when atoms are rearranged to make new products and changes can be observed e.g. bubbles of gas forming.

occurs in one direction only where the reactants are converted into the products.

elements or compounds before a reaction takes place. Reactants are found on the left hand side of a chemical equation.

elements or compounds that are formed after a reaction has taken place. Products are found on the right hand side of a chemical equation.

Characteristics of chemical reactions

Science

Conservation of mass and balanced symbol equations

Chemical reactions: oxidation

Chemical reactions: combustion

Chemical reactions: decomposition

Chemical reactions: precipitation

In the Acids and Bases unit, pupils will build on their understanding of chemical reactions to learn about the properties of acids, bases, alkalis, and the neutralisation reaction.

In the Atoms, Elements and Compounds unit, pupils learned about atoms, elements, and compounds and how particles reorganise in a chemical reaction.

This unit covers the conservation of mass in changes of state and chemical reactions, including atom rearrangement. It also focuses on representing reactions with formulae and equations, exploring combustion, decomposition, and displacement, and distinguishing chemical from physical changes.

Understanding chemical reactions

represents a substance using element symbols and the number / ratio of atoms of each element in the substance.

is a way of describing a reaction using the chemical names of the reactants and products.

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.

is the number placed in front of a chemical formula to balance an equation; it multiplies all the atoms in the formula and shows the ratio of substances in a reaction.

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

a compound containing oxygen that is formed during an oxidation reaction

refers to the corrosion of iron or steel, in the presence of water and oxygen

when a metal reduces in size due to a chemical reaction

Fuel reacts with oxygen to release energy and requires fuel, oxygen and heat to start the reaction.

Is a type of combustion where substances react with oxygen and produce visible flames.

Made up of two or more atoms chemically bonded together. These are usually non-metal atoms.

A substance that releases its stored energy when it undergoes combustion.

A type of reaction in which oxygen bonds to elements of the reactants.

When a substance decomposes it undergoes a decomposition reaction.

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

The process where a precipitate is formed.

An insoluble solid formed when two solutions react together.

Formed when a substance is dissolved in water.

A way of describing a substance that will not dissolve in a particular solvent.

A chemical test that confirms the presence of a substance, it does not tell you how much of the substance is present.

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