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Mixtures
Mixtures
There are a great number of mixtures. Soft drinks, Vegemite, coffee, milk, sea water, hair gel, air and sunscreen are a few examples of mixtures that we see every day.
There are a great number of mixtures. Soft drinks, Vegemite, coffee, milk, sea water, hair gel, air and sunscreen are a few examples of mixtures that we see every day.
A mixture contains two or more chemically pure substances that may be separated using a physical process such as sieving or filtering. When a mixture is made, no new substances are formed – it’s just the particles of one substance spread through the particles of other substances.
A mixture contains two or more chemically pure substances that may be separated using a physical process such as sieving or filtering. When a mixture is made, no new substances are formed – it’s just the particles of one substance spread through the particles of other substances.
Look around your home and you will be surprised at the number of different mixtures that we use every day. The separation of mixtures can give us pure substances. To obtain pure substances, we often need to remove insoluble substances from a mixture using several methods. These are used in industry to purify metals, to separate gold from river sand and sediment from old bottles of wine.
Soluble substances are more difficult to separate out of mixtures than insoluble substances. The methods used rely on the basic properties of matter, and are used in many industrial applications. These include making salt from sea water, purifying water for drinking, and even in forensics for working out who committed a crime. This unit looks at the different types of mixtures, methods for separating mixtures and some applications of this in everyday life such as making a water filter.
Student Learning Goals:
Student Learning Goals:
9. Students can describe the importance of water as a solvent in all aspects of our daily lives.
10. Students can describe aqueous mixtures in terms of the solute, the solvent and the solution.
11. Students can identify the factors which affect solubility of solutes in water.
12. Students can link the relevant separation technique for a particular mixture to the physical principles involved in each process.
13. Students can demonstrate and explain the purpose of filtration.
14. Students can demonstrate and explain the purpose of decantation.
15. Students can demonstrate and explain the purpose of evaporation.
16. Students can demonstrate and explain the purpose of crystallisation.
17. Students can demonstrate and explain the purpose of chromatography.
18. Students can demonstrate and explain the purpose of distillation.
19. Students can identify everyday examples of separation techniques, including water filtration, sorting waste materials, extracting pigments or oils from plants, separating blood products and cleaning up oil spills.
20. Students can discuss examples of separation techniques by different scientists in different occupations.
NESA Syllabus Requirements
NESA Syllabus Requirements
Outcome
explains how scientific understanding of, and discoveries about, the properties of elements, compounds and mixtures relate to their uses in everyday life SC4‑17CW
CW3 Mixtures, including solutions, contain a combination of pure substances that can be separated using a range of techniques. (ACSSU113)
Students:
a. describe the importance of water as a solvent in daily life, industries and the environment
b. describe aqueous mixtures in terms of solute, solvent and solution
c. 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
d. 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
e. research how people in different occupations use understanding and skills from across the disciplines of Science in carrying out separation techniques
Additional content
Students:
investigate the nature of mineral crystals
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