Chem 1010 - General Chemistry 1 » Summer 2021 » Quiz 5 Chapter 4

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Question #1
Determine which requires more energy transfer. Specific heat of water is 4.184 jg-1 0C-1 and specific heat of aluminium is 0.900 jg-1 0C-1 a) warming 15.0 g of water from 25 0C to 30 0C or b) warming 50.0 g of aluminium from 25 0C to 30 0C
A.   aluminum q(water) = 225 J, q(aluminium) = 314 J
B.   water q(water) = 314 J, q(aluminium) = 225 J
Question #2
A 20.0 g sample of aluminum (specific heat = 0.902 J g−1 °C−1) with an initial temperature of 48.6°C is heated with 427 J of energy. What is the final temperature of the sample?
A.   23.7°C
B.   74.8°C
C.   72.3°C
D.   24.9°C
E.   26.2°C
Question #3
Determine if each of the four processes below describes positive or negative changes to the internal energy of the system. I. water absorbs heat from the surroundings and becomes steam II. steam expands and pushes against the surrounding air III. fuel molecules burn and heat the surroundings IV. air is compressed into an inner tube by an external pump
A.   negative positive positive negative
B.   negative positive negative positive
C.   positive negative positive negative
D.   positive positive negative negative
E.   positive negative negative positive
Question #4
Heating a 25.0 g sample of each substance below with 375 J of energy will cause which substance to have the greatest increase in temperature?
A.   copper (specific heat = 0.385 J g−1 °C−1)
B.   iron (specific heat = 0.451 J g−1 °C−1)
C.   Not enough information to determine.
D.   water (specific heat = 4.184 J g−1 °C−1)
E.   gold (specific heat = 0.128 J g−1 °C−1)

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