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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 :

  1. Evolution of gas
    Zn(NO3)2 Δ\xrightarrow{\Delta} 4NO2 + 2ZnO + O2

  2. Change of colour
    Fe iron+CuSO4 blue sol. (aq.)FeSO4 green sol.+Cu copper-brown red deposit\underset{\text{ iron}}{\text{Fe}} + \underset{\text{ blue sol.}}{\text{CuSO}4} \text{ (aq.)} \longrightarrow \underset{\text{ green sol.}}{\text{FeSO}4} + \underset{\text{ copper-brown red deposit}}{\text{Cu}}

  3. Change of state
    2H2O (l) currentelectric\xrightarrow[\text{current}]{\text{electric}} 2H2 (g) + O2 (g)

  4. Formation of precipitate
    NaCl (aq.) + AgNO3 (aq.) ⟶ AgCl (white ppt.) ↓ + NaNO3 (aq.)

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