States Of Matter, Heat, Phase Changes Worksheet (Page 5 of 5) in pdf

39. The diagram to the right shows the heating of an unknown

substance.

(It is NOT water). Its melting point is_______.

a. between 35⁰C and 70⁰C

b. 70⁰C

c. between 70⁰C and 140⁰C

d. 140⁰C

40. In a cup of liquid water, when would the water molecules stop

moving?

A. The molecules would stop moving if the liquid water in the

cup became a solid.

B. The molecules would stop moving if the liquid water in the cup became a gas.

C. The molecules would stop moving if the liquid water in the cup became still.

D. The molecules would not stop moving in the cup of liquid water.

41. Why does liquid water take the shape of a cup it is poured into, but solid ice cubes do not?

A. Because the molecules of liquid water are softer than the molecules of solid ice

B. Because the molecules of liquid water are smaller than the molecules of solid ice

C. Because the molecules of liquid water are moving but the molecules of solid ice are not

D. Because the molecules of liquid water can easily move past one another but the molecules of solid ice cannot

42. When a substance changes from a liquid to a solid, which of the following is TRUE?

A. The molecules of the substance get heavier.

B. The molecules of the substance change shape.

C. The molecules of the substance change from soft to hard.

D. The molecules of the substance connect more strongly to one another.

43. In which state(s) of matter could a substance have thermal energy?

A. Only liquids

B. Only liquids and solids

C. Only liquids and gases

D. Liquids, solids, and gases

44. A student has two identical glasses of milk except that the temperature of the milk in one glass is 40ºF and the

temperature of the milk in the other glass is 80ºF.

The milk at which temperature has more thermal energy?

A. The milk at 40ºF has more thermal energy.

B. The milk at 80ºF has more thermal energy.

C. Both the milk at 40ºF and the milk at 80ºF have the same amount of thermal

energy.

D. Neither the milk at 40ºF nor the milk at 80ºF has any thermal energy.

45. Which of the following has thermal energy?

A. Both a piece of metal that feels hot and a piece of metal that feels cold

B. A piece of metal that feels hot but not a piece of metal that feels cold

C. A piece of metal that feels cold but not a piece of metal that feels hot

D. Neither a piece of metal that feels hot nor a piece of metal that feels cold

States Of Matter, Heat, Phase Changes Worksheet Page 5