Chemistry
What do you understand by a 'chemical reaction'?
Chemical Reaction
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Answer
A chemical reaction is a process of breaking chemical bonds of the reacting substances (reactants) and making new bonds to form new substances (products).
Example : BaCl2 (aq) + H2SO4 (aq) ⟶ BaSO4 (s) + 2HCl (aq)
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Why does the blue colour of copper sulphate solution fade on adding iron fillings ?
Give an example of:
(a) Single displacement reaction
(b) Double displacement reaction
(c) Photochemical reaction
(d) Thermal decomposition reaction
(e) Electrolytic decomposition reaction
(f) Combination reaction between two compounds ?
Give an example of each of the following chemical changes.
(a) A reaction involving
(i) change of state
(ii) formation of a precipitate
(b) An exothermic and an endothermic reaction involving carbon as one of the reactants.
(c) A reaction where colour change is noticed.
What is a chemical change? Give two examples of a chemical change?