HEAT & TEMPERATURE

Which of the following happens when ice changes into a liquid at zero degree celsius?

• The molecules move slower than before.

• The temperature of the substance increases.

• The potential energy of the molecules increases.

• The average movement of molecules increases.

Temperature of a body measures the molecular _____.

• average kinetic energy

• average potential energy

• differences in kinetic energy

• differences in potential energy

What happens to the temperature if more heat is added to a sample of boiling water in the stove at 1atmospheric unit?

• decreases

• increases

• remains the same

• increases then decreases

Which expands the greatest when heated at the same temperature?

• gas

• solid

• liquid

• all expand equally

A substance releases heat without changing its temperature whenever it is ________.

• melting and boiling

• boiling and condensing

• melting and condensing

• freezing and condensing

Why is sand hotter than water at daytime but colder at night?

• sand is solid, while water is liquid

• sand and water have equal specific heats

• sand has a lower specific heat than water

• sand has higher specific heat than water

Which of the following is TRUE about boiling?

• It is slower than evaporation.

• It takes place at a specific temperature.

• It is the same for all liquids at the same temperature.

• It takes place when bubbles being to appear in the liquid.

During warm days, you cool yourself by damping your skin with a wet towel. Which of the following takes place?

• Wet towel has no effect on your body.

• Wet towel releases heat energy to your body.

• Wet towel absorbs heat energy from your body.

• Wet towel has the same temperature as your body.

A decrease in temperature of a substance indicates that the ________.

• volume of the substance reduces

• volume of the substance increases

• particles of the substance get closer with each other

• particles of the substance move farther from each other

What average energy of particles does temperature measure?

• kinetic

• potential

• mechanical

• chemical