C1 Carbon Chemistry [2]

This is the second half of the eight topics of C1

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What is GORE-TEX?
A breathable, lightweight material they keeps out water but lets out sweat. This is because the holes are too small for rain to enter but big enough for sweat to leave.
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Name two properties scientists are trying to create in a polymer.
Soluble and biodegradable
2 of 18
What are the environmental issues about disposing of polymers?
Land-fill site get filled up; land is wasted; buring produces harmful gases; crude oil is wasted; and it is difficult to recycle polyermers.
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Why can some plastics be stretched and melted easily?
Weak intermolecular forces.
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Name one property of plastics with strong forces.
Rigid.
5 of 18
Describe the process of 'denaturing'.
Protein molecules change shape and appearance once heat has been added.
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What happens to carbohydrates when they are cooked?
The cell walls burst because of swelled up starch; giving them a softer texture and better flavour
7 of 18
What is the word equation for the decomposition of sodium hydrocarbonate?
sodium hydrocarbonate ---> sodium carbonate + carbon dioxide + water
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Describe the job of an emulsifier molecule.
The emulsifier molecule has two end - a hydrophilic head and hydrophobic tail. The head bonds with the water molecule and the tail bonds with the oil molecule. The oil molecules then surround the water molecule - keeping the together.
9 of 18
Explain the experiment to make an ester.
An acid is added to an alcohol then heated; a condenser stops gas escaping and cools it down allowing the reaction to go on for longer.
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Name five properties of a perfume.
Evaporate easily; non-toxic; not react with water; not irritate skin; insoluble in water
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What is a solution a mixture of?
A solvent and a solute
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Explain, in terms of kinetic theory, the volatility (evaporation) of a perfume.
Particles need kinetic energy to overcome the forces of attraction. Weak attraction between perfume molecules means less kinetic energy is needed to overcome the attractions.
13 of 18
What is a colloid?
A liquid with dispersed particles but they are not dissolved, eg. paint.
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How do emulsion paints dry?
The water from the wet paint evaporates and the oil forms a protective layer over the pigment particles.
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How do oil paints dry?
The solvent evaporates and the oil is oxidised by the oxygen in the atmosphere
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What can a thermochromic paint be used for?
Show a temperature change on the body; show the temperature of a kettle; show the temperature change for babies objects eg. spoon, bath toy.
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Why do phosphorescent paints glow?
The electrons absorb and store energy when the lights are on; when the lights are turned off thy give out energy in the form of light.
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Other cards in this set

Card 2

Front

Name two properties scientists are trying to create in a polymer.

Back

Soluble and biodegradable

Card 3

Front

What are the environmental issues about disposing of polymers?

Back

Preview of the front of card 3

Card 4

Front

Why can some plastics be stretched and melted easily?

Back

Preview of the front of card 4

Card 5

Front

Name one property of plastics with strong forces.

Back

Preview of the front of card 5
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