Chemical reactions

What is a chemical reaction?

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

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

• a change in matter when the physical appearance changes

• a very boring change in matter

This change is a

• chemical reaction

• physical change

• musical change

• all answers are correct

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

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

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

• endothermic

• eccentric

• exothermic

• ectomorphic

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

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

• solid

• liquid

• gas

• plasma

How is a chemical change different from a physical change?

• there is no difference

• a physical change creates a new substance

• a chemical change creates a new substance

• None of them

A substance that is formed as the result of a chemical reaction is a __________________

• Product

• Reactant

• Starts

• Enders