2.4 Chemical Reactions

Chemical reactions change substances into different substances by

• conserving matter between the substances.

• breaking and forming chemical bonds

• strengthening electrical charges of substances.

• changing a solvent into a solute.

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NGSS.HS-PS1-2

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Identify the reactants in the following chemical reaction: 6H₂O + 6CO₂ →

C₆H₁₂O₆ + 6O₂

• 6H₂O and 6CO₂

• 6CO₂ and C₆H₁₂O₆

• 6H₂O, C₆H₁₂O₆, and 6O₂

• C₆H₁₂O₂ and 6O₆

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NGSS.HS-PS1-2

• takes place very rapidly.

• is very unstable.

• occurs in both directions.

• has high bond energies.

What is the term for the amount of energy that needs to be added for a chemical

reaction to start?

• chemical energy

• activation energy

• bond energy

• reactant energy

Which phrase best describes an exothermic chemical reaction?

• does not absorb any energy

• forms products with higher bond energy than reactants

• is in a state of equilibrium

• releases more energy than it absorbs

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NGSS.HS-PS1-4

When hydrogen and oxygen combine to form water, water is

• a product

• an enzyme

• a reactant

• a catalyst

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

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What is the process that changes one set of substances into another set of substances?

• cohension

• chemical reactions

• hydrogen bonding

• activation energy

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NGSS.HS-PS1-2

Letter A represents

• activation energy

• reactants

• difference in energy

• products

• total energy released

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NGSS.HS-PS1-4

Letter B represents

• activation energy

• reactants

• difference in energy

• products

• total energy released

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NGSS.HS-PS1-4

Letter D represents

• activation energy

• reactants

• difference in energy

• products

• total energy released

Tags

NGSS.HS-PS1-4