One Question per Day on Synthetic Ammonia (Series 22)
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Multiple-choice question (fill in the correct option in the brackets) Series 21, Question 106: (B-B-002) The selectivity of a chemical reaction refers to the ratio of the actual amount of product obtained to the theoretical amount that should be obtained based on the amount of reactant that reacted. (A) the sum of, (B) the difference between, (C) the product of, (D) the ratio of. 107. (B-B-003) Water vapor is one of the most common products encountered in chemical manufacturing. The enthalpy value of water at 100°C is ( ) kJ/kg. (A) 420 (B) 1,000 (C) 520 (D) 100 108. (B-B-003) The heat capacities used in chemical calculations are mostly ( ) heat capacities. (A) Constant temperature (B) Constant pressure (C) Constant volume (D) Constant pressure and constant temperature. 109. (B-B-003) The thermal conductivity of steel is 40 KCal/m·h·°C; what is its equivalent value in the International System of Units? ( ) W/m·K. (A) 46. 52 (B) 33. 48 (C) 40 (D) 160110. (B-B-004) The flow velocity of a gas with higher pressure in a tube is ( ) m/s. (A) 15～25 (B) 30～50 (C) 10～15 (D) 5～10 Answer: DABAA Scoring criteria: 3 points for participation, 8 points for a completely correct answer.
Answer: D A B A A
106. (B-B-002) The chemical reaction selectivity is expressed as the actual amount of product obtained divided by the theoretical amount (D) that should be obtained based on the amount of reactant that reacted. (A) the sum, (B) the difference, (C) the product, (D) the ratio. 107. (B-B-003) Water vapor is one of the most common products in chemical manufacturing; the enthalpy value of water at 100°C is (A) kJ/kg. (A) 420 (B) 1,000 (C) 520 (D) 100 108. (B-B-003) The heat capacities used in chemical calculations are mostly (B) heat capacities. (A) Constant temperature (B) Constant pressure (C) Constant volume (D) Constant pressure and constant temperature. 109. (B-B-003) The thermal conductivity of steel is 40 KCal/m·h·°C; its equivalent value in the International System of Units is (A) W/m·K. (A) 46. 52 (B) 33. 48 (C) 40 (D) 160 110. (B-B-004) The flow velocity of a gas with higher pressure in the tube is (D) m/s. (A) 15～25 (B) 30～50 (C) 10～15 (D) 5～10
D A B A B~~~~~~~~~~~~~
106. (B-B-002) The chemical reaction selectivity is expressed as the actual amount of product obtained divided by the theoretical amount (D) that should be obtained based on the amount of reactant that reacted. (A) the sum, (B) the difference, (C) the product, (D) the ratio. 107. (B-B-003) Water vapor is one of the most common products in chemical manufacturing; the enthalpy value of water at 100°C is (A) kJ/kg. (A) 420 (B) 1,000 (C) 520 (D) 100 108. (B-B-003) The heat capacities used in chemical calculations are mostly (D) heat capacities. (A) Constant temperature (B) Constant pressure (C) Constant volume (D) Constant pressure and constant temperature. 109. (B-B-003) The thermal conductivity of steel is 40 KCal/m·h·°C; its equivalent value in the International System of Units is (B) W/m·K. (A) 46. 52 (B) 33. 48 (C) 40 (D) 160110. (B-B-004) The flow velocity of a gas with higher pressure in the tube is (A) m/s. (A) 15～25 (B) 30～50 (C) 10～15 (D) 5～10