Physical Science Chapter 7 Review

What type of change is burning classified as?

• Biological change

• Chemical change

• Mechanical change

• Physical change

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What occurs when a substance undergoes a chemical change?

• A chemical reaction takes place

• It becomes a gas

• It remains the same

• It turns into a liquid

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What does the law of conservation of mass state?

• Mass is created and destroyed in a chemical reaction.

• Mass is only destroyed in a chemical reaction.

• Mass is neither created nor destroyed in a chemical reaction.

• Mass is only created in a chemical reaction.

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What are the substances called that undergo change in a chemical reaction?

• Enzymes

• Reactants

• Catalysts

• Products

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What are the new substances formed as a result of a chemical reaction called?

• Reactants

• Products

• Catalysts

• Enzymes

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What is the correct representation of a chemical reaction?

• Reactants → Products

• Reactants = Products

• Products → Reactants

• Products = Reactants

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How is the chemical equation for the burning of charcoal written in chemical formulas?

• C + O₂ → H₂O

• C + O₂ → CO

• C + O₂ → CO₂

• C + O₂ → CH₄

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What does a chemical equation represent?

• A representation of a chemical reaction

• A physical change in matter

• A mathematical formula

• A biological process

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How can the equation C + O₂ → CO₂ be read?

• Carbon and hydrogen react to form methane

• Carbon dioxide decomposes into carbon and oxygen

• Carbon and oxygen form water

• Carbon and oxygen react and form carbon dioxide

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What does the law of conservation of mass state about chemical reactions?

• The mass of the products is less than the mass of the reactants.

• The mass of the products is equal to the mass of the reactants.

• The mass of the products is unrelated to the mass of the reactants.

• The mass of the products is greater than the mass of the reactants.

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