Property Changes in Chemical Reactions

What is a chemical change?

• a change in matter in which the substances that make up that matter change into substances with the same chemical and physical properties

• a change in matter in which the substances that make up that matter change into substances with different chemical and physical properties

• a change in matter in which the substances that make up that matter change into substances with only different chemical properties

• a change in matter in which the substances that make up that matter change into substances with only different physical properties

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What are some signs of a chemical change?

• change in amount

• Bubbles, change in color/ smell/ energy

• change in taste

• change in shape

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What happens to the mass of a substance during a chemical change?

• It decreases

• It doubles

• It increases

• It is conserved

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What is the law of conservation of mass?

• The total mass before and after a chemical reaction are the same

• The total mass before and after a chemical reaction are different

• The total mass before and after a chemical reaction are increased

• The total mass before and after a chemical reaction are decreased

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What happens to atoms during a chemical change?

• Atoms are destroyed

• New atoms are created

• Nothing

• They break their bonds, rearrange, and, make new bonds

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What is a chemical reaction?

• When atoms of one or more substances rearrange and form one or more new substances

• The structure doesn't change

• No new substances are created

• Substances rearrange but no new substances are created

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What is a reactant in a chemical reaction?

• The starting substances

• The ending substances

• The coefficients

• The equal sign

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What is the product in a chemical reaction?

• The starting substances in a chemical reaction

• The arrow in a chemical reaction

• The substances that are produced by the chemical reaction

• The coefficients

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How can a chemical reaction be represented?

• an equation/ formula

• coefficients

• only reactants

• only products

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NGSS.MS-PS1-1

What is a coefficient in chemistry?

• H2O

• the big number in front of an element that shows how many atoms of a substance there are

• the small number after an element

• The atomic number

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