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What is meant by a substance?

A substance is a type of matter that has a uniform and definite composition. This means it is made up of only one kind of particle throughout. Substances can be either:

  • Elements – Made of only one type of atom (e.g., oxygen, copper).
  • Compounds – Made of two or more elements chemically combined in a fixed ratio (e.g., water, carbon dioxide).

Substances have consistent properties such as boiling point, melting point, and density. Unlike mixtures, their composition does not vary from sample to sample.

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More Questions on Is Matter Around Us Pure ?

  1. State the properties of a suspension.
  2. How can you convert saturated solution into unsaturated or vice-versa?
  3. What is “solubility” of a solute?
  4. Why is crystallisation a better technique than the evaporation process?
  5. What is crystallisation? Why is crystallisation used?
  6. What is chromatography? What are its various applications and underline the basic principles involved?
  7. What is aerosol?
  8. What is emulsion?
  9. What is Tyndall effect?
  10. Why water is called universal solvent?
  11. How would, you confirm that a colourless liquid given to you is pure water?
  12. Classify each of the following as a homogeneous or heterogeneous mixture: soda water, wood, air. soil, vinegar, filtered tea.
  13. Write the steps you would use for making tea. Use the words, solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
  14. Try segregating the things around you as pure substances or mixtures
  15. What type of mixtures are separated by the technique of crystallisation?
  16. How will you separate a mixture containing kerosene and petrol (difference in their boiling points is more than 25°C), which are miscible with each other?
  17. To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.
  18. How are sol, solution and suspension different from each other?
  19. Differences Between Homogeneous and Heterogeneous Mixtures.
  20. What is meant by a substance?