Tagged: separating mixtures

Separating Mixtures

centrifuge for DNA

This is a centrifuge for isolating DNA from samples.

In Year 7 Science we are starting a new unit of work about “Separating Mixtures”. We will be learning about the following processes and how they are used when separating mixtures:

  • Centrifuging
  • Crystallization
  • Chromotography
  • Distillation
  • Evaporation
  • Filtering
  • Froth Flotation
  • Gravity Separation
  • Magnetic Separation
  • Seiving

You will each work in a group to prepare a poster that can displayed in the class to show how each of these processes works, an example of how it may be used at home or in industry and a definition from the glossary of your text book.

At the end of this unit of work you may like to try these quizzes: How would you Separate these Mixtures? Flashcards and Matching at Quia: Separating Mixtures Rags to Riches: Who wants to be a Millionaire Another quick quiz from Pearson Education: Separating Mixtures. Check out the Year 7 wiki for more about Separating Mixtures.

Separating Mixtures

Today the Year 7R science class successfully separated a mixture of salt, sand, rice and iron filings. We used a range of methods of separation including seiving, magnetic separation, filtering, decanting and evaporation and crystallisation. All the images have been saved in a folder called “Separating Mixtures” in the year 7 Science folder on the Student Public drive. Use these images to create a Photostory (with audio) or a PowerPoint (with text) describing the procedure you used to separate the materials and how successful you were in collecting pure materials. How would you improve your method if you did this experiment again? How were some of the materials lost?

See Katie and Chloe’s PowerPoint of the process they used here.

Cody and Dylan’s Video here: seperating-mixtures

Separating Mixtures

Photo of distillation equipment

After our experiments to evaporate the water from soft drink and create crystals from a filtered copper sulphate solution, we will have an assessment task – separating rice grains, salt, iron filings and sand from a mixture of these components.

Here are some sites to help you learn more about separating mixtures:

A worksheet to complete: http://www.hi.com.au/resource/science/pdf/Mixtures2.pdf

Separating salt and sand: http://www.zephyrus.co.uk/separatingmixtures1.html

Separating iron from sand; http://www.mikecurtis.org.uk/mixtures.htm

S-cool: http://www.s-cool.co.uk/gcse/chemistry/atomic-structure/separating-mixtures.html

Bitesize Chemistry: http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/elements_com_mix_8.shtml

DIGILEARN – https://www.eduweb.vic.gov.au/dlrcontent/5239383436/index.html

DIGILEARN: http://www.eduweb.vic.gov.au/dlrcontent/4c33313938/index.html

CATALYST (video): Recycling water

CATALYST (video): Froth Flotation