Chemistry end of Yr7 summer exam

  • Created by: ams9
  • Created on: 24-05-18 18:54
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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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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When a solid changes to a liquid
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When a liquid changes to a gas.
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When a gas changes to a liquid.
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When a liquid changes to a solid
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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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The substance that dissolves.
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The liquid in which the substance dissolves.
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The Solute and Solvent mixed together.
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When no more solute can dissolve, the liquid is saturated.
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The process of a saturated solution drying out, making crystals.
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Card 2




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

Card 3


Filtration and Evaporation


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Card 4


The 3 main gases in air


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Card 5


When Magnesium burns


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