two 3. All the important concepts and examples of senior one chemistry (such as isomers...)

1. Test of sulfate ion: BaCl2 + Na2SO4 = BaSO4 ↓ + 2nacl2, test of carbonate ion: CaCl2 + Na2CO3 = CaCO3 ↓ + 2nacl3, reaction of sodium carbonate with hydrochloric acid: Na2CO3 + 2HCl = 2nacl + H2O + CO2 ↑ 4, reduction of copper oxide by charcoal: 2CuO + C, high temperature 2Cu + CO2

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20. 1+2+3+4+5.+95+96+97+98+99＝?