1. What does it mean for an equation to be balanced? We have the same number of each type of atom on each side of the equation. Make sure you have balanced the equation you are given (don’t change subscripts). 1

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7. Figure 6-4 p111

8. Clicker Question Which of the following diagrams best represents the chemical equation N 2 + H 2 → NH 3 after it is balanced? A) + → B) + → + C) + + + + + + → D) + + + → + E) + + + → 8

9. Clicker Question Balance the following equation (standard form) and determine the sum of the coefficients: H 2 O 2 → H 2 O + O 2 A) 3 B) 4 C) 5 D) 6 9

10. Clicker Question Balance the following equation (standard) and determine the coefficient for water: CaC 2 + H 2 O → C 2 H 2 + Ca(OH) 2 A) 1 B) 2 C) 3 D) 4 10

11. Clicker Question What is the correct unbalanced chemical equation for the reaction of iron(II) oxide with oxygen gas to produce iron(III) oxide? A) FeO + O 2 → Fe 2 O 3 B) FeO 2 + O 2 → Fe 2 O 3 C) FeO 2 + O 2 → Fe 3 O 2 D) FeO + O 2 → Fe 3 O 2 E) FeO 2 + O 2 → FeO 11

12. Clicker Question Balance the following equation and determine the sum of the coefficients: C 2 H 5 OH + O 2 → CO 2 + H 2 O A)4 B)5 C)8 D)9 E)10 12