lesson 4: chemical and physical changes. lab #1: elephant toothpaste h 2 o 2 h 2 o + o 2 = chemical...

UNIT 3: CHEMISTRY Lesson 4: Chemical and Physical Changes

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Page 1: Lesson 4: Chemical and Physical Changes. Lab #1: Elephant Toothpaste H 2 O 2 H 2 O + O 2 = Chemical Change Lab #2: Change in State of Matter Ice Liquid

UNIT 3: CHEMISTRYLesson 4: Chemical and Physical Changes

Page 2: Lesson 4: Chemical and Physical Changes. Lab #1: Elephant Toothpaste H 2 O 2 H 2 O + O 2 = Chemical Change Lab #2: Change in State of Matter Ice Liquid

YOU HAVE SEEN BOTH A CHEMICAL AND PHYSICAL CHANGE IN LAB ALREADY Lab #1: Elephant ToothpasteH2O2 H2O + O2 = Chemical Change

Lab #2: Change in State of MatterIce Liquid Water Water Vapor (gas)

= Physical Change

CHEMICAL CHANGE A new substance with new properties is

formed.

Leaves Changing Color Rusting Nail Wood Burning

H2O2 H2O + O2

Oxygen gas and water are new substances.

The hydrogen peroxide is gone.

Page 4: Lesson 4: Chemical and Physical Changes. Lab #1: Elephant Toothpaste H 2 O 2 H 2 O + O 2 = Chemical Change Lab #2: Change in State of Matter Ice Liquid

PHYSICAL CHANGE Matter changes phase or shape, but it is

still the same substance with the same properties.

Melting Ice Breaking Glass Dissolving Sugar in Water

Melting Ice is still water.

Ice Liquid Water Water Vapor (gas)

Page 5: Lesson 4: Chemical and Physical Changes. Lab #1: Elephant Toothpaste H 2 O 2 H 2 O + O 2 = Chemical Change Lab #2: Change in State of Matter Ice Liquid

ASK YOURSELF…

Question: Yes No

Was a new substance formed?

Chemical Physical

Have the properties of the substance changed?

Chemical Physical

Is it reversible? Physical Chemical

Can the new substance be separated back into its original parts?

Physical Chemical

Page 6: Lesson 4: Chemical and Physical Changes. Lab #1: Elephant Toothpaste H 2 O 2 H 2 O + O 2 = Chemical Change Lab #2: Change in State of Matter Ice Liquid

TODAY’S ACTIVITY Identifying Physical and Chemical

Changes worksheet

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