3 Mark of Elements and Compounds

 20 three-mark questions on the topic "Elements and Compounds" in the Basics of Chemistry:

  1. Define an element and give two examples.
  2. Explain the difference between elements and compounds with one example for each.
  3. Describe three characteristics of metals as elements.
  4. What are nonmetals? List three properties of nonmetals.
  5. Differentiate between metals and nonmetals based on conductivity, malleability, and luster.
  6. What are metalloids? Give two examples and their characteristics.
  7. How are elements organized in the Periodic Table, and what information does it provide about elements?
  8. Define a compound and give two examples, explaining how they differ from mixtures.
  9. Explain why water (H₂O) and carbon dioxide (CO₂) are considered compounds.
  10. Describe the process of forming a compound with an example.
  11. What is a chemical formula? Write the chemical formulas of water, methane, and sodium chloride.
  12. Explain how atoms in a compound are bonded together with an example.
  13. Differentiate between ionic and covalent compounds with examples.
  14. Describe the composition and structure of a molecule of oxygen (O₂) and a molecule of nitrogen (N₂).
  15. What are diatomic elements? Give two examples and explain their stability.
  16. How are compounds classified based on their properties? Give an example for each type.
  17. Explain why the properties of a compound are different from those of its constituent elements, with an example.
  18. Describe three methods used to separate compounds into their elements or simpler substances.
  19. What is meant by the law of constant composition? Explain with an example.
  20. Discuss the importance of compounds in daily life, providing two examples and their uses.

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