Elements, Compounds and Mixtures

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What is an element?
An element is a substance that contains only 1 type of atom
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What is a Compound?
A compound is a substance made up of 2 or more different types of atom, held together by chemical bonds
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What is a molecule?
2 or more atoms held together by chemical bonds
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What is an atom?
The simplest particle of an element that can exist on its own
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Give the definition of a diatomic molecule
A diatomic molecule is a molecule containing 2 identical atoms covalently bonded.
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Give 2 examples of a diatomic molecule
Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine and Iodine
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Give 2 properties of Metals (metallic elements)
1) Good Conductors 2)Good conductors of heat 3)All are solids at room temp. except mercury 4)High density 5)High melting and boiling points 6)malleable and ductile 7)Lustrous 8)Sonorous
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What does malleable mean?
Easily hammered into shape
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Give 2 Non- Metallic properties
1) Poor conductors or electricty (except carbonin the form of graphite) 2) Poor conductors of heat 3)Low density 4) Low melting and boiling points 5)Not sonorous
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What can be seen when Iron filings and Sulfur are mixed?
A red glow (heat is also given out(exothermic) (black solid formed)
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Name 1 method commonly used to separate a solid from a liquid
1) Filtering 2)Evaporating 3)Crystallizing 4)Centrifuging
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name 1 method that can be used to separate a solvent from solution
1)Simple distillation 2)Fractional distillation 3)Separating funnel
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How would you separate a mixture of coloured substances
Chromatography
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Why is the base line drawn in pencil in Chromatography?
To prevent the colours in the line mixing with the substances to be separated
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Other cards in this set

Card 2

Front

What is a Compound?

Back

A compound is a substance made up of 2 or more different types of atom, held together by chemical bonds

Card 3

Front

What is a molecule?

Back

Preview of the front of card 3

Card 4

Front

What is an atom?

Back

Preview of the front of card 4

Card 5

Front

Give the definition of a diatomic molecule

Back

Preview of the front of card 5
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