Chemistry
State the main characteristics of chemical reactions. Give at least one example in each case.
Chemical Reaction
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Answer
The main characteristics of chemical reactions are :
Evolution of gas
Zn(NO3)2 4NO2 + 2ZnO + O2 ↑Change of colour
Change of state
2H2O (l) 2H2 (g) + O2 (g)Formation of precipitate
NaCl (aq.) + AgNO3 (aq.) ⟶ AgCl (white ppt.) ↓ + NaNO3 (aq.)
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Related Questions
Complete and balance the following reactions:
(a) NaCl (aq.) + AgNO3 (aq.) ⟶
(b) Pb(NO3)2 + KI ⟶
(c) CuCO3
(d) Pb(NO3)2
(e) CO2 + H2O
Discuss the factors that affect a chemical change.
What do you observe in the following cases?
(a) Lead nitrate is heated.
(b) Silver chloride is exposed to sunlight.
(c) Hydrogen peroxide is exposed to sunlight
(d) H2S gas is passed through copper sulphate solution
(e) Barium chloride is added to sodium sulphate solution.
(f) Water is added to quick lime
(g) Sodium chloride solution is added to silver nitrate solution.
State the effects of endothermic and exothermic reactions on the surroundings with examples.