Question

CHECK POINT 2
1. Separate the following pure substances as elements and compounds:
Diamond, oxygen, sodium chloride, graphite, distilled water
2. Classify the following as compounds and mixtures:
Air, sugar, tap water, brass, copper sulphate, gasoline
3. Classify the following as homogeneous and heterogeneous mixtures:
(1) sodium chloride in water
(ii) glucose in water
(1) sand and water
(iv) air
4. Justify that water is a compound but not a mixture of hydrogen and oxygen.​

Answer 1

Answer:

diamond,oxygen,graphite-elements

sodium chloride,distilled water-compounds

air,tap water,gasoline-mixtures

sugar,brass,coppper sulphate-compounds

1,2-homogenous

3,4-heterogenous

because it cannot be separated by physical methds

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Explanation:

Answer 2

Answer:

1. Diamond, Oxygen, Graphite are elements.  2. Sodium chloride, Distilled water are compounds .

-------------------------------------------------------------------------------------------------------------Air, Tap water, Gasoline are mixtures. 2.  Sugar, Brass, Copper sulfate are compounds

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3. Sodium chloride in water is Homogeneous.

2. Glucose in water is Homogeneous.

3. Sand and water are Heterogeneous.

4. Air is Homogeneous.

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4. (i) The two elements hydrogen (H) and oxygen (O) are combined chemically to form water (H2O) which boils at a fixed temperature. (ii) The properties of water are altogether different from the constituting elements. For example, molecular hydrogen (H2) is combustible and molecular oxygen (O2) supports combustion.

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Explanation: