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Why is a Combustion reaction an oxidation reaction? Identify the type of chemical reaction (i) A + B → C (ii) A + BC → AC + B
Why cannot a chemical change be normally reversed? Identify the substance oxidized and reduced in the reaction. CuO ( s ) + Zn( s ) → ZnO ( s ) + Cu ( s )
When you mix solutions of lead (II) nitrate and potassium iodide, (a) What is the colour of the precipitate formed? Name the compound evolved? (b) Write a balanced chemical reaction? (c) Is this a double displacement reaction?
Transfer the following into chemical equations and balance them. (1) Hydrogen gas combines with nitrogen to from ammonia. (2) Hydrogen sulphide gas burns in air to give water and sulphurdioxide. (3) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
Balance the equations (1) HNO3 + Ca (OH ) 2 → Ca ( NO3 ) 2 + H 2O (2) NaCl + AgNO3 → AgCl + NaNO3 (3) BaCl2 + H 2 SO4...