Elements, mixtures and compounds

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What is an element
The simplest form of a substance that cannot be split ino anything simpler
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What is a compound?
Two or more substance chemically joined or combined via a chemical reaction that are not easily separated
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What is a mixture?
Two or more substances not chemically combined that are easily separated
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What is an atom?
The simplest particle from which all matter is composed
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What is a molecule?
Two or more atoms chemically joined or combined
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What happens in a chemical reaction?
New substances are formed
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What happens in a physical change?
No new substances are formed
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What is conserved in both types of change?
Mass
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What happens during a chemical reaction?
Atoms can be neither created nor destroyed
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What is thermal decomposition?
breaking down of a substance using heat
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What is precipitation?
the formation of an insoluble substance from two soluble substances
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What is neutralisation?
the reaction between an acid and an alkali
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What is direct combination?
the formation of a compound directly from its elements
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What is exothermic?
a reaction that gives out heat
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What is enothermic?
a reaction that takes in heat
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What happens when metals burn in oxygen?
They form oxies, these dissolve in water to form alkalis
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What happens when non metals burn in oxygen?
Teh form oxides, these dissolve in water to form acids
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What are the three elements required for a fire?
Oxygen, Heat and Fuel
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What is combustion?
The term for a substance burning. When burning, a fuel reacts with oxygen in the air
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What happens when hydrogen combusts?
Water is formed
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Water turns cabalt chloride paper what colour?
Blue to pink
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What happens if a fuel contains both hydrogen and carbon?
It will produce water and carbon dioxide as it burns
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What do you call fuels containing both hydrogen and carbon?
Hydrocarbons
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Card 2

Front

What is a compound?

Back

Two or more substance chemically joined or combined via a chemical reaction that are not easily separated

Card 3

Front

What is a mixture?

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

What is a molecule?

Back

Preview of the front of card 5
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