Balancing Chemical Equations

Coefficients

Tells you about the quantity, or number of molecules in a compound (Full size number before Element)

Subscripts

Tells you how many atoms of a particular element are in a compound (Number below and after Element)

Reactants

Left-side of chemical equation (substances elements are compounds that are changed)

Products

Right-side of chemical equation (substances elements or compounds after a chemical reaction occurs)

Molecule

Are made up of atoms that are bonded or combined together

Parts of a Chemical Equation

Reactants → Products (reactants yields or produces products)

Law of Conservation of Matter (Mass)

Matter (Mass) can not be be created or destroyed only transformed

Chemical equations must be balanced because:

Matter cannot be created or destroyed only transformed.

Atoms are not _______________ or _____________ during a chemical reaction.

Atoms are not CREATED or DESTROYED during a chemical reaction.

Scientists know that there must be the ___________ number of atoms on each ___________ of

the ____________.

Scientists know that there must be the SAME number of atoms on each SIDE of the EQUATION.

To balance the chemical equation, you must add _______________ in front

of the chemical formulas in the equation. You cannot _______ or ___________ subscripts!

To balance the chemical equation, you must add COEFFICIENTS in front of the chemical formulas in the equation.

You cannot ADD or CHANGE subscripts!

Chemical Equation Example

How atoms in many Oxygen?

2AgNO

2

How many atoms in Nitrogen?

4N2

8

How many atoms of Hydrogen?

2NOH

2

How many atoms of Carbon?

4CCl

4

The building blocks of matter are known as?

Atoms

If you know only the Atomic Number what information can you determine?

Protons

Electrons

___________________is a substance that is made from one kind of atom only. It cannot be broken down into simpler substances

Elements

The atomic number gives the "identity " of an element as well as its location on the Periodic Table. No two different elements will have the same ____________

Atomic Number

What is located in the shell of an atom and orbits around the nucleus?

Electrons (negative charge)

Neutrally charged particles (sub-atomic particles)

Neutrons

___________are the basic units of matter and the definite structure of elements

Atoms