States of Matter and Phase Changes

What are irreversible and reversible changes?

• Irreversible changes cannot be undone, while reversible changes can be reversed

• Only changes that are solid

• Only changes that are liquid

• Only changes that are gas.

A solid changes to a liquid when it is (a)   , which is an example of a reversible change.

• melting

• freezing

• evaporating

• condensing

What type of change occurs during evaporation?

• A) An irreversible change where a solid changes to a liquid

• B) A reversible change where a liquid changes to a gas

• C) An irreversible change where a gas changes to a liquid

• D) An irreversible change where a liquid changes to a solid.

Match the following phase changes with their descriptions:

• Evaporation

• Gas to liquid

• Condensation

• Liquid to gas

• Freezing

• Solid to liquid

• Melting

• Liquid to solid

Which of the following represents a reversible change?

• A) Burning paper

• B) Melting ice

• C) Cooking an egg

• D) Rusting iron

What is the property of irreversible and reversible changes?

• The amount of space an object takes up during a change

• The amount of matter involved in a change

• The color change of an object during a change

• The shape change of an object during a change.

Match the following with their examples: Solid, Liquid, Gas.

• Solid

• Milk

• Liquid

• Rock

• Gas

• Helium in a balloon

Which of the following represents an irreversible change?

• Freezing water

• Burning paper

• Melting ice

A liquid changes to a gas during (a)   . A) Freezing B) Melting C) Evaporation D) Condensation.

• Freezing

• Melting

• Evaporation
• Condensation

What are irreversible and reversible changes?

• Irreversible changes cannot be undone, while reversible changes can be.

• The amount of irreversible change in an object.

• The amount of space an object takes up during a reversible change.

• A state of matter that undergoes irreversible change.