A chemical equation describes a reaction, indicating the reactants and products.

Oxidation is a type of reaction in which oxygen bonds to elements of the reactants.

Decomposition is a type of reaction in which a reactant compound breaks down into two or more products.

A reaction in which an insoluble salt forms from two solutions is called a precipitation reaction.

Three types of chemical reaction

Combined science

Conservation of mass

Balancing equations

Mass in a chemical reaction

Uncertainties in measurements: chemistry

Empirical formula calculations

In the Making salts unit, pupils will learn about the production of pure salts, concentration and strength of acids, and what makes acids acidic and how bases can neutralise them.

In the Understanding Chemical Reactions unit, pupils learned about how atoms rearrange during chemical reactions and the conservation of mass.

This unit covers writing chemical formulae, balancing equations, and using the conservation of mass. It includes calculating moles, empirical formulae, relative formula masses, and theoretical yields. Emphasis is on stoichiometry, concentration, gas volumes, and using standard form.

Calculations involving masses

What does the "+" symbol represent in a chemical equation?

In an oxidation reaction, what chemical substance does a reactant combine with?

What is produced in a decomposition reaction?

In a chemical equation the {{}} signifies "changes into", indicating the transformation of reactants into products.

A reaction that forms an insoluble salt when two solutions are mixed is called a {{}} reaction.

Which of the following are oxidation reactions?

In a chemical reaction, what are the substances called that start the reaction?

True or false?: A physical change alters the chemical composition of the substance.

Which of the following statements best describes a chemical change?

What is the term for a substance that does not dissolve in water?

Exit Quiz

What does the "+" symbol represent in a chemical equation?