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Criado por Charlotte Hewson
mais de 9 anos atrás
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Questão | Responda |
what allows carbon atoms to build up? | they readily form bonds with other carbon atoms |
what is the name given to given to each of the individual molecules that make up a chain? | monomers |
what is the longer chain made up of repeating monomer units called? | polymer |
what 4 elements are most polymers made up of? | -carbon -hydrogen -oxygen -nitrogen |
what is the basic monomer unit in carbohydrates? | a sugar |
what is another name for this? | a saccharide |
so what is a single monomer called? | monosaccharide |
what is formed by a pair of monosaccharides? | a disaccharide |
what do three or more monosaccharides join to form? | polysaccharides |
what is the general formula for monosaccharides? | ( CH(2) O ) (n) - where n can be any number between 3 to 7 |
how many carbons does glucose have? what is the name for this? | - 6 carbon - hexose sugar |
what shape do the atoms form in their molecular arrangement? | a ring |
which saccharides are reducing sugars? | all monosaccharides and some disaccharides e.g. maltose |
what does a reduction involve? | gaining electrons |
what is a reducing suger? | a sugar that can donate electrons to (or reduce) another chemical |
what test is done to test for a reducing sugar? | benedicts test |
what is gaining the elsectron in this test? | the Benedicts reagent |
what is benedicts reagent? | an alkaline solution of copper (II) sulfate |
what happens when a reducing sugar is heated with benedicts reagent? | it forms an insoluble red precipitate of copper (I) oxide |
how is the test carried out? | -add the food sample to a test tube. if not in liquid form, grind it up -add an equal volume of benedicts reagent -heat the mixture in a gently boiling water bath for 5 mins |
what are the concentrations depending on the colour? | none = blue very low = green low = yellow medium = brown high = red |
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