Meaning Of Words

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ELEMENT
Substance containing only ONE type of atom.
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COMPOUND
A substance made when 2 or more elements join together.
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PRECIPITATE
A solid substance that comes out of a solution during a chemical reaction.
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EXOTHERMIC//ENDOTHERMIC
EXOTHERMIC: Reaction that gives out energy ENDOTHERMIC: Reaction that takes in energy
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CATALYST
Speeds up chemical reaction, but DOES NOT GET USED UP. Can be recovered afterward and will be chemically unchanged.
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ENZYME
BIOLOGICAL catalyst (does the same as normal but in a living thing)
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GROUPS ON PERIODIC TABLE
HALOGENS (group 1) ALKALI METALS (group 7) NOBLE GASES (group 0) TRANSITION METALS (block in centre)
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ATOMIC NUMBER
number of protons and electrons in atom
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MASS NUMBER
protons + neutrons
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ISOTOPE
atoms of same element but with different number of neutrons
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IONS
atoms after they have gained or lost an electron(s)
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DIATOMIC MOLECULES
contain TWO atoms
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COVALENT BOND
bond where 2 atoms share electrons (single covalent bond is sharing two electrons, double is four etc)
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CHEMICAL FORMULA
gives number of atoms of each element present in in substance eg
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FUEL
substance that burns thus releasing energy
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FRACTION
group of substances with similar boiling points (crude oil)
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Other cards in this set

Card 2

Front

A substance made when 2 or more elements join together.

Back

COMPOUND

Card 3

Front

A solid substance that comes out of a solution during a chemical reaction.

Back

Preview of the back of card 3

Card 4

Front

EXOTHERMIC: Reaction that gives out energy ENDOTHERMIC: Reaction that takes in energy

Back

Preview of the back of card 4

Card 5

Front

Speeds up chemical reaction, but DOES NOT GET USED UP. Can be recovered afterward and will be chemically unchanged.

Back

Preview of the back of card 5
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