Open Scied 7.1 Chemical Reactions and Matter

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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This image shows a

• chemical reaction

• physical change

• musical change

• all of these answers are correct

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This change is a

• chemical reaction

• physical change

• musical change

• all answers are correct

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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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When energy is absorbed and taken in during a chemical reaction it is called

• exothermic

• endothermic

• eccentric

• ectomorphic

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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Signs of a chemical change could be:

• a change in energy (temperature, light, sound)

• a precipitate forms (a solid forms from 2 liquids)

• formation of gas (bubbles)

• shocking change in color

• all of these answers are signs of chemical change

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