Law of Conservation of Mass

Law of Conservation

Matter is neither created nor destroyed

Chemical Equation

a way to describe a chemical reaction using chemical formulas and other symbols

Reactant

A chemical substance that is present at the start of a chemical reaction

Product

A chemical substance formed as a result of a chemical reaction

balanced equation

We have the same amount and kind of atoms in the reactants and in the products

Chemical Reaction

A reaction that changes the original substances. A new substance is form. Cannot be reversed.

Physical Reaction

A reaction that occurs without changing the original substances. NO new substance is formed. It can be reversed.

Examples of Chemical Reactions

Rust, oxidation,milk and vinegar, glows ticks

What elements are in the reactant side if we have a reaction products of NaCl

Na- sodium and
Cl - chlorine

What do you call the stuff you end up with in a chemical reaction?

products

should you have the same amount of atoms at the beginning and at the end of the reaction?

yes

Conservation of Mass

mass of the legos 50g - rearrange - mass of the legos 50g