Chemical vs Physical Reactions

The end results of a chemical reaction are called

• products

• reactants

• explosion

• a pile of goo

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The substances that go into a chemical reaction are called

• reactants

• products

• molecules

• mixtures

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What is a chemical change?

• When you mix two substances

• The change of physical properties

• When molecules react with each other and form a new molecules

• When a solid turns into a liquid

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This image shows what happens when methane gas (CH₄) is burned (reacts with oxygen O₂) to produce carbon dioxide and water. Which of the following is a product?

• methane (CH₄)

• oxygen (O₂)

• carbon dioxide (CO₂)

• none of the above

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Which of the following is a clue that a chemical change has occurred? (Choose all correct answers.)

• Formation of a gas (bubbles)

• Color change

• Phase change

• Produces light or heat

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NGSS.MS-PS1-2

This image shows what happens when methane gas (CH₄) is burned (reacts with oxygen O₂). This represents a chemical change because

• there is only one carbon atom.

• the products and reactants are made of atoms and molecules.

• there are the same number of atoms before and after.

• the atoms have rearranged to form new molecules.

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NGSS.MS-PS1-2

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Fizzing, foaming, and burning are all examples of

• Chemical change

• Physical change

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

• change in shape

• melting

• formation of a gas

• dissolving

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Is melting butter for popcorn a chemical or physical change?

• chemical

• physical

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NGSS.MS-PS1-2

Freezing Juice?

• Physical Change

• Chemical Change

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