Chapter 7: Simple Chemical Reactions (G8 SISB)

What type of change is the explosion of fireworks?

• Physical change

• Chemical change

• Biological change

• Mechanical change

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NGSS.MS-PS1-2

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What is an example of a chemical reaction that occurs slowly and quietly?

• Explosion of fireworks

• Melting of ice

• Rusting of iron

• Boiling of water

What is a physical change in matter?

• A change where new substances are formed

• A change that is irreversible

• A change where no new substances are formed

• A change that involves a chemical reaction

What type of change is boiling water?

• Chemical change

• Physical change

• Both chemical and physical change

• Neither chemical nor physical change

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What type of change occurs when sugar or salt dissolves in water?

• Chemical change

• Physical change

• Biological change

• Nuclear change

What happens when copper carbonate is heated?

• It melts into a liquid

• It forms copper oxide and carbon dioxide

• It turns into copper metal

• It evaporates

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NGSS.MS-PS1-2

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Why are chemical changes not easily reversible?

• They involve a change in temperature

• They create new substances

• They are too slow

• They require a lot of energy

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Which of the following is an example of a physical change?

• Wood burning

• Bread toasting

• Iodine subliming

• Food decaying

What are the substances at the start of a chemical reaction called?

• Products

• Reactants

• Catalysts

• Enzymes

What is formed when iron reacts with sulfur?

• Iron oxide

• Iron sulfide

• Iron nitrate

• Iron chloride

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NGSS.MS-PS1-2

NGSS.MS-PS1-5