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Chemistry Paper 2: C6 (Redox and alcohols (The optimum temperature for…
Chemistry Paper 2: C6
Redox and alcohols
The optimum temperature for fermentation is 25-50 degrees C, as if the temperature is too low the enzymes in the yeast are inactive. If the temperature is too high, the enzymes in the yeast are denatured
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The ozone layer
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Ultraviolet light on CFCs makes highly reactive chlorine atoms These chlorine atoms in the stratosphere cause the depletion of the ozone layer
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Water, oils and detergents
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Immiscible liquids, such as vegetable oil and water, form an emulsion when shaken with an emulsifier
Temporary hardness is caused by calcium hydrogen-carbonate, which is removed by boiling. Hardness in water can be removed by passing the water through an ion-exchange column
There are weak inter-molecular forces between molecules of oil. Solvent molecules make inter-molecular forces with molecules of grease so solvent molecules can surround molecules of grease