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Task #6. List Down Practical Application of MIXTURES in Community, School and Industries.
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A number of different mixtures of different coloured beads

Source: Nikola Obradovic / Shutterstock.com

CPD

How to teach mixtures and solutions

David PatersonBy David Paterson16 April 2018

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11–14 chemistry: ideas, resources, and misconceptions to look out for

How did knowledge of chemical mixtures prevent a major incident in the London Underground?

When an accidental leak of wet, quick-drying concrete flooded London’s Victoria underground station control room, engineers’ quick thinking and chemical knowledge prevented total disaster. They mixed large amounts of sugar into the concrete, slowing down the setting process, and allowing them time to clear up the spill.

Mixtures and solutions are a common occurrence in our everyday lives. They are the air we breathe, the food and drink we consume and the fabrics we wear. By studying how chemists distinguish pure substances from mixtures and solutions, students will start to appreciate how matter is organised at the atomic level. With this knowledge, we can manipulate matter to improve our health and quality of life.

What do students need to know about mixtures and solutions?

Mixtures are materials that contain two or more chemical substances dispersed among each other (mixed together).

If no chemical reaction occurs when two materials are mixed, they form a mixture. The chemical properties of the components don’t change.

Mixtures can be separated by physical methods.

There are two general types of mixtures: homogeneous and heterogeneous.

Homogeneous mixtures: the particles of the substances are mixed together (there is no clumping of the particles) – eg air.

Solutions are homogenous mixtures: particles of one substance (the solute) are mixed together with the particles of another substance (the solvent) – eg salty water.

Heterogeneous mixtures: large aggregations (clumps) of the substances are mixed together – eg emulsions like oil in water.