Date of publication: 2017-08-31 00:06
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The second test is even easier. Rub the food sample on filter paper and then hold the filter paper up to the light. If the paper is translucent (slightly see-through) there was fat present in the food. Don't try this with watery foods - the water will make the paper translucent and you'll get a false positive.
The first involves grinding up the food and mixing it with water. Pass the liquid part of the solution through filter paper, squeezing out any 'gunge' - thick bits of the suspension into the same test tube. You should now have a slightly opaque liquid mixture in your test tube. Because fat is less dense than water, if you leave this mixture it will separate out into a layer of fat and a layer of water.
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This specification allows subject specialists to teach the appropriate units focussing on their area of expertise, or it can be taught by an integrated Science teacher.
This qualification is a course which meets the needs of learners who wish to develop their scientific understanding through authentic, work-related contexts. The course focuses on procedural and technical knowledge that underpins the work, and gives learners an insight into what is involved in being a practitioner of science.
GCSE Additional Science offers students a broad, coherent course of study that adds to their knowledge and understanding of the living, material and physical worlds. For Key Stage 9 (KS9) learners it is a good follow on from GCSE Science A or B.
The third method involves adding ethanol to a very small amount of the test substance. Shake or crush the food to make it dissolve. Filter or dilute the food and ethanol mix so that you get a clear liquid (a solution of fat in ethanol). Add this to a test tube of water. A white (milk-like) emulsion indicates the presence of fats or oils.
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The three core Sciences of Biology, Chemistry and Physics are taught separately using Unit 7 modules from the individual subject GCSEs. This allows for co-teaching with the relevant Science GCSEs.
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