english crossword

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Across
  1. 3. Which substance speeds up a reaction?
  2. 4. What is the smallest particle of an element?
  3. 7. What is the negatively charged particle in an atom?
  4. 10. Which family of elements includes helium?
  5. 11. Where are electrons located in an atom
  6. 13. Candle wax is mainly a compound consisting of two elements that is hydrogen and Y. Give the name of Y.
  7. 15. What is the pH of a neutral solution?
  8. 16. Name the process in which a salt loses its water of crystallisation to air without heating.
  9. 17. Graphite is an allotrope of carbon. Name another element which exhibits allotropy.
  10. 18. Which colourless liquid changes cobalt (II) chloride from blue to pink?
  11. 19. Which bond involves transfer of electrons from one atom to another atom?
Down
  1. 1. Name the apparatus that can be used to store and keep substances free from moisture
  2. 2. During laboratory preparation of oxygen, manganese (IV) oxide is added to reagent H. Name reagent H.
  3. 5. Which gas is produced when zinc reacts with dilute hydrochloric acid?
  4. 6. Which gas supports combustion?
  5. 8. Which bond involves sharing of electrons?
  6. 9. What is the positively charged electrode called?
  7. 12. Which flame is very sooty?
  8. 14. What is the process of removing oxygen from a substance called?