Identification of anions and gases

28 March 2023
Identification of anions and gases
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Slide 1: Slide
PhysicsSecondary EducationAge 12,13

This lesson contains 13 slides, with interactive quizzes and text slides.

Items in this lesson

28 March 2023
Identification of anions and gases

Slide 1 - Slide

Content objectives
  • Describe tests to identify the anions
  • Describe tests using aqueous sodium hydroxide and aqueous ammonia to identify the aqueous cations
  • Describe tests to identify the gases

Slide 2 - Slide


The choice of the separation method depends on the ________ of the substances being separated.
nature
mass

Slide 3 - Poll


All methods rely on a difference, usually in a _______ property such as the boiling point between the substances being separated.
physical
chemical

Slide 4 - Poll

What method is shown below?

Slide 5 - Slide

Separating a mixture of solids
Differences in solubility can be used to separate solids.
For a difference in solubility, a suitable solvent must be chosen to ensure the desired substance only dissolves in it and not other substances or impurities; e.g., to separate a mixture of sand and salt, water is a suitable solvent to dissolve the salt, but not the sand.

Slide 6 - Slide

Filtration
Differences in solubility can be used to separate solids.
Used to separate an undissolved solid from a mixture of the solid and a liquid/solution ( e.g., sand from a mixture of sand and water)

Slide 7 - Slide

When is this method used?

Slide 8 - Slide

Crystallisation
Differences in solubility can be used to separate solids.
Used to separate a dissolved solid from a solution when the solid is more soluble in the hot solvent than in the cold (e.g. copper sulfate from a solution of copper (II) sulfate in water)

Slide 9 - Slide

Group work

Slide 10 - Slide

What will you do?

Slide 11 - Slide

Plenary (Sharing)

Slide 12 - Slide

What's next?
Laboratory Task

Slide 13 - Slide