Pure and impure substances
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What is an elememt?
A pure substance that cannot be broken down into simpler instances by chemical or physical means.
What is a compound?
A pure substance that can be broken down into simpler substances by chemical means.
What are mixtures?
Two or more elements and/or compounds NOT chemically combined. Can be seperated by physical means.
Elements and compounds are ….. substances.
Pure
Mixtures are ….. substances.
Impure
Name the five ways of separating mixtures.
• hand sorting • sieve/filter • magnet (magnetic substances) • evaporation • distillation
What are compounds made up of?
Two or more atoms of different elements.
What is a chemical bond?
An electronic force of attraction between atoms.
What are the three main types of chemical bonds?
• metallic bond: between metal atoms. • covlent bond: between non-metals atoms. • ionic bond: between metal and non-metals.
When atoms combine to form a particular compound, they always do so in a …….. ……..
Constant ratio