An insoluble solid formed when two solutions react together.

An ion is an atom or group of atoms with a positive or negative charge due to the loss or gain of electrons.

Identifying unknown substances (including barium)

Chemistry

In the Groups of the Periodic Table unit, pupils learned about the properties and reactivity of elements in the same group.

Physical activity and equipment requiring safe use

What colour flame does sodium produce in a flame test?

What does a white precipitate indicate in a precipitation reaction?

 breaking down complex procedures into simpler steps.

Flow charts help in chemical analysis by ...

What is an important practice when recording observations?

To ensure correct identification of substances.

What is the purpose of accurate observation in chemical analysis?

What should be recorded during a flame test?

 What forms when two or more elements chemically combine?

atoms are rearranged to form new substances

To organise elements based on their properties.

What is the purpose of the periodic table?

The total number of particles in the atom.

The number of electrons in a neutral atom.

What information does the atomic number of an element provide?