Law of Conservation of Mass

Front

The Law of Conservation of Mass states that

Back

Matter cannot be created or destroyed in a chemical reaction; the mass stays the same.

Front

A process where substances (reactants) change into new substances (products).

Back

Chemical Reaction

Front

A way to show a chemical reaction using symbols and formulas.

Back

Chemical Equation

Front

Coefficient

Back

A number in front of a chemical formula that shows how many molecules there are.

Front

A small number after an element symbol in a formula that shows how many atoms of that element are present.

Back

Subscript

Front

Reactants

Back

The starting substances in a chemical reaction.

Front

A change that forms a new substance

Back

Chemical Change

Front

A change in size, shape, or state (solid, liquid, gas), but the substance stays the same.

Back

Physical Change

Front

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have? Options: 4g, 5g, 9g, 14g

Back

4g

Front

Identify the subscripts in the chemical formula: 3Fe₂O₄

Back

2,4