Physical and Chemical Changes

Essential Question:

How can changes in matter be described?

Topic: Change in matter

Open Ended

Give an example of physical change.

Multiple Choice

Is melting butter for popcorn a chemical or physical change?

• physical

• chemical

Multiple Choice

Is cooking egg a physical or chemical change?

• Physical

• Chemical

• Not sure

Multiple Choice

Which of the following is NOT an example of a physical change?

• crumpled paper

• shrunken clothing

• pencil sharpening

• rust

Multiple Choice

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

• change in shape

• melting

• formation of gas

• dissolving

Multiple Choice

Freezing juice

• physical

• chemical

Multiple Choice

A change where one or more new substances are created.

• physical

• chemical

Multiple Choice

Dissolving sugar in water is an example of a

• physical

• chemical

What are the two types of Temperature Change?

• Exothermic

• Endothermic

What happens in an exothermic change?

• When a reaction makes and releases its own heat, that’s called an exothermic reaction.  

• You’ll know it makes its own heat because it will feel hot to you!

Some examples of exothermic.....

Releases heat: EXO--------> out

What happens in an endothermic change?

• When a reaction absorbs heat from the surroundings, it’s called an endothermic reaction.  

• You’ll know it’s absorbing heat because it feels cold to you!

Example of endothermic.......

You’ll know it’s absorbing heat because it feels cold to you!

Multiple Choice

In an exothermic reaction, heat is ...

• released

• absorbed

• no change

Multiple Choice

in an endothermic reaction heat/energy is ___________

• released

• absorbed

Multiple Choice

Baking bread and cooking an egg are examples of....?

• exothermic

• endothermic