A substance made up of only one type of atom e.g. Hydrogen
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What is a mixture?
When 2 or more elements are not chemically joined
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What is a compound?
When two or more elements are chemically joined.
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How much of the air is made up of nitrogen?
70%
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How much of the air is made up of oxygen?
21%
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What is the overall charge of an atom?
Neutral
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What charge do protons have?
Positive
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What charge do neutrons have?
Negative
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What charge do electrons have?
Negative
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What are the three parts to fractional distillation?
Boiling, evaporating and condensing
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What does miscible mean?
Describes liquids that dissolve each other, mixing completely. They don't form separate layers that are seen in mixture of immiscible liquids that have settled.
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What is chromatography?
A technique to separate and identify substances from mixtures in solutions of different compounds.
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Why do we use pencil instead of pen for the chromatography line?
Ink is soluble and its components will break down whereas the graphite in pencil will not.
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What makes up an atom?
Inside is the heaviest part named the nucleus. Inside the nucleus are two sub-atomic particles called protons and neutrons. Outside the nucleus, spinning around in orbits, are electrons.
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How do you work out how many protons are in an atom?
The atomic number determines how many protons there are.
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How do you work out how many electrons there are?
The atomic number, showing the protons, is the same as the number of electrons.
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How do you work out how many neutrons there are?
The mass number (big number) - the atomic number (smaller number)
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