Chemical Reactions

What is a chemical reaction?

• a change in matter when the molecules rearrange to make new molecules

• a change in matter when matter changes its form or appearance

• a change in matter when the physical appearance changes

• a very boring change in matter

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The reactants in the image above are:

• CH4 and 2 O2

• 2 H2O and CO2

• All of these are reactants

• All of these are products

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The products in the image above are:

• CH4 and 2 O2

• 2 H2O and CO2

• All of these are reactants

• All of these are products

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When energy like heat and light are given off in a chemical reaction it is called

• exothermic

• endothermic

• eccentric

• ectomorphic

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Identify the products and reactants

a

b

reactants

products

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Identify which are the products and reactants

a

b

reactants

products

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NGSS.MS-PS1-2

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Which of the following is a type of chemical reaction?

• Melting

• Combustion

• Freezing

• Evaporation

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Label the parts of the reaction.

a

b

Reactants

Products

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What type of reaction involves the breaking down of a substance into simpler substances?

• Single Displacement Reaction

• Double Displacement Reaction

• Synthesis Reaction

• Decomposition Reaction

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What is the main characteristic of a combustion reaction?

• It involves the formation of a precipitate

• It involves the release of energy in the form of heat and light

• It involves the absorption of energy

• It involves the formation of a gas

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