Burning of a candle is a chemical change.

Solve the crossword puzzle with the help of the given clues.

ACROSS
1. Colour of copper sulphate crystals. (4)
2. Chemical reaction that takes place in our body. (9)
3. Iron and copper containers made safe for storing foodstuff. (7)
4. Its presence is required for rusting to take place. (8)
5. Solution left behind after separating the crystals. (12)
DOWN
6. Solids on heating form vapour and the vapour on cooling gives pure solid back. (11)
7. Formation of brown powdery substance on iron surface in the presence of moist air. (7)
8. Metal that protects iron from rusting. (4)
9. A property of the physical change. (10)
10. Metal electroplated on bathroom fittings. (8)
11. A process that produces heat and light. (7)