A 100 g piece of metal, initially at 85 degree C is put (without heat loss or ga
ID: 509431 • Letter: A
Question
A 100 g piece of metal, initially at 85 degree C is put (without heat loss or gain) into a cup with 50 g of water, initially at 22 degree C. Which of the following is true (select all that apply)? For the incorrect statements, explain why they are wrong. a. The temperature of the metal decreases and that of the water increases. b. The temperature change of the metal is equal but opposite that of the water. c. Q for the metal is equal but opposite that of the water. d. The heat capacity of the water is positive and that of the metal is negative.Explanation / Answer
(a) TRUE - when they both come into contact, they reach to equilibirum temperature during which heat is transfered fro high temperature metal to low temperature water. So, temperature of metal decreases and water increases.
(b) FALSE - temperature change depends on the specific heat of the substances. In general specific heat of metals is lower than that of water. SO, temperature change of metal is more than that of water.
(c) TRUE - Heat lost by metal is equal to the heat gained by water.
(d) FALSE - heat capacity of every substance is positive.
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