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ICSE Class 8 Elements, Compounds and Mixtures — practice questions

Explore 24 free Elements, Compounds and Mixtures questions in ICSE Class 8 Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Elements, Compounds and Mixtures questions and exercises with answers

Showing questions 1–24 of 24.

Sort pure substances from mixturesRead the answer and worked solution →A blend's ingredients retain their chemical identities. It is a?Read the answer and worked solution →Which pair contrasts compound and mixture composition?Read the answer and worked solution →A salt solution has the same composition throughout. It is?Read the answer and worked solution →Sand settles below water. How is the whole sample classified?Read the answer and worked solution →Which observation supports classifying air as a mixture?Read the answer and worked solution →A sand-water mixture is filtered. What stays on filter paper?Read the answer and worked solution →What passes through ordinary filter paper from salt solution?Read the answer and worked solution →Salt dissolves; chalk does not. Recover both from their dry mix by?Read the answer and worked solution →Chalk residue carries salt solution. Why wash it with clean water?Read the answer and worked solution →Recover sand, salt AND water from their mixture. Use filtration, then?Read the answer and worked solution →Kerosene and water make two layers. Separate them with?Read the answer and worked solution →Which property enables a sieve to separate two dry solids?Read the answer and worked solution →Grains are 0.5 mm and 3 mm wide. Which sieve opening separates them?Read the answer and worked solution →On heating, one solid vaporises directly; sand stays. Use?Read the answer and worked solution →Recover dry, heat-stable salt from salt water; water is not needed. Use?Read the answer and worked solution →Obtain liquid water from salt water while retaining the salt. Use?Read the answer and worked solution →In distillation, what is the condenser's main job?Read the answer and worked solution →Distil miscible liquids apart (boiling at 70 C/74 C). Use?Read the answer and worked solution →A fractionating column improves separation mainly by providing?Read the answer and worked solution →Simple distillation of salt water separates by a difference in?Read the answer and worked solution →Which method separates dissolved ink dyes by travel along paper?Read the answer and worked solution →Why can paper chromatography separate dissolved dyes?Read the answer and worked solution →Fine suspended particles settle slowly. Which method speeds density separation?Read the answer and worked solution →

Worked practice questions

Sort pure substances from mixtures

Read exercise and reference answers
Items
  1. Item
    Iron (Fe)
    Answer
    left
  2. Item
    Water (H₂O)
    Answer
    left
  3. Item
    Salt (NaCl)
    Answer
    left
  4. Item
    Air
    Answer
    right
  5. Item
    Brass
    Answer
    right
  6. Item
    Sea water
    Answer
    right
Categories
Left
Element / Compound
Right
Mixture
Instructions
Swipe each sample left for Element / Compound or right for Mixture.

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A blend's ingredients retain their chemical identities. It is a?

  1. An element
  2. One molecule
  3. A compound
  4. A mixture
Show answer and solution

Correct answer: D. A mixture

A mixture combines substances physically while its ingredients retain their chemical identities.

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Which pair contrasts compound and mixture composition?

  1. Variable; variable
  2. Fixed; fixed
  3. Fixed; variable
  4. Variable; fixed
Show answer and solution

Correct answer: C. Fixed; variable

A compound has a definite chemical formula, whereas the proportions of a mixture's ingredients can vary.

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