Chem A Ch. 9 Practice Test

Transcription

1 Name: Class: Date: Chem A Ch. 9 Practice Test Matching Match each item with the correct statement below. a. product d. balanced equation b. reactant e. skeleton equation c. chemical equation 1. a new substance formed in a chemical reaction 2. a starting substance in a chemical reaction 3. a concise representation of a chemical reaction 4. an equation in which each side has the same number of atoms of each element Match each item with the correct statement below. a. activity series of metals c. combustion reaction b. single-replacement reaction d. decomposition reaction 5. a reaction in which a single compound is broken down into simpler substances 6. a reaction in which oxygen reacts with another substance, often producing heat or light 7. a reaction in which the atoms of one element replace the atoms of a second element in a compound Multiple Choice Identify the choice that best completes the statement or answers the question. 8. In writing an equation that produces hydrogen gas, the correct representation of hydrogen gas is a. H. c. H 2. b. 2H. d. OH. 9. 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 10. 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. 11. According to the law of conservation of mass, the total mass of the reacting substances is a. always more than the total mass of the products. b. always less than the total mass of the products. c. sometimes more and sometimes less than the total mass of the products. d. always equal to the total mass of the products. 1

2 Name: 12. 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. 13. Which word equation represents the reaction that produces water from hydrogen and oxygen? a. Water is produced from hydrogen and oxygen. b. Hydrogen plus oxygen yields water. c. H 2 + O 2 water. d. Water can be separated into hydrogen and oxygen. 14. 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 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 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 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 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? a. 2, 1, 2 c. 1, 2, 1 b. 1, 2, 3 d. 1, 1, Which equation is NOT balanced? a. 2H 2 + O 2 2H 2 O b. 4H 2 + 2O 2 4H 2 O c. H 2 + H 2 + O 2 H 2 O + H 2 O d. 2H 2 + O 2 H 2 O 21. In what kind of reaction do two or more substances combine to form a new compound? a. decomposition reaction c. double-replacement reaction b. ionic reaction d. synthesis reaction 2

3 Name: 22. The equation AX A + X is the general equation for a a. synthesis reaction. c. combustion reaction. b. decomposition reaction. d. single-replacement reaction. 23. In what kind of reaction does one element replace a similar element in a compound? a. single-replacement reaction c. decomposition reaction b. double-replacement reaction d. ionic reaction 24. The equation AX + BY AY + BX is the general equation for a a. synthesis reaction. c. single-replacement reaction. b. decomposition reaction. d. double-replacement reaction. 25. The equation A + X AX is the general equation for a(n) a. combustion reaction. c. synthesis reaction. b. ionic reaction. d. double-replacement reaction. 26. In what kind of reaction does a single compound produce two or more simpler substances? a. decomposition reaction c. single-replacement reaction b. synthesis reaction d. ionic reaction 27. The equation A + BX AX + B is the general equation for a a. double-replacement reaction. c. single-replacement reaction. b. decomposition reaction. d. combustion reaction. 28. The reaction 2Mg(s) + O 2 (g) 2MgO(s) is a a. synthesis reaction. c. single-replacement reaction. b. decomposition reaction. d. double-replacement reaction. 29. The reaction Mg(s) + 2HCl(aq) H 2 (g) + MgCl 2 (aq) is a a. composition reaction. c. single-replacement reaction. b. decomposition reaction. d. double-replacement reaction. 30. The reaction 2HgO(s) 2Hg(l) + O 2 (g) is a(n) a. single-replacement reaction. c. ionic reaction. b. synthesis reaction. d. decomposition reaction. 31. The reaction Pb(NO 3 (aq) + 2KI(aq) PbI 2 (s) + 2KNO 3 (aq) is a a. double-replacement reaction. c. decomposition reaction. b. synthesis reaction. d. combustion reaction. 32. The reaction Cl 2 (g) + 2KBr(aq) 2KCl(aq) + Br 2 (l) is a(n) a. synthesis reaction. c. single-replacement reaction. b. ionic reaction. d. combustion reaction. 33. In the equation 2Al(s) + 3Fe(NO 3 (aq) 3Fe(s) + 2Al(NO 3 ) 3 (aq), iron has been replaced by a. nitrate. c. aluminum. b. water. d. nitrogen. 3

4 Name: 34. 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. 35. A solid produced by a chemical reaction in solution that separates from the solution is called a. a precipitate. c. a molecule. b. a reactant. d. the mass of the product. 36. In an equation, the symbol for a substance in water solution is followed by a. (1). c. (aq). b. (g). d. (s). 37. 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. 38. In what kind of reaction do the ions of two compounds exchange places in aqueous solution to form two new compounds? a. synthesis reaction c. decomposition reaction b. double-replacement reaction d. combustion reaction 39. The decomposition of a substance by an electric current is called a. electrolysis. c. ionization. b. conduction. d. transformation. 40. Predict the product of the following reaction: MgO + CO 2 a. MgCO 3 c. MgC + O 3 b. Mg + CO 3 d. MgCO 2 + O 41. Magnesium hydroxide decomposes to yield magnesium oxide and a. hydrogen. c. water. b. oxygen. d. salt. 42. The formulas for the products of the reaction between sodium hydroxide and sulfuric acid are a. Na 2 SO 4 and H 2 O. c. SI 4 and Na 2 O. b. NaSO 4 and H 2 O. d. S + O 2 and Na. 43. What is the balanced equation when aluminum reacts with copper(ii) sulfate? a. Al + Cu 2 S Al 2 S + Cu c. Al + CuSO 4 AlSO 4 + Cu b. 2Al + 3CuSO 4 Al 2 (SO 4 ) 3 + 3Cu d. 2Al + Cu 2 SO 4 Al 2 SO 4 + 2Cu 44. The ability of an element to react is the element's a. valence. c. stability. b. activity. d. electronegativity. 4

5 Name: 45. An element in the activity series can replace any element a. in the periodic table. c. above it on the list. b. below it on the list. d. in its group. 46. What can be predicted by using an activity series? a. whether a certain chemical reaction will occur b. the amount of energy released by a chemical reaction c. the electronegativity values of elements d. the melting points of elements 47. Magnesium bromide + chlorine yield a. Mg and BrCl. c. MgBrCl. b. MgCl and Br 2. d. Mg(Cl and Br 2. Short Answer 48. Balance the following equation. Mg + H 3 PO 4 Mg 3 (PO 4 + H Balance the following equation. Au 2 O 3 Au + O Balance the following equation. Na 3 PO 4 + ZnSO 4 Na 2 SO 4 + Zn 3 (PO Complete and balance the following equation. Cd(NO 3 + NH 4 Cl 52. Balance the following equation. NaClO 3 NaCl + O 2 5

6 Name: 53. Balance the following equation. (NH 4 CO 3 + NaOH Na 2 CO 3 + NH 3 + H 2 O 54. Balance the following equation. C 3 H 6 + O 2 CO + H 2 O 55. Complete and balance the following equation. Al + Cl Complete and balance the following equation. CH 4 + O 2 CO Complete and balance the following equation. Fe 2 (SO 4 ) 3 + Ba(OH 58. Complete and balance the following equation: K 3 PO 4 + BaCl 2 Essay 59. What determines whether one metal will replace another metal from a compound in a single-replacement reaction?. 60. Predict the precipitate that forms when aqueous solutions of silver nitrate and potassium chloride react to form products in a double-replacement reaction. Include a discussion of how to write the complete chemical equation describing this reaction. 6