Chemistry
Explain the term 'mixture'. Differentiate between homogeneous & heterogeneous mixtures. State why brass is considered as a homogeneous mixture while a mixture of iron & sulphur - heterogeneous. Give an example of two liquids which form (a) homogeneous (b) heterogeneous mixtures.
Elements, Compounds & Mixtures
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Answer
A mixture is made up of two or more substances — elements or compounds or both — mechanically mixed together in any proportion.
Difference between homogeneous and heterogeneous mixtures:
| Homogeneous mixtures | Heterogeneous mixtures |
|---|---|
| Constituents - uniformly mixed | Constituents - not uniformly mixed |
| Properties & composition - same throughout the mixture | Properties & composition vary throughout the mixture |
Brass is considered as a homogeneous mixture because:
- The constituents are uniformly mixed and
- Properties and composition are same throughout the mixture.
A mixture of iron & sulphur is considered a heterogeneous mixture because:
- The constituents are not uniformly mixed and
- Properties and composition vary throughout the mixture.
(a) Two liquids forming homogeneous mixture : Alcohol and Water
(b) Two liquids forming heterogeneous mixture : Oil and Water
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