Chemical Reactions and Energy

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 the matter in a chemical reaction gets colder it is called

• exothermic

• endothermic

• eccentric

• endomorphic

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When the matter in a chemical reaction gets warmer it is called

• exothermic

• endothermic

• eccentric

• endomorphic

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The products are:

• molecular oxygen and 2 carbon

• 2 carbon monoxide

• all of these are products

• all of these are reactants

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The reactants are:

• molecular oxygen and 2 carbon

• 2 carbon monoxide

• all of these are products

• all of these are reactants

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A precipitate is a ___________ that forms when 2 liquids react together.

• solid

• liquid

• gas

• plasma

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Reactants are the chemicals that are present at the beginning of an experiment. Reactants react together to make the product.

We can know that a chemical reaction is occurring when we see ______.

• that the product looks just like the reactants.

• nothing new.

• that the product looks different from the reactants.

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Which of the following is evidence of a chemical reaction?

• Tearing paper.

• Change in color.

• Production of a gas.

• Change in temperature.

• Production of a precipitate.

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