Ramsay Test Thermodynamics 5

Question 1

What happens to most substances when they are heated?

Accepted Answer

They expand

Answer

Most materials expand as heating increases molecular motion and spacing.

Question 2

In which direction does heat naturally flow between two objects in contact?

Accepted Answer

From hot to cold

Answer

Heat spontaneously flows from a higher temperature to a lower temperature.

Question 3

What is the energy associated with the total molecular motion of a substance called?

Accepted Answer

Internal energy

Answer

Internal energy is the sum of the kinetic and potential energy of the molecules.

Question 4

A surface that is a good emitter of radiant heat is typically what color?

Accepted Answer

Dull black

Answer

Dull black surfaces are the best emitters and absorbers of thermal radiation.

Question 5

What is enthalpy a measure of in a thermodynamic system?

Accepted Answer

Total heat content at constant pressure

Answer

Enthalpy represents the total heat content of a system at constant pressure.

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