Chemical Reacations and Conservation of Matter

Physical reactions

Chemical reactions

Physical changes

Energy changes

Reactants are created in the reaction, products take part in the reaction

Reactants are substances that take part in the reaction, products are created in the reaction

Reactants and products are the same

Reactants are always gases, products are always solids

Reactants: NaCl; Product: Na and Cl

Reactants: Na and Cl; Product: NaCl

Reactants: Na; Product: Cl and NaCl

Reactants: Cl; Product: Na and NaCl

Matter can be created and destroyed during a chemical reaction.

Mass cannot be created or destroyed, and whatever is on one side of a chemical reaction must be on the other.

Atoms change their identity during a chemical reaction.

Energy is always conserved in every chemical reaction.

The number of magnesium atoms is the same on both sides.

The number of oxygen atoms is the same on both sides.

The type of atoms changes during the reaction.

The total number of atoms is conserved.

Coefficient

Subscript

Arrow

Chemical Symbol

Na and Cl₂ are reactants.

NaCl is the product.

Cl₂ is a product.

Na is a product.