Lab: Calorimetry and Specific Heat — Unit test Answers
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The temperature of a gas is increased. Which statement best explains the effect that this has on the motion of gas particles?
A
The average kinetic energy decreases, and the particles stop colliding.B
The average kinetic energy increases, and the particles stop colliding.C
The average kinetic energy decreases, and the particles collide less frequently.D
The average kinetic energy increases, and the particles collide more frequently.22
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Manganese dioxide (MnO2(s), Hf = –520.0 kJ) reacts with aluminum to form aluminum oxide (AI2O3(s), Hf = –1699.8 kJ/mol) and manganese according to the equation below.What is the enthalpy of the reaction? Use .
A
–1,839.6 kJB
–1,179.8 kJC
1,179.8 kJD
1,839.6 kJ23
An ice cube is placed on a kitchen counter. Which best describes heat flow in this situation?
A
Heat flows from the ice to the counter, causing the molecules in the counter to move more quickly.B
Heat flows from the ice to the counter, causing the molecules in the counter to move more slowly.C
Heat flows from the counter to the ice, causing the molecules in the counter to move more quickly.D
Heat flows from the counter to the ice, causing the molecules in the counter to move more slowly.24
What is thermal energy?
A
the average overall volume of a systemB
the total number of molecules in a systemC
the kinetic energy of particles in a systemD
the measure of temperature in a system25
What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied?Use .
A
0.00420 J/(gi°C)B
0.00661 J/(gi°C)C
238 J/(gi°C)D
252 J/(gi°C)Did you find these answers helpful?
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