# Determining an equation from given values

I can deduce the balanced symbol equation from the masses of reactants and products of a given reaction.

# Determining an equation from given values

I can deduce the balanced symbol equation from the masses of reactants and products of a given reaction.

## Lesson details

### Key learning points

- The stoichiometry of a chemical reaction is the molar ratio of each substance in a balanced symbol equation.
- Stoichiometric values can be calculated using masses found by experiment.
- Subscript values in chemical formula indicate the ratio of atoms/ions in a molecule/formula unit.

### Common misconception

Some pupils incorrectly interpret subscript and stoichiometric values in a balanced symbol equation.

Both subscript and stoichiometric values represent ratios. Subscripts indicate ratios *within* substances; stoichiometry. Molar ratios *between* substances in a reaction. Much practice distinguishing between/ interpreting these is time well spent.

### Keywords

Balanced symbol equation - Describes a reaction using a symbol equation with coefficients, which ensure there are equal numbers of atoms of each element on both sides of the symbol equation.

Stoichiometry - Refers to the molar ratio of the reactants and products in a chemical reaction.

Mole - A mole of something is 6.02 × 10²³ of it. The mass of a mole of a substance is its relative mass expressed in grams.

Ratio - Ratio can be used to determine the size of one quantity in relation to another.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

Loading...