Chem 107 Exam I1, Page 6 of 12 Oct 19, 2017 E 4358 20. (3 points) Which statemen

Question

Chem 107 Exam I1, Page 6 of 12 Oct 19, 2017 E 4358 20. (3 points) Which statement is false A. The average kinetic energies of molecules from samples of different "ideal" gases is the same at the same temperature. B. The molecules of an ideal gas are relatively far apart C. All molecules of an ideal gas have the same kinetic energy at constant temper ature walls. at the same temperature D. Molecules of a gas undergo many collisions with each other and the container E. Molecules of greater mass have a lower average speed than those of l 21. (3 points) Heat is A. a measure of temperature. B. a measure of thermal energy trannferred between two bodies at different tem- perature C. a measure of the change in temperature D. the energy stored within the structural units of chemical subetanoes E. the energy due to the movement of an object. 22. (3 points) An exothermic reaction causes the surroundings to A. warm up B. become acidic. C. expand D. decrease in temperature E. release CO 23. (3 points) How much heat is required to raise the temperature of 2500g of water from 27°C to 72°C? The specific heat of water is 4,184 J/g°C A. 470k B. 750 kJ C280 kJ D. 10kJ E. 0.19kJ 24. (3 points) Which of the following processes always results in an incresse in the energy of a system?

Explanation / Answer

20. C is wrong - All molecules of an ideal gas have the same kinetic energy at constant temperature.

Molecules follow a maxwell-boltzmann distribution which means molecules moving in different velocities have different energies.

21.heat is-

B. A measure of thermal energy transferred between two bodies at different temperature.

22. A. Warm up

As an exothermic reaction is one that releases energy

23. Q = m*c*deltaT

Q =2500g*4.184J/gC*(72-27)C

Q= 470kJ (option A)

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