8.1 Balancing Equations

Chemical change

A process involving one or more substances changing into a new substance

Chemical reaction

The process by which the atoms of one or more substances are rearranged to form different substances.

Reactants

Starting substances

Products

Substances formed

Chemical equation

Uses chemical formulas to show the identities and relative amounts of the substances involved in a chemical reaction.

Coefficient

Is the number written in front of a reactant or product.

Skeleton equation

is the equation before balancing

Evidence of a chemical reaction:

1. Temperature change

2. Heat and light formation

3. Color change

4. Odor

5. Gas bubbles

6. Formation of a solid

Separates two or more reactants or products

+

Separates reactants from products:

———>

(s)

Identifies a solid state

(l)

Identifies a liquid state

(g)

Identifies a gaseous state

(aq)

Identifies a water solution

Separates reactants from products and indicates a reversible reaction:

—>

←

What tells us quantity in the equation?

Symbols tell us quantity

Skeleton equations use_______ and _______ to

represent reactants and products.

Symbols,formulas

uses chemical formulas to

show the identities and relative amounts of the

substances involved in a chemical reaction.

Chemical equation