Chapter 7 Prep-Test ID: A. Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.
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1 ID: A Chapter 7 Prep-Test Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. A chemical reaction has NOT occurred if the products have a. the same mass as the reactants. b. less total bond energy than the reactants. c. more total bond energy than the reactants. d. the same chemical properties as the reactants. 2. Which observation does NOT indicate that a chemical reaction has occurred? a. formation of a precipitate c. evolution of heat and light b. production of a gas d. change in total mass of substances 3. After the correct formula for a reactant in an equation has been written, the a. subscripts are adjusted to balance the equation. b. formula should not be changed. c. same formula must appear as the product. d. symbols in the formula must not appear on the product side of the equation. 4. In writing an equation that produces hydrogen gas, the correct representation of hydrogen gas is a. H. c. H 2. b. 2H. d. OH. 5. What is the small whole number that appears in front of a formula in a chemical equation? a. a subscript c. a ratio b. a superscript d. a coefficient 6. To balance a chemical equation, it may be necessary to adjust the a. coefficients. c. formulas of the products. b. subscripts. d. number of products. 7. 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. 8. How would oxygen be represented in the formula equation for the reaction of methane and oxygen to yield carbon dioxide and water? a. oxygen c. O 2 b. O d. O 3 9. Which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen? a. Carbon plus oxygen yields carbon dioxide. b. C + O 2 CO 2 c. CO 2 C + O 2 d. 2C + O CO In an equation, the symbol for a substance in water solution is followed by a. (1). c. (aq). b. (g). d. (s). 11. When the equation Fe 3 O 4 + Al Al 2 O 3 + Fe is correctly balanced, what is the coefficient of Fe? a. 3 c. 6 b. 4 d. 9 4
2 Name: ID: A 12. Which coefficients correctly balance the formula equation NH 4 NO 2 (s) N 2 (g) + H 2 O(l)? a. 1, 2, 2 c. 2, 1, 1 b. 1, 1, 2 d. 2, 2, Which coefficients correctly balance the formula equation CaO + H 2 O Ca(OH) 2? a. 2, 1, 2 c. 1, 2, 1 b. 1, 2, 3 d. 1, 1, After the first steps in writing an equation, the equation is balanced by a. adjusting subscripts to the formula(s). b. adjusting coefficients to the smallest whole-number ratio. c. changing the products formed. d. making the number of reactants equal to the number of products. 15. What is the balanced equation for sulfur combining with oxygen gas to produce sulfur dioxide? a. S(s) + O 2 (g) SO(g) c. 2S(s) + 3O 2 (g) SO 3 (s) b. S(s) + O 2 (g) SO 2 (g) d. S(s) + 2O 2 (g) SO 2 4 (aq) 16. Chemical reactions. a. occur only in living organisms c. only occur outside living organisms b. create and destroy atoms d. produce new substances 17. Chemical equations. a. describe chemical reactions b. show how to write chemical formulas c. give directions for naming chemical compounds d. describe only biological changes 18. Symbols used in equations, together with the explanations of the symbols, are shown below. Which set is correct? a. (g), grams c. (aq), dissolved in water b. (l), liters d. s, solid product 19. In the chemical equation H 2 O 2 (aq) H 2 O(l) O 2 (g), the O 2 is a. a. catalyst c. product b. solid d. reactant 20. Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide? a. P(s) O 2 (g) PO 2 (g) c. P(s) O 2 (g) P 2 O 5 (s) b. P(s) O(g) P 5 O 2 (g) d. P 2 O 5 (s) P 2 (s) O 2 (g) 21. If you rewrite the following word equation as a balanced chemical equation, what will the coefficient and symbol for fluorine be? nitrogen trifluoride nitrogen fluorine a. 6F 2 c. 6F b. F 3 d. 3F What are the coefficients that will balance the skeleton equation below? AlCl 3 + NaOH Al(OH) 3 NaCl a. 1, 3, 1, 3 c. 1, 1, 1, 3 b. 3, 1, 3, 1 d. 1, 3, 3, What are the coefficients that will balance the skeleton equation below? N 2 + H 2 NH 3 a. 1, 1, 2 c. 3, 1, 2 b. 1, 3, 3 d. 1, 3, 2 2
3 Name: ID: A 24. When the equation Fe Cl 2 FeCl 3 is balanced, what is the coefficient for Cl 2? a. 1 c. 3 b. 2 d When the following equation is balanced, what is the coefficient for HCl? Mg(s) HCl(aq) MgCl 2 (aq) H 2 (g) a. 6 c. 1 b. 3 d Which of the following statements is NOT true about what happens in all chemical reactions? a. The ways in which atoms are joined together are changed. b. New atoms are formed as products. c. The starting substances are called reactants. d. The bonds of the reactants are broken and new bonds of the products are formed. 27. When the equation KClO 3 (s) KCl(s) + O 2 (g) is balanced, the coefficient of KClO 3 is. a. 1 c. 3 b. 2 d In every balanced chemical equation, each side of the equation has the same number of. a. atoms of each element c. moles b. molecules d. coefficients 29. What are the missing coefficients for the skeleton equation below? Cr(s) Fe(NO 3 ) 2 (aq) Fe(s) Cr(NO 3 ) 3 (aq) a. 4, 6, 6, 2 c. 2, 3, 3, 2 b. 2, 3, 2, 3 d. 1, 3, 3, What are the missing coefficients for the skeleton equation below? Al 2 (SO 4 ) 3 (aq) KOH(aq) Al(OH) 3 (aq) K 2 SO 4 (aq) a. 1, 3, 2, 3 c. 4, 6, 2, 3 b. 2, 12, 4, 6 d. 1, 6, 2, When potassium hydroxide and barium chloride react, potassium chloride and barium hydroxide are formed. The balanced equation for this reaction is. a. KH BaCl KCl BaH c. 2KOH BaCl 2 2KCl Ba(OH) 2 b. KOH BaCl KCl BaOH d. KOH BaCl 2 KCl 2 BaOH 32. The product of a combination reaction is Ba(OH) 2. If one of the reactants is H 2 O, what is the other reactant? a. Ba 2 O c. BaH b. BaO d. BaO For the formula equation 2Mg + O 2 2MgO, the word equation would begin a. Manganese plus oxygen... c. Magnesium plus oxygen... b. Molybdenum plus oxygen... d. Heat plus oxygen XeF 4 + H 2 O XeO 3 + Xe + HF + O 2 a. 5, 10, 2, 3, 20, 2 c. 2, 20, 3, 2, 10, 5 b. 1, 5, 1, 3, 10, 2 d. 10, 20, 4, 6, 40, 4 3
4 Name: ID: A Matching Match each item with the correct statement below. a. product d. balanced equation b. reactant e. skeleton equation c. chemical equation 35. a chemical equation that does not indicate relative amounts of reactants and products 36. a new substance formed in a chemical reaction 37. a starting substance in a chemical reaction 38. a concise representation of a chemical reaction 39. an equation in which each side has the same number of atoms of each element 4
5 ID: A Chapter 7 Prep-Test Answer Section MULTIPLE CHOICE 1. ANS: D PTS: 1 DIF: I OBJ: ANS: D PTS: 1 DIF: I OBJ: ANS: B PTS: 1 DIF: I OBJ: ANS: C PTS: 1 DIF: I OBJ: ANS: D PTS: 1 DIF: I OBJ: ANS: A PTS: 1 DIF: I OBJ: ANS: B PTS: 1 DIF: I OBJ: ANS: C PTS: 1 DIF: II OBJ: ANS: B PTS: 1 DIF: II OBJ: ANS: C PTS: 1 DIF: I OBJ: ANS: D PTS: 1 DIF: III OBJ: ANS: B PTS: 1 DIF: III OBJ: ANS: D PTS: 1 DIF: III OBJ: ANS: B PTS: 1 DIF: II OBJ: ANS: B PTS: 1 DIF: III OBJ: ANS: D PTS: 1 DIF: L1 REF: p. 321 OBJ: STA: Ch.3.a 17. ANS: A PTS: 1 DIF: L1 REF: p ANS: C PTS: 1 DIF: L1 REF: p ANS: C PTS: 1 DIF: L1 REF: p ANS: C PTS: 1 DIF: L2 REF: p ANS: D PTS: 1 DIF: L1 REF: p. 324 p ANS: A PTS: 1 DIF: L1 REF: p. 324 p ANS: D PTS: 1 DIF: L1 REF: p. 324 p ANS: C PTS: 1 DIF: L1 REF: p. 327 p ANS: D PTS: 1 DIF: L1 REF: p ANS: B PTS: 1 DIF: L1 REF: p. 325 OBJ: ANS: B PTS: 1 DIF: L1 REF: p ANS: A PTS: 1 DIF: L1 REF: p. 325 p. 327 OBJ: STA: Ch.3.a 1
6 ID: A 29. ANS: C PTS: 1 DIF: L2 REF: p. 324 p ANS: D PTS: 1 DIF: L2 REF: p. 324 p ANS: C PTS: 1 DIF: L2 REF: p ANS: B PTS: 1 DIF: L1 REF: p. 330 OBJ: STA: Ch.3.a Ch.3.e 33. ANS: C PTS: 1 DIF: II OBJ: ANS: A PTS: 1 MATCHING 35. ANS: E PTS: 1 DIF: L1 REF: p ANS: A PTS: 1 DIF: L1 REF: p. 323 OBJ: STA: Ch.3.e 37. ANS: B PTS: 1 DIF: L1 REF: p. 323 OBJ: STA: Ch.3.e 38. ANS: C PTS: 1 DIF: L1 REF: p. 323 OBJ: STA: Ch.3.a 39. ANS: D PTS: 1 DIF: L1 REF: p. 325 OBJ: STA: Ch.3.a 2
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