Year 7 Term 1: Chemical WorldMixtures, separation techniques and chemical reactions
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Revise assumed knowledge:
ST3-12MW
identifies the observable properties of solids, liquids and gases, and
that changes made to materials are reversible or irreversible
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ST3-13MW
describes how the properties of materials determine their use for specific purposes
CW3 Mixtures, including solutions, contain a combination of pure substances that can be separated using
a range of techniques. (ACSSU113)
4CW3a. describe the importance of water as a solvent in daily life, industries and the
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environment
Provide a basic description of matter, atoms, elements, compounds and mixtures.
Define solvent
Describe the importance of water as a solvent in daily life, industries and the environment
4CW3b. describe aqueous mixtures in terms of solute, solvent and solution
Define aqueous, solvent, solute and solution
first-hand investigation(s): Crystallisation- Salt water
Separate salt from mixture of saltwater.
Discuss in terms of mixture, solvent, solute and solution
4CW3c. relate a range of techniques used to separate the components of some common
mixtures to the physical principles involved in each process, including filtration,
decantation, evaporation, crystallisation, chromatography and distillation
first-hand investigation(s):
Define and separate a range of mixtures using physical separation techniques, including
 Filtration
 Decantation
 Evaporation
 Crystallisation
 Chromatography
 Distillation
Briefly describe common usages of the above separation techniques
first-hand investigation(s): Complex separation
Design an experiment to separate a mixture of sand, salt, iron filings and water using
both filtration of sand and then evaporation of salt
first-hand investigation(s): Crystallisation- Soft drink
Perform crystallisation of a soft drink incorporated with numeracy task
first-hand investigation(s): Chromatography
Chromatography of leaves
4CW3d. investigate the application of a physical separation technique used in everyday
situations or industrial processes, eg water filtering, sorting waste materials, extracting
pigments or oils from plants, separating blood products or cleaning up oil spills
Research task(s)
 Research current technologies used to separate blood products
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 Evaluate the development of artificial blood
Research task(s)
 Research current technologies used to clean oil spills
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 Evaluate the impact of oil spills v's the usage of oil
Research task(s)
 Research current technologies used to produce our water supply and clean
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sewage.
 Evaluate the impact of the new desalination plant in Sydney
4CW3e. research how people in different occupations use understanding and skills from
across the disciplines of Science in carrying out separation techniques
Research task(s)
 Research how people in different occupations use understanding and skills from
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across the disciplines of Science in carrying out separation techniques. eg,
Separation of blood products, Mining industry, Council recycling
CW4 In a chemical change, new substances are formed, which may have specific properties related to
their uses in everyday life
4CW4a. identify when a chemical change is taking place by observing a change in
temperature, the appearance of new substances or the disappearance of an original
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substance
Describe and distinguish between physical and chemical change
Describe the 5 observable changes of a chemical reaction taking place
Describe the law of conservation of matter
Describe some simple chemical changes in terms of the rearrangement of particles
first-hand investigation(s): Water + Sodium bicarbonate
Add 1teaspoon of Sodium bicarbonate to 10mL water in sealed bag.
4CW4b. demonstrate that a chemical change involves substances reacting to form new
substances
first-hand investigation(s): Perform the ‘Pop test”
first-hand investigation(s): Burn magnesium
Describe the properties of acid and bases
Define pH
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first-hand investigation(s): Neutralisation
Add Universal indicator to 10mL NaOH and 10mL HCl. Observe colour changes. Add
the NaOH to the HCl drop by drop until it turns green.
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Test for the acidity and basicity of common substances using indicators
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4CW4c. investigate some examples of chemical change that occur in everyday life, eg
photosynthesis, respiration and chemical weathering
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Define photosynthesis, respiration and weathering
Write word and symbol equations for photosynthesis and respiration
first-hand investigation(s): Acid + Calcium Carbonate
Reaction of hydrochloric acid with marble chips to make aqueous calcium chloride and
carbon dioxide gas bubbles
first-hand investigation(s): Isolating starch from leaves
Identify starch as the storage product of photosynthesis in suitable leaves
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4CW4d. compare physical and chemical changes in terms of the arrangement of particles
and reversibility of the process
Using previous examples of chemical reactions describe why physical and chemical
changes tend to be reversible and irreversible respectively in terms of the rearrangement
of particles
4CW4e. propose reasons why society should support scientific research, eg in the
development of new pharmaceuticals and polymers
Research task(s)
Propose reasons why society should support scientific research, eg in the development of
new pharmaceuticals and polymers. eg.
– Compare water treatment in Australia to third world water supplies
– Malaria: History and drug production (chloroquinine)
– Vaccination
– Ulcers
4CW4f. describe, using examples, how science knowledge can develop through
collaboration and connecting ideas across the disciplines of science, eg making or
obtaining new substances from Earth's spheres
Research task(s)
In pairs research how science knowledge can develop through collaboration and
connecting ideas across the disciplines of science. eg. Mining:
– Geologists
– Computer scientists
– Engineers
– Biologists (EPA)
4CWadd5 investigate how the chemical properties of a substance will affect its use, eg
flammability and ability to corrode
Research task(s)
 investigate how the chemical properties of a substance will affect its use, eg
flammability and ability to corrode
– Fire brigade uniform
– Swimsuits
– Bridge construction
– Car racing gear
TOPIC TEST
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