Unit 2 Lesson 3: Physical and Chemical Changes

What does it mean when there is a physical change?

• A. Matter has changed from one substance into another.
• B. Matter has changed on the molecular level.
• C. A new substance has been formed.
• D. Matter has changed size, shape or form (appearance).

Which phrase most accurately describes a chemical change?

• A. A change on the molecular level
• B. A change in appearance
• C. A change in taste
• D. A change in form

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Which is an example of a Chemical Change?

• A. Tearing a piece of paper in half
• B A piece of wood burns to form ash.
• C An ice cube melts
• D A can is crushed

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Which is an example of a Physical Change?

• A. Water freezing into ice.
• B. A piece of wood burning.
• C. A toy car rusting.
• D. Zinc producing hydrogen gas when mixed with water.

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What type of change has occurred when a nail rusts?  

• Physical Change

• Chemical Change

• Atomic Change

• Reactive Change

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What is an example of a chemical change that happens inside your body?  

• Food being broken down by enzymes in your stomach

• Food being broken into small pieces by your teeth

• Food being moved from your esophagus into your stomach

• Water being absorbed inside your large intestine

What is an example of a physical change that happens inside your body?  

• Food being broken down by enzymes in your stomach

• Food being broken into small pieces by your teeth

• Food being moved from your esophagus into your stomach

• Water being absorbed inside your large intestine

What can you infer about the changes that formed the Grand Canyon?   

• They were molecular changes

• They were chemical changes

• They were physical changes

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How does rust form?

• Through paint flaking off of a metal surface

• Through a chemical reaction between iron and oxygen

• Through weathering

• Through the physical mixing of iron and water

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What happens when sodium undergoes a chemical reaction with chlorine? NaCl

• The two substances form a heterogeneous mixture

• The two substances form a homogenous mixture

• A new compound is formed — salt

• The two substances undergo various physical changes

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