Edit · Reactants and Products

chemical reaction

process by which atoms or groups of atoms in substances are reorganized into different substances

clues that a chemical reaction has taken place

-production of heat or light

-formation of a new gas, liquid, or solid

substances can also undergo physical changes which...

change the appearance but not the composition

written chemical equations

chemical formulas describe the substances in the reaction and arrows indicate the process of change

reactants

the starting substances, on the left side of the arrow

products

the substances formed during the reaction, on the right side of the arrow

all living things are driven by

chemical reactions

What is the name for the substances that start a chemical reaction?

Reactants

What is the name for the substances that are a result of a chemical reaction?

Products

Chemical changes occur due to chemical reactions.

True

An example of a chemical change is burning a candle.

True

chemical bonds

broken or formed during a chemical reaction

"the arrow"

read as "yields" or "react to form"

chemical reactions

matter cannot be created or destroyed; must show this balance of mass

balanced equations

the number of atoms of each elements on the reactant side must equal the number of atoms of the same element on the product side

activation energy

the minimum amount of energy needed for reactants to form products

exothermic

reactions that release energy in the form of heat

endothermic

reactions that absorb energy in the form of heat