Year 9 Chemical Reactions Revision Answers PDF

**Year 9 - Chemical Reactions Revision ANSWERS** 1. 2. 3. 4. 5. 6. +-----------------------+-----------------------+-----------------------+ | *Endo* |  | *Endo* | | | *Exo* |...

**Year 9 - Chemical Reactions Revision ANSWERS** 1. 2. 3. 4. 5. 6. +-----------------------+-----------------------+-----------------------+ | *Endo* |  | *Endo* | | | *Exo* | | +=======================+=======================+=======================+ |  | *Endo* |  | | | | | | *Exo* | | *Endo* | +-----------------------+-----------------------+-----------------------+ 7. +-----------------------+-----------------------+-----------------------+ | | Acid | Base | +=======================+=======================+=======================+ | Taste | *sour* | *bitter* | +-----------------------+-----------------------+-----------------------+ | pH levels | *1-6* | *8-14* | +-----------------------+-----------------------+-----------------------+ | Colour in universal | Weak acid: | Weak base: *blue* | | indicator | *green/yellow* | | | | | Strong base: *purple* | | | Strong acid: *red* | | +-----------------------+-----------------------+-----------------------+ | Examples | - - - - | - - - - | +-----------------------+-----------------------+-----------------------+ 8. 9. 10. 11. 12. 13. 14. 15. - - - 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. **Neutralisation (Ex 6.3)** ----------------------------- ------------------------------------------------------------------ Worded equation *acid + base → salt + water* Example worded equation *hydrochloric acid + sodium hydroxide → sodium chloride + water* **Acid and Metal carbonate (Ex 6.3)** --------------------------------------- -------------------------------------------------------------------- Worded equation *acid + metal carbonate → salt + water + carbon dioxide* Example worded equation *citric acid + sodium bicarbonate → salt + water + carbon dioxide* **Acid and Metal (Ex 6.4)** ----------------------------- ----------------------------------------------------------------- Worded equation *acid + metal → salt + hydrogen* Example worded equation *magnesium + hydrochloric acid → magnesium chloride + hydrogen* **Metal and Oxygen (Ex 6.3)** ------------------------------- ---------------------------------------- Worded equation *metal + oxygen → metal oxide* Example worded equation *magnesium + oxygen → magnesium oxide* **Non-metal and Oxygen (Ex 6.3)** ------------------------------------ ------------------------------------ Example worded equation (Hydrogen) *hydrogen + oxygen → water* Example worded equation (Carbon) *carbon + oxygen → carbon dioxide* +-----------------------------------+-----------------------------------+ | **Combustion (Ex 6.3)** | | +===================================+===================================+ | Worded equation | *fuel + oxygen → carbon dioxide + | | | water OR* | | | | | | *hydrocarbon + oxygen → carbon | | | dioxide + water* | +-----------------------------------+-----------------------------------+