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18 Cards in this Set
- Front
- Back
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What is an element?
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an element is a substance made from only one type of atom.
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What is a substance?
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A substance is made from two or more elements which are chemically bonded together.
They cannot be seperated easily. |
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What is a mixture?
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A substance made from two or more elements which are not bonded together.
They can be seperated easily. |
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What is an ion?
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An ion is a particle that is either positively or negatively charged.
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metal + non metal = ?
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ionic bond
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non metal + non metal = ?
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covalent bond
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metal + metal = ?
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metallic bonding
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What is relative atomic mass?
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The mass of an atom of an element relative to the mass of the mass of a 12C atom.
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What is relative molecular mass?
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The mass of a compound/molecule of an element relative to the mass of a 12C atom.
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What is an icotope?
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An atom of an element with a different number of neutrons.
The number of protons stay the same. |
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What does relative molecular mass mean?
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The sum of all of the relative atomic masses in a molecule.
The BIGGEST number is ALWAYS the atomic mass. |
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What is paper chromatography?
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A method of the seperation of mixtures of the different coloured compounds.
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How do you work out RF?
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distance moved by the compound
-------------------------------------------------- distance moved by a solvant |
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What is the solvant front?
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The line at which the solvant reaches.
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What is the difference between paper and gas chromatography?
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Paper chromatography uses coloured compounds and is done with liquids where as gas chromatography uses gas.
Gas chromaography is more accurate. |
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How do you work out percentage composition?
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Ar of the element
------------------------------- x100 Mr of the compound |
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how do you work out percentage Yield?
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actual yield
---------------------------------------- x 100 maximum theoretical yield |
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What is a Yield?
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The yield of a substance is how much there is of it after a chemical reaction.
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