Practicing class: Week 9 OSU, CHEM 1414 Date: Full Name: TA\'s Name: Note: This

Question

Practicing class: Week 9 OSU, CHEM 1414 Date: Full Name: TA's Name: Note: This is not a homework Practicing class_Week 9_Mar 26 1. Which of the following signs on q and w represent a system that is doing work on the surroundings, as well as losing heat to the surroundings? e. None of these represent the system referenced above 2. Which of the following signs on q and w represent the surroundings that is doing work on the system, as well as losing heat to the surroundings? e. None of these represent the system referenced above 3. Determine the final temperature of a gold nugget (mass 376 g) that starts at 39S K and loses 4.85 kJ of heat to a snowbank when it is lost. The specific heat capacity of gold is 0.128 J/g C. a. 133 K b. 398 K c. 187 K d. 297 K e. 377 K 4. An endothermic reaction has a, a negative ??, absorbs heat from the surroundings, and feels cold to the touch. b. a positive AH, gives off heat to the surroundings, and feels warm to the touch. c. a negative ??, gives off heat to the surroundings, and feels warm to the touch. d. a positive AH, absorbs heat from the surroundings, and feels cold to the touch. e. a positive AH, absorbs heat from the surroundings, and feels warm to the touch. endothermic reacion has the following. a. +?? and-AE +AH and +?? -AH and-AE c. d.

Explanation / Answer

Q1) a

condition is given in question 1 is ,system doing work on the surrounding and losing heat to the surrounding ,so we can say that work is done by system .

if work done by the system - the sign is negative(-w)

if work done on the system -the sign is positive(+w)

if energy enter the system- sign is positive (+q)

if energy leave the system - sign is negative (-q)

same ( above defined ) concept applied in Q2 so

Q2) b

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