7.4.5- Heat Transfer Review

Heat is...

• The transfer of thermal energy from one object to another

• The amount of heat present in an object

• Solid, liquid, and gas

Temperature is...

• A form of heat transfer where energy is radiated in the form of rays

• A form of energy contained in an object associated with the motion of molecules

• A measure of the amount of heat in an object

Which picture in the diagram shows a liquid?

• 1 because the molecules are tightly packed together

• 2 because the molecules are slightly spread out

• 3 because the molecules are far apart and moving in many directions

Which state(s) of matter have a fixed volume?

• 1,2, & 3

• 1 & 2

• 1 only

When a material is heated…

• The molecules lose kinetic energy

• The molecules in the substance will be grouped more closely

• The thermal energy of the substance will be increased

Cassandra notices that when she breathes on a cool window, the water vapor in her breath forms liquid water. What happens to turn the water vapor in her breath into liquid water?

• Heat is added to the water vapor from the surrounding air.

• The temperature of the water vapor increases as it leaves her body.

• The water molecules become more spread apart as they touch the window.

• Heat leaves the water vapor as it touches the cool window.

True or false: to freeze water, coldness is added to the substance.

• True- adding cold will cause liquid water to freeze

• False- "coldness" is never added or removed, only heat

When two things are the same temperature:

• They have the same number of molecules

• Their molecules stop moving

• Their molecules move at the same average speed

• Heat transfer between the two things stops

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4