General Chemistry Multiple Choice Questions Chapter 8

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1 1 Write the skeleton chemical equation for the following word equation: Hydrochloric acid plus magnesium yields magnesium chloride and hydrogen gas. a HClO 4 + Mg --> MgClO 4 + H 2 b HClO 4 + Mg --> MgClO 4 + H c HCl + Mg --> MgCl 2 + H 2 d HCl + Mg --> MgCl 2 + H Write the skeleton chemical equation for the following word equation: Sodium hydroxide and hydrochloric acid react to yield sodium chloride and water. a NaOH + HCl --> NaCl + H 2 O b NaOH + HClO 4 --> NaCl + H 2 O c NaH + HCl --> NaCl + H 2 O d NaOH + HOCl --> NaCl + H 2 O Write the skeleton chemical equation for the following word equation: Ammonia plus sulfuric acid yield the ammonium ion and the hydrogen sulfate (-) ion. - - a NH 4 + H 2 SO 4 --> NH 3 + HSO 4 b NH 3 + H 2 SO 4 --> NH HSO 4 c NH 3 + HSO 4 --> NH SO 4- d NH 3 + H 2 SO 4 --> NH 4 + HSO Updated 1/4/2018 Boyceville High School, Mr. Hamm Page 1 of 9

2 2 Which of the following chemical equations is not balanced? a CaF 2 + H 2 SO 4 ---> 2HF + CaSO 4 b Ca 3 (PO 4 ) 2 + 4H 3 PO 4 ---> 3Ca(H 2 PO 4 ) c NaNO 3 + H 2 SO 4 ---> Na 2 SO 4 + 2HNO 3 d P 4 O 6 + 6H 2 O ---> 4H 3 PO 3 3 What is the coefficient in front of MnO 2 when the following equation is balanced? MnO 2 + Al ---> Mn + Al 2 O 3 a 1 b 2 c 3 d 4 19 When the equation below is balanced and the coefficients are reduced to lowest whole-number terms, what is the coefficient on H 2 O (l)? LiHCO 3 (aq) + H 2 SO 4 (aq) ---> Li 2 SO 4 (aq) + H 2 O (l) + CO 2 (g) a 1 b 2 c 3 d 4 e 5 Updated 1/4/2018 Boyceville High School, Mr. Hamm Page 2 of 9

3 17 When CH 3 NH 2 is combusted in air, all of the following are products except a H 2 (g) b H 2 O (l) 8.3 c CO 2 (g) d N 2 (g) 1 Which of the following reactions represents a decomposition reaction? a P 4 O H 2 O --> 4H 3 PO 4 b 2NaN 3 ---> 2Na + 3N c 2H 2 O + O 2 ---> 2H 2 O 2 d HCl + NaOH ---> NaCl + H 2 O 1 Which of the following represents a synthesis reaction? a H 2 SO LiOH ---> Li 2 SO H 2 O b 2NaN 3 ---> 2Na + 3N c 2H 2 O + O 2 ---> 2H 2 O 2 d HCl + NaOH ---> NaCl + H 2 O Updated 1/4/2018 Boyceville High School, Mr. Hamm Page 3 of 9

4 12 Copper does not react with hydrochloric acid wheras manganese does. This means that a Copper is more active than hydrogen b Manganese is less active than hydrogen c Chloride ion will react with copper d Manganese is higher in the activity series than copper 13 Which of the following metals cannot displace hydrogen from water (steam or liquid)? a Mg b K c Li d Ag 14 Use the activity series to predict which of the following reactions will occur. a Cu (s) + 2AgNO 3 (aq) ---> Cu(NO 3 ) 2 (aq) + 2Ag (s) b 3Fe (s) + Al 2 (SO 4 ) 3 (aq) ---> 2Al (s) + 3FeSO 4 (aq) c H 2 (g) + LiOH (aq) ---> 2Li (s) + 2H 2 O (l) d Cu (s) + ZnSO 4 (aq) ---> Zn (s) + CuSO 4 (aq) ml of a M aqueous solution of magnesium chloride is added to ml of a M aqueous solution of NaOH. A fine white solid substance is observed. Which substance is the white substance? a MgCl 2 b Mg(OH) 2 c NaCl d NaOH 11 When a strong acid reacts with an active metal, which of the following is formed? a H 2 (g) b H 2 O (l) c An element of the acid d Another acid Updated 1/4/2018 Boyceville High School, Mr. Hamm Page 4 of 9

5 18 In the reaction below, what mass of HF is produced by the reaction of 3.0 x molecules of H 2 with excess F 2 assuming the reaction goes to completion? H 2 + F 2 ---> 2 HF 8.5 a 1.0 g b 4.0 g c 10. g d 20. g e 40. g 1 Consider the following reaction. How many grams of O 2 are needed for the complete reaction of 162 g of NH 3? 4 NH O 2 --> 4 NO + 6 H 2 O a 108 g b 381 g c 244 g d 202 g 2 How many moles of H 2 O are requred to react with moles of N 2? 2 N H 2 O --> 4 NH O 2 a 2.40 moles b 1.00 moles c 1.56 moles d moles Updated 1/4/2018 Boyceville High School, Mr. Hamm Page 5 of 9

6 1 If 5.0 g of each reactant are used for the following process, what compound is the limiting reactant? 2 KMNO Hg 2 Cl HCl --> 10 HgCl MnCl KCl + 8 H 2 O a KMnO 4 b HCl c Hg 2 Cl 2 d H 2 O 2 What mass of ZnCl 2 can be prepared from the reaction of 3.27 grams of zinc and 3.30 grams of HCl? Zn + 2 HCl --> ZnCl 2 + HCl a 6.89 g b 6.82 g c 6.46 g d 6.17 g 3 How many grams of NH 3 can be prepared from 77.3 grams of N 2 and 14.2 grams of H 2? HINT: Write and balance the synthesis reaction first a 93.9 g b 79.7 g c 47.0 g d g Updated 1/4/2018 Boyceville High School, Mr. Hamm Page 6 of 9

7 4 What is the mass of Cu produced if 10.0 g of Cu 2 S reacts with 16.0 g of O 2 as follows: Cu 2 S + O 2 ---> 2Cu + SO 2 a 31.8 g b 63.5 g c 3.99 g d 7.98 g 5 What is the percent yield if 25.0 g of I 2 is formed when g of HNO 3 reacts with g of HI as follows: 2HNO 3 + 6HI ---> 2NO + 3I 2 + 4H 2 O a 27.2% b 17.6% c 4% d 4.42% 6 How many moles of KClO 3 are required to produce 2.51 g of O 2? 2KClO 3 ---> 2KCl + 3O a 1.18 x 10-1 mol b 5.23 x 10-2 mol c 2.35 x 10-1 mol d 1.57 x 10-2 mol 20 A 6.0 mol sample of C 3 H 8 (g) and a 20. mol sample of Cl 2 (g) are placed in a previously evacuated vessel where they react according to the equation below. After one of the reactions has been totally consumed, how many moles of HCl (g) have been produced? C 3 H 8 (g) + 4 Cl 2 (g) ---> C 3 H 4 Cl 4 (g) + 4 HCl (g) a 4.0 mol b 8.0 mol c 20. mol d 24 mol 8.7 Updated 1/4/2018 Boyceville High School, Mr. Hamm Page 7 of 9

8 7 What are the spectator ions in the reaction BaCl 2 (aq) + Na 2 SO 4 (aq) ---> 2NaCl (aq) + BaSO 4 (s) a Ba 2+, Cl - b Na +, Cl - c Ba 2+ 2-, SO 4 d Na + 2-, SO 4 8 Which of the following is the net ionic equation for the reaction Fe(NO 3 ) 3 (aq) + K 3 PO 4 (aq) ---> FePO 4 (s) + 3KNO 3 (aq) a K + (aq) + NO 3 - (aq) ---> KNO 3 (aq) b Fe 3+ (aq) + PO 4 3- c 3K + (aq) + PO 4 3- (aq) ---> K 3 PO 4 (aq) d Fe 3+ (aq) + PO 4 3- (aq) ---> FePO 4 (aq) (aq) ---> FePO 4 (s) 9 What is the net ionic equation for the reaction between Cu(NO 3 ) 2 (aq) and NaOH (aq)? a No reaction b Na + (aq) + NO 3 - (aq) ---> NaNO 3 (s) c Cu 2+ (aq) + 2OH - (aq) ---> Cu(OH) 2 (s) d Cu 2+ (aq) + 2NO 3 - (aq) ---> Cu(NO 3 ) 2 (s) 10 What is the net ionic equation for the reaction between Pb(NO 3 ) 2 (aq) and CaCl 2 (aq)? a No reaction b Pb 2+ (aq) + 2Cl - (aq) ---> PbCl 2 (s) c Pb 2+ - (aq) + 2NO 3 (aq) ---> Pb(NO 3 ) 2 (s) d Ca 2+ - (aq) + 2NO 3 (aq) ---> Ca(NO 3 ) 2 (s) ml of a M aqueous solution of magnesium chloride is added to ml of a M aqueous solution of NaOH. A fine white solid substance is observed. What is the net ionic equation for the reaction? a b Mg 2+ (aq) + 2OH - (aq) + 2Cl - (aq) + 2Na + (aq) ---> Mg(OH) 2 (s) + 2NaCl (s) Mg 2+ (aq) + 2OH - (aq) ---> Mg(OH) 2 (s) c d 2Cl - (aq) + 2Na + (aq) ---> 2NaCl (s) Mg 2+ (aq) + 2OH - (aq) + 2Cl - (aq) + 2Na + (aq) ---> Mg(OH) 2 (s) + 2NaCl (aq) Updated 1/4/2018 Boyceville High School, Mr. Hamm Page 8 of 9

9 1 Determine whether the following reaction is exothermic, endothermic, or neither: CH 4 (g) + O 2 (g) --> CO 2 (g) + H 2 O (g) kcal a Exothermic b Endothermic c Thermodynamically Neutral d Cannot be determined 2 Determine whether the following reaction is exothermic, endothermic, or neither: N 2 (g) + O 2 (g) + 43 kcal --> 2 NO (g) a Exothermic b Endothermic c Thermodynamically Neutral d Cannot be determined 3 Determine whether the following reaction is exothermic, endothermic, or neither: 2 H 2 (g) + O 2 (g) --> 2 H 2 O (g) DH = J a Exothermic b Endothermic c Thermodynamically Neutral d Cannot be determined Updated 1/4/2018 Boyceville High School, Mr. Hamm Page 9 of 9

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