1 | The chemical Earth
1: The living and non-living components of the Earth contain mixtures
Lesson 1 | Matter on Earth
Identify the difference between elements, compounds and mixtures in terms of particle theory.
Identify that the biosphere, lithosphere, hydrosphere and atmosphere contain examples of mixtures of elements and compounds.
Lesson 2 | Separation & analysis of mixtures
Identify and describe procedures that can be used to separate naturally occurring mixtures of:
– solids of different sizes
– solids and liquids
– dissolved solids in liquids
Assess separation techniques for their suitability in separating examples of earth materials, identifying the differences in properties which enable these separations.
Identify data sources, gather, process and analyse information from secondary sources to identify the industrial separation processes used on a mixture obtained from the biosphere, lithosphere, hydrosphere or atmosphere and use the evidence available to:
– identify the properties of the mixture used in its separation
– identify the products of separation and their uses
– discuss issues associated with wastes from the processes used
Describe situations in which gravimetric analysis supplies useful data for chemists and other scientists.
Lesson 3 | Separation of a simple mixture
Identify data sources, plan, choose equipment and perform a first-hand investigation to separate the components of a naturally occurring or appropriate mixture such as sand, salt and water.
Gather first-hand information by carrying out a gravimetric analysis of a mixture to estimate its percentage composition.
Lesson 4 | Writing and balancing chemical equations
Construct word and balanced formulae equations of chemical reactions as they are encountered.
Gather and present information from first-hand or secondary sources to write equations to represent all chemical reactions encountered in the Preliminary course.