3-1: Chemical reactions alter arrangements of atoms.
Pg. 69-77
Date:__________
1. Chemical Reaction: (Pg 69)
The process by which chemical changes occur; in a chemical
reaction, atoms are rearranged, and chemical bonds are
broken and formed
2. Reactant: (Pg 71)
A substance that is present at the beginning of a chemical
reaction and is changed into a new substance
3. Product: (Pg 71)
A substance that is formed by a chemical reaction; a product is
made by the rearrangement of atoms and bonds in reactants
4. Precipitate: (Pg 72)
A solid substance that forms as a result of a reaction between
chemicals in two liquids
5. Catalyst: (Pg 76)
A substance that increases the rate of a chemical reaction but
is not consumed in the reaction
3-2: The masses of reactants and products are equal.
Pg. 78-85
Date: __________
1. Law of Conservation of Mass: (Pg 79)
A law stating that atoms are not created or destroyed in a
chemical reaction
2. Coefficient: (Pg 82)
The number before a chemical formula that indicates how
many molecules are involved in a chemical reaction
3-3: Chemical reactions involve energy changes.
Pg. 86-93
Date: __________
1. Bond Energy: (Pg 86)
The amount of energy in a chemical bond between atoms
2. Exothermic Reaction: (Pg 87)
A chemical reaction that releases energy
3. Endothermic Reaction: (Pg 87)
A chemical reaction that absorbs energy
4. Photosynthesis: (Pg 90)
In green plants, the endothermic process in which light is
absorbed and used to change carbon dioxide and water into
glucose and oxygen
3-4: Life and industry depend on chemical reactions.
Pg. 94-99
Date: __________
1. Respiration: (Pg 94)
The exothermic process by which living things release energy
from glucose and oxygen and produce carbon dioxide and
water