Unit 4 Review

Which is the correct definition of a closed system?

• a system in which matter is allowed to enter or leave

• a system with a lid on it

• a system in which no matter is allowed to enter or leave

• a system that alllows exchanges of atmospheric gas

In a closed system, as energy conversions happen, the total energy _________________

• remains constant

• increases

• decreases

• doubles

This is an example of what type of system?

• open system

• closed system

• isolated system

• increasing system

When an object that is hot comes in contact with a cold object in a closed system, what is the flow of heat transfer?

• cold to hot

• cold to cold

• hot to cold

• hot to hot

Which law states, " energy can neither be created nor destroyed, it can only change forms."

• law of conservation of matter

• law of conservation of energy

• Newton's first law

• Newton's second law

What phase change is this?

• liquid to solid

• solid to liquid

• solid to gas

• gas to liquid

What type of energy is used, when water is boiled and turns from liquid to gas?

• nuclear energy

• light energy

• thermal energy

• electrical energy