1) The indicator for sugar is called a) benedict's b) iodine c) biuret's d) sudan III 2) Benedict's show a positive result when it turns a) blue b) purple c) red 3) Iodine is an indicator for a) sugar b) starch c) protein d) lipids 4) 'Lipid' is the scientific word for... a) protein b) sugar c) carbohydrate d) fat 5) If starch is present then iodine turns... a) blue / black b) purple c) green d) orange 6) Benedict's solution will not change colour unless... a) The solution is shaken up b) The solution is stirred c) The solution is heated in a hot water bath d) The solution is placed in an ice bath 7) Biuret's solution is made from... a) Hydrochloric acd b) Copper sulfate c) Copper sulfate and sodium hydroxide d) Sodium thiosulfate 8) Lipids should be tested for using.. a) Benedict's b) Iodine c) Biuret's d) Ethanol e) Ethanol & water 9) Ethanol and water give a positive result for lipids by... a) Forming an orange layer above the food b) Foming an green layer above the food c) Forming an blue layer above the food d) Forming an lilac layer above the food e) Forming a 'milky'emulsion 10) If protein is NOT present in a food then biuret's solution will stay... a) Black b) Blue c) Green d) Purple

Food tests

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