CHEMISTRY PAPER 2 FLASH CARDS AQA

Flash cards with answers at the back - test yourself! Good revision summary on all topics

Why is a carboxylic acid a weak acid?
It has a higher pH with less concentration of h+ ions. Its a weak acid because they do not ionise completely. When you react it with a metal carbonate it gives of CO2 slowly.
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What are the properties of long chains?
Higher boiling points. Lower volatility. Thick viscosity. Not very flammable.
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What natural resources are used to make products?
Metal ores to extract metals. Crude oil to make polymers and petrol chemicals. Limestone to make concrete and cement. Crude oil to make petrol, diesel, and kerosene which we use for transport.
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How is water made safe to drink? Brief process
Resevoir --- special filters --- treatment works --- screens of bar metals --- settlement tanks --- aluminium sulphate and lime added do dirt clumps together --- chlorine added to kill bacteria --- ozone /UV light --- pH of water checked
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What do life cycle assessments assess on the environment? (causes)
Impact on environment caused by getting&processing raw materials, making and packaging a new product, using/reusing&maintaing the product, disposing the product and total energy needed
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Why does raising the temperature increase the rate of reaction?
Theres more frequent collisions in a given time pecause the particles are colliding in high speed due to the gain in kinetic energy from thermal energy. More successfull collisions in a given time. Increasing a reaction by 10* roughly doubles rate
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What are the effects of catalysts? and their good properties?
Speed up reactions. Not used up in a reaction so they can be re-used. Decrease activation energy needed for reaction to begin. They work by giving the reaction an alternative pathway to products. Renewable. Save money. Helps envo
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What is dynamic equilibrium?
Exists only once in a reaction. Substances move between the chemicals at an equal rate. Example of a system at a steady rate. Exists in a reversible reaction.
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What are the differences in addition polymerisation (AP) and condensation polymerisation? (CP)
AP produces an addition polymer where as CP produces a cp polymer with a small molecule such a water.
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Tests for gases?
Hydrogen test: lighted splint 'pops'. CO2 test: Limewater turns cloudy/milky when co2 is put in with a pipette. Chlorine test: Damp blue litmus paper bleaches to white. Oxygen test: A glowing splint re-lightes.
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Other cards in this set

Card 2

Front

What are the properties of long chains?

Back

Higher boiling points. Lower volatility. Thick viscosity. Not very flammable.

Card 3

Front

What natural resources are used to make products?

Back

Preview of the front of card 3

Card 4

Front

How is water made safe to drink? Brief process

Back

Preview of the front of card 4

Card 5

Front

What do life cycle assessments assess on the environment? (causes)

Back

Preview of the front of card 5
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