Concept explainers
(a)
Interpretation:
Helium has to be classified as an element, a compound or a mixture. The mixture has to be identified as homogeneous or heterogeneous.
Concept Introduction:
Element:
When a substance cannot be broken down into simpler substances by chemical means, it is said to be an element.
Compound:
When a substance can be broken down into simpler substances by chemical means, it is said to be a compound.
Mixture:
The combination of two or more substances which can be separated by the differences in the physical properties of the substances is said to be a mixture.
Homogeneous mixture:
If the composition of mixture is uniform throughout, then it is said to be homogeneous mixture.
Heterogeneous mixture:
If the composition of mixture is changed from one part to another, then it is said to be heterogeneous mixture.
(b)
Interpretation:
A muddy river has to be classified as an element, a compound or a mixture. The mixture has to be identified as homogeneous or heterogeneous.
Concept Introduction:
Refer to part-a.
(c)
Interpretation:
Window glass has to be classified as an element, a compound or a mixture. The mixture has to be identified as homogeneous or heterogeneous.
Concept Introduction:
Refer to part-a.
(d)
Interpretation:
Paint has to be classified as an element, a compound or a mixture. The mixture has to be identified as homogeneous or heterogeneous.
Concept Introduction:
Refer to part-a.
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Chemistry: Principles and Practice
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