GRADE 10 CHEMISTRY CROSSWORD

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Across
  1. 1. A bond formed when atoms share electrons (Hint: Non-metals are involved)
  2. 3. A reaction where two or more simple substances combine to form a more complex one (Hint: A + B → AB)
  3. 4. A reaction where a compound reacts with oxygen, producing heat and light (Hint: CH₄ + O₂ → CO₂ + H₂O)
  4. 7. A process that results in a change in appearance but not chemical identity
  5. 8. A bond formed by the transfer of electrons from a metal to a non-metal
  6. 9. The prefix used for naming a molecule with four atoms of the same element
  7. 10. The scale used to measure the acidity or basicity of a solution
  8. 11. The chemical formula for a compound with one carbon and four chlorine atoms
  9. 13. A reaction where parts of two ionic compounds switch places (Hint: AB + CD → AD + CB)
  10. 14. A substance that changes color in response to pH, like litmus paper
  11. 16. A subatomic particle found in the valence shell and key in bonding
  12. 18. The subatomic particle found in the nucleus that carries no charge
  13. 19. This law states that mass is conserved before and after a chemical reaction
Down
  1. 2. This molecule consists of two oxygen atoms and is essential for combustion and respiration
  2. 5. A reaction where a more reactive element displaces a less reactive one (Hint: A + BC → AC + B)
  3. 6. A reaction where a single compound breaks down into simpler products (Hint: AB → A + B)
  4. 7. The atomic number of an element corresponds to the number of these subatomic particles
  5. 12. A substance with a pH less than 7, such as vinegar
  6. 15. A formula that is not yet fully balanced
  7. 17. A common gas produced in combustion reactions that we exhale