A substance made by a chemical reaction where two or more different elements chemically bond together.

A strong force that holds atoms together in a compound. A chemical bond takes lots of energy to overcome and break.

Compounds and their formation

Science

Atoms and elements

Properties of elements

Metallic elements

Molecular elements

Common elements

Chemical formulae

Naming compounds

A particle model of chemical reactions

In the Understanding Chemical Reactions unit, pupils will build on their knowledge of atoms, elements, and compounds to learn about how atoms rearrange to form new substances during chemical reactions.

In the Solid, Liquid and Gas States and Changes of State unit, pupils learned to categorise substances and understand particle behaviour during changes of state.

This unit explores the basic atomic model, the differences between atoms, elements, and compounds, and the varying physical and chemical properties of elements. It covers chemical symbols, formulae, SI units, and IUPAC nomenclature, emphasising their use in describing elements and compounds.

Atoms, elements and compounds

Two or more different elements chemically bonded.

A mixture of elements without chemical bonding.

A new substance is created with different properties.

In a chemical reaction, what happens when a chemical bond is formed?

Which of the following words can be used to describe the following substance? Look at the diagram below.

Which of the following is a chemical compound?

It can be separated back into its elements by physical means.

It has the same properties as its component elements.

Which statement is true about a chemical compound?

The elements forget about their properties.

A compound is a completely different chemical to the elements that made it.

Compounds are always changing their properties

Why do compounds have different properties than the elements they are made from?

What does each element on the periodic table represent?

According to Dalton's atomic theory, what is an atom?

A force that holds atoms together in a substance

Which of the following are the correct symbols for the elements stated?

Air (includes oxygen, nitrogen, argon, carbon dioxide etc.)

Molecules of water (made of hydrogen and oxygen atoms)

Which of the following is a pure substance?

Compounds and their formation

Lesson outcome