Problem Set Chapter 7 With Unit v I will give less homework and fewer easy probl

Question

Problem Set Chapter 7 With Unit v I will give less homework and fewer easy problems such as definitions 1 expect you will do odd ting the homework. The represents what you will find on the exam. This is to prepare you for your courses If you have no your responsibility determine how you st and what material you need to emphasize. and been doing the to will do on the exam optional practice and problems Please provide the answers on the accompanying answer sheet, and only hand in the answer sheet, keep these questions to help you review for the exam. 1. write the appropriate word each of the underlined pairs: In an exothermic reaction, in the system gains/loses heat the surroundings 2. Which of the following represents an exothermic reaction? A) A(g) B() 20(g) C) 50 kcal 2Ale) (g) D(s) D) Both A and Bare exothermic reactions. E) Both A and Care exothermic reactions. 3. When a cold-pack is activated, achemical reaction occurs and the temperature of the contents drops sharply. Which of the following is a correct description of the reaction occurring in the pack? A) The reaction is AH >0. B) The reaction is exothermic; AHa

Explanation / Answer

(1) Exothermic reactions are the reaction which gives off energy.

SO, exothermic reactions loses energy to the surroundings.

(2)

(B) since energy is at product side, indicating release of energy during reaction

(3) (C) Endothermic, deltaH0 > 0

Since temperature is dropped, heat is absorbed, so the reaction is endothermic. For endothermic reactions deltaH is positive.

(4) (C) Entropy

Entropy is the measure the randomness of the system.

(5) (a)
Entropy of different states: Solids < Liquids < gases.

This is due to arrangement of constituent particles which influences the random motion.

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