balance the equation for the reaction of tin (Sn) with chlorine gas (Cl2), forming tin chloride (SnCl2).
11 Questions 239 Controlling Chemical Equations 1a. What is activation energy?
12 Questions 239 Controlling Chemical Equations 1B. Describing What role does activation energy play in chemical reactions?
13 1c. Making Generalizations Look at the diagram in Figure 13, and make a generalization about activation energy in exothermic and endothermic reactions.
14 Questions 239 Controlling Chemical Equations 2a. Identifying What are four ways that chemists can control the rates of chemical reactions?
15 Questions 239 Controlling Chemical Equations 2b. Applying Concepts Which would react more quickly in a chemical reaction: a single sugar cube or an equal mass of granulated sugar crystals? Explain.
16 Figure P. 236 Energy Changes in Chemical Equations Both exothermic and endothermic reactions need energy to get started. Draw and compare the graphs. Figure P. 239 Enzyme Action After a reaction, an enzyme molecule is unchanged.