Chemical Reactions and Equations — Flashcards
Karnataka Board · Class 10 · Science
20 flashcards for Chemical Reactions and Equations (Karnataka Board Class 10 Science) to test yourself on key terms and facts.
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A student heats 2g of magnesium ribbon in air. It burns with a dazzling white flame and forms 3.33g of white powder. Write the balanced chemical equation and explain what type of reaction this is.
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…
Why does iron nail turn brownish when dipped in blue copper sulphate solution, and why does the blue color fade?
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…
What happens when ferrous sulphate crystals (green) are heated strongly? Write the equation and identify the type of reaction.
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…
How do you balance the chemical equation: Fe + H₂O → Fe₃O₄ + H₂?
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(…
Why is respiration considered an exothermic reaction? Write the equation.
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…
What is observed when electric current is passed through water? Write the equation and explain the gas collection.
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…
Define oxidation and reduction with an example from the reaction: CuO + H₂ → Cu + H₂O
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…
A student mixes sodium sulphate and barium chloride solutions. A white precipitate forms. Write the equation and identify the reaction type.
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…
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
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