1. Chemistry Daily 10’s Week 13

2. 1 1. What is the study of the mass relationships of elements in compounds? a. reaction stoichiometry b. composition stoichiometry c. percentage yield d. Avogadro's principle

3. 2. The coefficients in a chemical equation represent the a. masses, in grams, of all reactants and products. b. relative numbers of moles of reactants and products. c. number of atoms in each compound in a reaction. d. number of valence electrons involved in the reaction.

4. 2 1. A balanced chemical equation allows one to determine the a. mole ratio of any two substances in the reaction. b. energy released in the reaction. c. electron configuration of all elements in the reaction. d. mechanism involved in the reaction.

5. 2. To balance a chemical equation, it may be necessary to adjust the a. coefficients. b. subscripts. c. formulas of the products. d. number of products.

6. 3 1. A chemical equation is balanced when the a. coefficients of the reactants equal the coefficients of the products. b. same number of each kind of atom appears in the reactants and in the products. c. products and reactants are the same chemicals. d. subscripts of the reactants equal the subscripts of the products.

7. 2. Given the equation, the starting mass of A, and its molar mass, and you are asked to determine the moles of C produced, your first step in solving the problem is the multiply the given mass of A by a. b. c. d.

8. 4 1. In what kind of reaction do two or more substances combine to form a new compound? a. decomposition reaction b. combustion reaction c. double-displacement reaction d. synthesis reaction

9. 2. In the reaction represented by the equation N 2 + 3H 2  2NH 3, what is the mole ratio of hydrogen to ammonia? a. 1:1 b. 2:1 c. 3:2 d. 6:8

10. 5 1. In the equation 2KClO 3  2KCl + 3O 2, how many moles of oxygen are produced when 3.0 mol of KClO 3 decompose completely? a. 1.0 mol b. 2.5 mol c. 3.0 mol d. 4.5 mol

11. 2. For the reaction represented by the equation AgNO 3 + NaCl  NaNO 3 + AgCl, how many moles of silver chloride, AgCl, are produced from 7.0 mol of silver nitrate AgNO 3 ? a. 1.0 mol b. 2.3 mol c. 7.0 mol d. 21 mol

12. Answers & Standards 1.1ANS:BSTA:SC2.d 1.2ANS:BSTA:SC2.d 2.1ANS:ASTA:SC2.d 2.2ANS:ASTA:SC2.d 3.1ANS:BSTA:SC2.d 3.2ANS:CSTA:SC2.d 4.1ANS:DSTA:SC2.d 4.2.ANS:CSTA:SC2.d 5.1.ANS:DSTA:SC2.d 5.2.ANS:CSTA:SC2.d