ICSE Worksheet for Chapter - 3 Elements, Compounds, Mixtures Class 8

Worksheets For class 8

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Summary

1. Classification of matters.
2. Elements – metals and non-metals.
3. Compounds – (its comparative study with element), its characteristics.
4. Mixtures – Homogeneous and heterogeneous.
5. Separation of the mixture.

• Solid + Solid

1. Sublimation
2. Magnetic separation
3. Solvent extraction

• Solid + Liquid

1. Filtration
2. Sedimentation
3. Evaporation
4. Distillation

• Liquid + Liquid

1. Separating funnel
2. Fractional distillation

Section-1

1. Q1. What are metalloids? Name a few metalloids with their symbols.
2. Q2. Classify the following as elements, mixtures and compounds :
3. Sugar, marble, distilled water, paint, tap water, alcohol, bread, brass, nitre, washing soda, soap, air, mercury, wax, rust, seawater.
4. Q3. Complete the following sentences with appropriate terms such as Evaporation, filtration, distillation, fractional distillation, sublimation, methylated spirit, immiscible, separating funnel.
   1. Ammonium chloride is separated from a mixture of sodium chloride and ammonium chloride by the process of _______________.
   2. When sodium hydroxide is added to ferric chloride solution, a reddish brown precipitate is formed. The precipitate is separated from the mixture by the process of ________________.
   3. Benzene and water can be separated by _______________
   4. Pure iodine can be obtained by the process of __________________
   5. Greasy spots can be removed from clothes by __________________

Section-2

1. Q4. Name three different methods in each case for the separation of :
   1. Solid-solid mixtures
   2. Solid-liquid mixtures
   3. Liquid-liquid mixtures
   4. Give one example in each case
2. Q5. Give examples of the following types of mixture and state whether they are homogeneous or heterogeneous :
   1. Two solids
   2. A solid in liquid
   3. Liquid
   4. Liquid in gas
3. Q6. Give reasons for the following assertions.
   1. Ammonia is a compound
   2. Air is a mixture, not a compound
   3. Tap water is a mixture, not a compound
4. Q7. Explain the differences with relevant examples –
   1. Elements and compounds
   2. Compounds and mixtures.
5. Q8. How do you understand by atomicity of elements? Explain giving examples.
6. Q9. State four differences between metals and non-metals along with the exceptions.
7. Q10. Explain metalloids with examples.