Chemical Reactions and Equations

2. The insoluble solid which settles down after the completion of the chemical reaction
5. A reaction that releases energy in the form of light or heat
7. A reaction in which heat is absorbed from the surroundings
12. A substance which reduces other substances but oxidises itself
15. When two or more reactants combine with each other to form a new product
17. A chemical reaction in which two compounds exchange positive ions and form two new compounds
18. A substance(chemical) which slows down oxidation
19. Substance that speeds up a chemical reaction
20. Hydrated ferric oxide

1. A reaction in which a compound breaks down into two or more simpler substances
3. A type of decomposition reaction in which the reactant will break down in presence of sunlight
4. The reaction in which decomposition occurs by applying electricity
6. The spoiling of food caused by the oxidation of fats and oils present in it
8. A process in which a chemical substance changes because of the addition of oxygen
9. A substance that undergoes change in a chemical reaction
10. deterioration of metals by the reaction of water and oxygen with the formation of an oxide layer on the metal surface
11. Reactions in which oxidation and reduction take place together
13. Equations with simply the chemical formulas of the products and reactants, no mention of state, and no atom balancing on either side of the equation
14. A reaction in which a more reactive element displaces a less reactive element from its compound
16. Coating of zinc over the surface of iron or steel to prevent against rusting