3. CHOOSE THE CORRECT ANSWER

a cube of ice is added to some hot water in a rigid, insulated container, which is then sealed. There is no heat exchange with the surroundings. What has happened to the total energy and the total entropy when the system reaches equilibrium?

Energy remains constant and entropy remains constant

a system does no work even when heat is added to it. Which of the following may happen to the system?

Internal energy of system increases

A block of steel with a mass of 1kg is at a temperature of 60°C (Csteel= 450J/kg/°C). it is placed in contact with an identical block of steel at a temperature of 20°C. the heat energy of the combined system in Joules will change by

18000

the first law of thermodynamics states that

energy is neither created nor destroyed

the energy of random molecular motion is called

heat

Electric potential if defined as the potential energy of a positive test charge divided by

magnitude of charge

the second law of thermodynamics states that

the entropy of the universe is continually increasing

the conclusion that it is impossible to completely convert heat into word without making other changes in the universe is

the second law of thermodynamics

the normal internal temperature of our bodies is 37°C. What is this temperature when expressed in units of Kelvins to the nearest power of 10?

310

If 5J of energy is added to a system that does no external work, by how much will the internal energy of that system be raised?

5J

the internal energy change in a system that has absorbed 2 kcals of heat and done 500J of work is

7900J

a gas is enclosed in a metal container with a moveable piston on top. Heat is added to the has by placing a candle flame in contact with the container's bottom. Which of the following is true about the temperature of the gas?

The temperature will go up no matter what happens to the piston

the first law of thermodynamics states that energy is

conserved during any process

If a particular amount of charge dq is transported against an electric force, then the electric work done is?

dW=ϥdq

For and isolated system, the change in internal energy according to the 1st law of thermodynamics is

ΔU=0