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42 Cards in this Set
- Front
- Back
Food Additivies.
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1) Antioxidants.
2)Colours. 3)Emulsifiers. 4)Flavour enhancers. |
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Antioxidants.
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Stop food from reacting with oxygen and turning bad.
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Ascorbic Acid
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(common name of a vitamin)
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Enhance
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Additives and sweetners are used to enhance.
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Toxicity
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Something that toxic , danger Etc: poison
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Active Packaging
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Actively changes the condition of packaged food to extend it life while maintaining the quality of the products.
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Intelligent packaging.
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Monitors the condition of packaged food and gives information on the quality of the packaged food using sensors and indicators.
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Catalyst
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Speeds up a reaction.
Causes a change. |
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Detergent
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Hooks between oil and water
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Emulsion
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helps to break up fats and oils.
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What happens when food is cooked?
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chemicals change and change is irreversible
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What happens to a protein molecule when it is heated?
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it becomes denatured
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What is the chemical name of baking powder?
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sodiumhydrogencarbonate
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What is used in baking powder to make it rise?
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yeast
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When sodiumhydrogencarbonate decomposes it gives off what 3 things?
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sodium carbonate
carbon dioxide water |
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polymer
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a molecule with many repeating subunits such as starch
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emulsion
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when oil is 'hooked' onto water and pulled off-- used in dishwashing process, milk is an emulsion too
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colloid
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a mixture in which small particles of one substance are suspended in another; car exhaust
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two differnet names of smells
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pungent is a bad odor
scent is sweet |
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2 ways to make perfume
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distilled
synthetic (chemical boiled to make an ester) |
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how to make an ester
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alcohol + acid-> ester + water
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volotile
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when a liquid evaporates easily
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diffusion
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when gas particles move through air
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examples of esters
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nail varnish, perfume
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soluble
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a substance that disolves in a liquid; eg: sugar
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solvent
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the liquid that the thing disolves in
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solute
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same as soluble
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solution
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a solute and solvent that do not separate
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emulsifier
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chemical that helps break up fats; used in washing detergent
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hydrophilic head
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a water loving part of an emulsifying molecule
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hydrophobic tail
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water hating part of an emulsifying molecule that attracts oil
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What is test for carbon dioxide?
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pass gas through limewater and if it changes from colourless to cloudy then carbon dioxide is there
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decomposition reaction formula
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heat
sodium hydrogencarbonate -> sodium carbonate + carbon dioxide + water |
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catalyst
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a chemical that speeds up a reaction
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name 3 fossil fuels
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coal, gas, oil
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How are fossil fules made?
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They are dead animals and plants squashed together over milions of years
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What do dead plants form?
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coal
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What do dead animals make?
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crude oil
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fractional distillation
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sepparating crude oil by heating up, then cooling down. Each fraction has different boiling points
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finite resourses
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fossil fuels that are no longer being made
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non-renewable
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sources cannot be made again
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cracking
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breaking down big molcules into smaller molecules which can be used for more things; eg: paraffin can be broken down to petrol
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