1. Chemical and Physical Reactions

2. Write out a list of your ideas on this slide.
Teacher directs students to write a list of their own on their slide notes. Have them share their lists with each other before sharing them out.
When we talk about reactions in science what does that make you think of?

3. Reaction A reaction is when______ _____________________
____________________.
A reaction is when two or more molecules or atoms interact and something happens.

4. There are two kinds of reactions, chemical and physical.
Let’s see if we can figure out which is which.
Chemical and Physical

5. Chemical or Physical Change?
Crushing a can
Baking a Cake
Freezing water to make ice
Cutting Paper
Mixing paint to make a new colour
Physical
Chemical
Physical
Teacher has students read slide and guess what kind of reaction it is.
Physical
Chemical

6. Compare Physical Chemical 1. 2. 3. 4. 5.
Teacher asks: What did you notice about physical reactions? What did you notice about chemical reactions? Work with your table group and make a list of each one. Have them work for a few minutes and then students share out ideas. Write or type ideas into power point slide.
Compare

7. Are the formation of a new substance and they tend to be irreversible.
Color change
Release of gas
Temperature change
Turns cloudy
Change of ph
Teacher asks: How does this definition compare to your list of characteristics?
Chemical Changes

8. Physical Changes
They do not result in a new substance and are reversible.
Melting and freezing
Boiling and condensation
Forming a separable mixture
Teacher asks: How do these notes compare with the list of characteristics you made?

9. Make a T-Chart of Physical and Chemical Reactions
Making toast
Boiling an egg
A light bulb getting hot
Boiling water
Adding sugar to a cup of tea
Food going moldy
Setting off a firework
Treating wasp and bee stings
Diluting orange juice with water
Tell students they will work with a partner to create a T-Chart of examples of chemical and physical reactions. Have students first sort pictures into two categories of the T-Chart. Teacher circulates and approves or asks students to think again about their answers. Students paste their answers to their T-Chart when they get approval from teacher. Come back as a class and review answers.
24/04/2017

10. Exit Ticket: Chemical or Physical?
1. Bottle Breaking
_________________
Burning Paper
Puddle Evaporating
___________________
Boiling Water
Print this slide out separately for an exit ticket.
Is a rusty car a physical or chemical reaction? What characteristic make it a physical or chemical reaction?
____________________________________________