Chemical Reactions and Equations

Answer

Balanced equation: 2Mg(s) + O₂(g) → 2MgO(s) This is a combination reaction because two reactants (Mg and O₂) combine to form a single product (MgO). It's also exothermic as heat and light are released…

Answer

Iron is more reactive than copper, so it displaces copper from copper sulphate solution. Reaction: Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s). The brownish coating is copper metal deposited on iron. Blue c…

Answer

Green ferrous sulphate crystals turn reddish-brown and emit SO₂ gas with a burning sulfur smell. Equation: 2FeSO₄(s) → Fe₂O₃(s) + SO₂(g) + SO₃(g) This is a thermal decomposition reaction where one rea…

Answer

Step-by-step balancing: 1. Count atoms: Fe(1→3), H(2→2), O(1→4) 2. Balance Fe: 3Fe + H₂O → Fe₃O₄ + H₂ 3. Balance O: 3Fe + 4H₂O → Fe₃O₄ + H₂ 4. Balance H: 3Fe + 4H₂O → Fe₃O₄ + 4H₂ Final: 3Fe(s) + 4H₂O(…

Answer

Respiration releases energy (heat) when glucose combines with oxygen in our cells. This energy is essential for life processes. Equation: C₆H₁₂O₆(aq) + 6O₂(aq) → 6CO₂(aq) + 6H₂O(l) + energy It's exoth…

Answer

Electrolysis of water produces hydrogen and oxygen gases. Equation: 2H₂O(l) → 2H₂(g) + O₂(g) Hydrogen gas (double volume) is collected at cathode, oxygen gas (single volume) at anode. The 2:1 ratio ma…

Answer

Oxidation: Gain of oxygen or loss of hydrogen Reduction: Loss of oxygen or gain of hydrogen In CuO + H₂ → Cu + H₂O: - H₂ is oxidized (gains oxygen to form H₂O) - CuO is reduced (loses oxygen to form C…

Answer

Equation: Na₂SO₄(aq) + BaCl₂(aq) → BaSO₄(s) + 2NaCl(aq) White precipitate is BaSO₄ (barium sulphate) This is a double displacement reaction where ions exchange between reactants. It's also a precipita…