Questions on Metals and Reactions
i. Name the substances X and Y.
ii. Name the chemical processes occurring during both changes.
iii. Write the chemical equations of the reactions.
(i) X : Copper (Cu)
Y : Copper Oxide (CuO)
(ii) Oxidation of X and Reduction of Y
(iii) 2Cu + O2 → 2CuO
CuO + H2 → Cu + H2O
Q2. Write the commercial name and chemical formula of
a) Sodium Hydroxide
Commercial Name: caustic soda
Chemical Name: NaOH
b) Potassium Hydroxide
Commercial Name: caustic potash
Chemical Name: KOH
Q3) Give one example each of:
a) thermal decomposition reaction
CaCO3 → CaO + CO2
When heated Calcium Carbonate, decomposes into Calcium Oxide and Carbon Dioxide.
b) Electrolytic decomposition reaction
2H2O→ 2H2 + O2
Dissociation of water
c) Photo decomposition reaction
Decomposition of silver chloride into silver and chloride by light.