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HEAT OF REACTION MCQs

Total Questions : 26 | Page 3 of 3 pages
Question 21. A change in matter in which heat is absorbed is
  1.    Endothermic
  2.    Exothermic
  3.    Absorbed
  4.    Gained
 Discuss Question
Answer: Option A. -> Endothermic
Question 22. How much heat is required to raise the temperature of a sample of copper from 10
  1.    1881 J
  2.    250. J
  3.    173 J
  4.    359 J
 Discuss Question
Answer: Option C. -> 173 J
Question 23. H2 + Cl2 → 2 HCl + 1845 kJIs this reaction endothermic or exothermic?
  1.    Endothermic 
  2.    Exothermic
 Discuss Question
Answer: Option B. -> Exothermic
Question 24. Consider the reaction: 2 H2O + energy → 2H2 + O2
  1.    exothermic, releasing energy
  2.    exothemic, absorbing energy
  3.    endothermic, absorbing energy
  4.    endothermic, releasing energy
 Discuss Question
Answer: Option C. -> endothermic, absorbing energy
Question 25. The following equation shows the combustion of heptane, C7H16, in excess oxgen
  1.    25.0 g
  2.    36.0 g
  3.    77.0 g
  4.    88.0 g
 Discuss Question
Answer: Option A. -> 25.0 g
Question 26. Why is a polystyrene cup used in the experiment to determine the heat of reaction involving two aqueous solution?
  1.    To allow the temperature of the reaction to increase uniformly
  2.    So that the reaction takes place completely
  3.    To reduce the heat loss to the surrounding
  4.    To increase the quantity of heat loss to the surrounding
 Discuss Question
Answer: Option C. -> To reduce the heat loss to the surrounding

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