Chemistry end of Yr7 summer exam

  • Created by: ams9
  • Created on: 24-05-18 18:54
Chromatography
When a piece of filter paper is dipped in a shallow pot of water and as the water comes up the paper it separates the felt tip colours
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Distillation
The process of water being evaporated and then condensed in order to separate it from another fluid e.g. ink and water
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Filtration and Evaporation
The process used to separate products like rock salt, where the salt is first crushed, dissolved then filtered and evaporated.
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The 3 main gases in air
Nitrogen(78%), Oxygen(21%), Argon(0.9%)
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When Magnesium burns
It creates a bright, white light. During combustion, it combines with oxygen to make magnesium oxide.
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What happens when a going out splint is put in pure oxygen?
It relights.
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What happens when carbon dioxide mixes with limewater?
The Limewater goes cloudy
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What happens when a lit splint has contact with pure hydrogen?
A loud pop and a bright flash
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What are fuels?
They are chemicals that give out energy when burnt. They combine with oxygen
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What are the main products of combustion?
Carbon Dioxide(CO2) and Water(H2O)
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What are 2 secondary products of combustion?
Soot(Carbon) and Carbon Monoxide(CO)
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What is a Compound
A compound is a substance with 2 or more elements combined together.
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2 Element compounds are...
If 2 elements are present then the compound ends in -ide and if a metal is present it comes 1st.
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The first 20 elements are...
H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, Ph, S,Cl, Ar, K, Ca
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How do you get different flames on a Bunsen?
For a orange safety flame, you have the air hole wide open, for the medium blue, it is partially shut. and for the roaring blue, no air is getting to the source of flame.
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Particle Arrangements.
If the particles are tightly packed, they're a solid, if they're loose they're a liquid and if they're far apart its a gas.
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Melting
When a solid changes to a liquid
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Evaporating
When a liquid changes to a gas.
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Condensing
When a gas changes to a liquid.
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Freezing
When a liquid changes to a solid
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Sublimation
The process when solids change straight to a gas without the stage of liquid.
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What happens when ice is heated.
when ice starts to melt, the temperature doesn't rise much as when the ice is melting it is using up lots of energy, meaning not much is used for temperature. This is the same for when its boiling and turning into a gas.
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Air Pressure
When gas is squashed into the container, the particles bounce off the walls a lot more. When gas particles bump into the walls of the container, they cause pressure. the more particles that hit the walls, the higher the pressure
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Solute
The substance that dissolves.
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Solvent
The liquid in which the substance dissolves.
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Solution
The Solute and Solvent mixed together.
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Saturated
When no more solute can dissolve, the liquid is saturated.
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Crystallisation
The process of a saturated solution drying out, making crystals.
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Other cards in this set

Card 2

Front

Distillation

Back

The process of water being evaporated and then condensed in order to separate it from another fluid e.g. ink and water

Card 3

Front

Filtration and Evaporation

Back

Preview of the front of card 3

Card 4

Front

The 3 main gases in air

Back

Preview of the front of card 4

Card 5

Front

When Magnesium burns

Back

Preview of the front of card 5
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