Changes Around Us

Which of these is NOT a reversible change?

• Water to Ice
• Juice to Popsicle
• Cookie Dough to Cookie
• Melting Chocolate

What is a reversible change?

• Something you can change back.
• Something you cannot change back.

Changing liquid to a gas is called

• evaporation
• condensation
• melting
• freezing

What is happening in the statement below?
The ice cube melted.

• Matter is changing from a liquid to a solid.
• Matter is changing from a liquid to a gas.
• Matter is changing from a solid to a liquid.
• Matter is changing from a gas to a liquid.

When heat is added to a solid, it ______________.

• freezes
• evaporates
• melts
• condenses

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving

If we cut a paper we can stick it back then why is it an Irreversible Change ?

• Because If we keep it anywhere It looks like the original form

• The paper will turn back automatically

• It does not change exactly like before

• Wrong it is Reversible