A substance that contains only one type of atom or compound
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What is an impure substance?
A substance that contains more than one substance which then forms a mixture
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What does chromatography do?
It separates dissolved pigments in solution
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What does filtration do?
It separates an insoluble solid from a liquid by passing the solid/liquid mixture through the filter paper
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What is filtrate?
The liquid which passes through the filter paper and the solid left behind is the residue.
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What does evaporation do?
It removes the liquid part of a mixture and collects the dissolved solid
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What does distillation do?
Distillation is a process that can be used to separate a pure liquid from a mixture of liquids.
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What is combustion?
The reaction between a fuel and oxygen
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Formula for combustion
fuel + oxygen = carbon dioxide + water + energy
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What is thermal decomposition?
When compounds break down into new molecules when heated
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What is oxidation?
When substances gain oxygen in a reaction
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What does reduction mean?
Losing oxygen in a reaction
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What does physical change mean?
When a substance changes state. e,g liquid to solid
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What is the left side of an equation called?
reactants
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What is the right side of an equation called?
products
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What is oxidation?
Reacting an element or compound with oxygen
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What are some properties of metals?
- Conduct electricity and heat
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What are some properties of metals?
Conduct electricity and heat, are malleable (can be hammered in to shape), are ductile (can be drawn into wires), are shiny, high melting and boiling point
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What are some properties of non-metals/
Unable to conduct electricity and heat, low melting and boiling point, lower density than metals
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What is combustion?
Where a fuel reacts with oxygen forming carbon dioxide and water.
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What is sublimation?
The change from a solid to a gas or from a gas to a solid
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What is diffusion?
The name of the process whereby molecules in a liquid or gas mix as a result of their random motion
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What is kinetic energy?
Movement energy. The more movement, the more energy
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What is an exothermic reaction?
A reaction that produces heat energy
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What is an endothermic reaction?
A reaction that takes in energy from the environment
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What is a catalyst?
A substance that reduces the activation energy and increases the rate of reaction
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What is an indicator used for?
To find out what type of substance a chemical is
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What is neutralisation?
A reaction in which acidity or alkalinity is removed, In all neutralisation reactions water is made
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What is the order of reactivity? (From the most reactive)
When one metal is more reactive than the other it will displace it, If the metal in the compound is lower in the reactivity series than the introduced metal or carbon then the introduced metal will displace the metal in the compound
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Other cards in this set
Card 2
Front
What is an impure substance?
Back
A substance that contains more than one substance which then forms a mixture
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