AP Chemistry Multiple Choice Questions - Chapter 4

Transcription

1 1 Which of the following contains 6.00 x atoms? a 6.00 x H 2 O molecules b 3.00 x Cl 2 molecules c 2.00 x P 4 molecules d 1.50 x CaSO 4 empirical units How many atoms are there in g of P 4? a x atoms b x atoms c x atoms d x atoms 7 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 9 In the reaction below, what is the total number of moles of reactants consumed with 1.00 mol of CO 2 (g) is produced? C 3 H 8 (g) + 5O 2 (g) ---> 3CO 2 (g) + 4H 2 O (l) 4.1 a 0.33 mol b 1.33 mol c 1.50 mol d 2.00 mol e 6.00 mol 10 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 4.1 a 1.0 g b 4.0 g c 10. g d 20. g e 40. g Updated 10/26/2017 Boyceville High School, Mr. Hamm Page 1 of 10

2 5 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 2 Given the following reaction: Cu (s) + AgNO 3 --> Cu(NO 3 ) 2 + Ag How many grams of Ag will be produced from 19.0 g of Cu and 125 g of AgNO 3? Be sure to balance the equation first! a 79.4 g b 52.5 g c 6 g d 85.1 g 3 Given the following reaction: C 3 H 8 + O 2 --> CO 2 + H 2 O How many grams of carbon dioxide are produced from 7.00 g of C 3 H 8 and 98.0 g of O 2? a 21.0 g b 44.3 g c 80.1 g d 35.2 g Updated 10/26/2017 Boyceville High School, Mr. Hamm Page 2 of 10

3 6 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 8.84% d 4.42% 2 What is the percent yield if 4.98 g of AlCl 3 is created by the reaction of 2.80 g of Al and 4.25 g of Cl 2? Al (s) + Cl 2 (g) --> AlCl 3 (s) a 52.5% b 93.6% c 72.3% d 82.5% 3 What is the percent yield if 1.82 g of AgCl is created by the reaction of 1.56 g of BaCl 2 and 25.5 g AgNO 3? BaCl 2 + AgNO 3 --> Ba(NO 3 ) 2 + AgCl a 92.5% b 71.8% c 78.2% d 84.6% Updated 10/26/2017 Boyceville High School, Mr. Hamm Page 3 of 10

4 1 If 50. ml of 1.0 M NaOH is diluted with distilled water to a volume of 2.0 L, the concentration of the resulting solution is a M b M c 0.10 M d 0.50 M e 1.0 M 2 How much of a 6.0 M HCl solution is needed to make 1.0 L of a 1.0 M HCl solution? a 150 ml b 160 ml c 170 ml d 180 ml 3 What is the molarity of a NaNO 3 solution if 25.0 ml of a M solution is diluted to ml? a M b M c M d M 4 What is the molarity of a solution that contains 32.0 g of HCl in 2.50 L of solution? a M b M c M d 12.8 M 5 How many moles of H 2 SO 4 are present in 250 ml of a 3.00 M H 2 SO 4 solution? a moles b moles c 1.50 moles d 7.50 moles 6 What is the molarity of a solution of g of methanol, CH 3 OH, in 250 ml of water? a M b M c 8.91 M d 12.5 M 7 A 0.20 mol sample of MgCl 2 (s) and a 0.10 mol sample of KCl (s) are dissolved in water and diluted to 500 ml. What is the concentration of Cl - in the solution? a 0.15 M b 0.30 M c 0.50 M d 0.60 M e 1.0 M Updated 10/26/2017 Boyceville High School, Mr. Hamm Page 4 of 10

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6 1 What is the ph of a 0.25 M HBr solution? a b 0.25 c d What is the ph of a M Ba(OH) 2 solution? a 1.22 b c 1.52 d What is the ph of a 0.25 M HBr solution? a b 0.25 c d What is the ph of a M Ba(OH) 2 solution? a 1.22 b c 1.52 d The ph of a HCl solution is What is [H + ]? a 0.46 M b 5.67 x 10-2 M 4.6 c 1.35 x 10-3 M d M Updated 10/26/2017 Boyceville High School, Mr. Hamm Page 6 of 10

7 13 How many milliliters of 1.00 M NaNO 3 are required to completely neutralize ml of M H 3 PO 4? a 50.0 ml b ml c ml d ml 14 What is the molarity of a NaNO 3 solution if 25.0 ml of a M solution is diluted to ml? a M b M c M d M 15 What is the molarity of a solution that contains 32.0 g of HCl in 2.50 L of solution? a M b M c M d 12.8 M 16 How many moles of H 2 SO 4 are present in 250 ml of a 3.00 M H 2 SO 4 solution? a moles b moles c 1.50 moles d 7.50 moles 20 What is the mole fraction of NaCl in a solution containing 20.2 g of NaCl and 55.0 g of water? a b c d Updated 10/26/2017 Boyceville High School, Mr. Hamm Page 7 of 10

8 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. How many moles of the white substance form? a b c d Permanganate and oxalate ions react in an acidified solution according to the balanced equation below. How many moles of CO 2 (g) are produced when 20. ml of acidified 0.20 M KMNO 4 solution is added to 50. ml of 0.10 M Na 2 C 2 O 4 solution? 2MnO 4 - (aq) + 5C 2 O 4 2- (aq) + 16H + (aq) ---> 2Mn 2+ (aq) + 10CO 2 (g) + 8H 2 O (l) a mol b mol c mol d mol e mol 23 The percentage of silver in a solid sample is determined gravimetrically by converting the silver to Ag + (aq) and precipitating it as silver chloride. Failure to do which of the following could cause errors in analysis? I. Account for the mass of the weighing paper when determining the mass of the sample II. Measure the temperature during the precipitation reaction III. Wash the precipitate IV. Heat the AgCl precipitate to constant mass a I only b I and II c I and IV d II and III e I, III, and IV 8 A 0.20 mol sample of MgCl 2 (s) and a 0.10 mol sample of KCl (s) are dissolved in water and diluted to 500 ml. What is the concentration of Cl - in the solution? a 0.15 M b 0.30 M c 0.50 M d 0.60 M e 1.0 M Updated 10/26/2017 Boyceville High School, Mr. Hamm Page 8 of 10

9 12 A student prepares a solution by dissolving g of glucose (M = g/mol) in enough distilled water to make a ml of solution. The molarity of the solution should be reported as a M b 12.0 M c M d 1.33 M e 1.3 M Updated 10/26/2017 Boyceville High School, Mr. Hamm Page 9 of 10

10 1 A copper (II) sulfate solution of unknown concentration is placed in a colorimeter and an absorbance reading of 0.46 is recorded. Using the same solution cell, a M solution of copper (II) sulfate gives an absorbance reading of What is the concentration of the unknown solution? a M b 0.35 M c M d M A copper (II) sulfate solution of unknown concentration is placed in a colorimeter and an absorbance reading of 0.82 is recorded. Using the same solution cell, a 0.95 M solution of copper (II) sulfate gives an absorbance reading of What is the concentration of the unknown solution? a 0.82 M b 1.42 M c 0.98 M d 1.98 M Aqueous KMnO 4 solutions are purple. A Beer's law graph of absorbance vs. concentration would be a Exponential growth b Linear with a positive slope c Exponential decay d Linear with a negative slope 4.8 Updated 10/26/2017 Boyceville High School, Mr. Hamm Page 10 of 10