Chemical Equations-Counting Atoms(TEK 7C)

24

432

3

1

C

Br

Fe

NaCl

Matter is not created or destroyed.

The total mass of the reactants is greater than the total mass of the products.

The total mass of the reactants is less than the total mass of the products.

Matter is not changed.

matter cannot be created or destroyed, it only changes form

matter can be created but it cannot be destroyed, it never changes form

matter can be destroyed but it cannot be created, it usually just changes form

matter is an unproven theory created by Hans Geiger

Products

Coefficients

Precipitates

Reactants

products

reactants

An Atom

The Subscript

A Molecule

The Coefficient

An exponent

The coefficient

A molecule

The subscript

Fe = 1, O = 2

Fe = 2, O = 3

Fe = 2, O = 1

Fe = 1, O = 3

4 hydrogen atoms

1 hydrogen atom

2 hydrogen atoms

3 hydrogen atoms

A

B