Chemical Reaction and Equations
Himachal Pradesh Board · Class 10 · Science
Flashcards for Chemical Reaction and Equations — Himachal Pradesh Board Class 10 Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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See them allWhat happens when magnesium ribbon is burnt in air? Write the balanced equation and identify the type of reaction.
Answer
When magnesium ribbon burns in air, it forms magnesium oxide with a dazzling white flame. Balanced equation: 2Mg(s) + O₂(g) → 2MgO(s). This is a combination reaction because two reactants combine to f…
Why does an iron nail turn brownish when dipped in copper sulphate solution? What type of reaction is this?
Answer
Iron is more reactive than copper, so it displaces copper from copper sulphate solution. The iron nail gets coated with reddish-brown copper metal. Equation: Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s). Thi…
What is observed when lead nitrate is heated? Write the balanced equation and identify the reaction type.
Answer
When lead nitrate is heated, brown fumes of nitrogen dioxide are released. Balanced equation: 2Pb(NO₃)₂(s) → 2PbO(s) + 4NO₂(g) + O₂(g). This is a thermal decomposition reaction where a single compound…
How do you balance the chemical equation: Fe + H₂O → Fe₃O₄ + H₂?
Answer
Step-by-step balancing: 1) Start with the most complex compound (Fe₃O₄). 2) Balance oxygen: 4H₂O on left side. 3) Balance hydrogen: 4H₂ on right side. 4) Balance iron: 3Fe on left side. Final balanced…
What is the difference between exothermic and endothermic reactions? Give one example of each.
Answer
Exothermic reactions release heat and energy (temperature increases). Example: Burning of methane - CH₄ + 2O₂ → CO₂ + 2H₂O + Heat. Endothermic reactions absorb heat and energy (temperature decreases).
Why is respiration considered an exothermic process? Write the equation for respiration.
Answer
Respiration is exothermic because it releases energy that our body uses for various life processes. Glucose combines with oxygen to produce energy. Equation: C₆H₁₂O₆(aq) + 6O₂(aq) → 6CO₂(aq) + 6H₂O(l)…
What happens when calcium oxide is mixed with water? Is this reaction exothermic or endothermic?
Answer
Calcium oxide (quick lime) reacts vigorously with water to form calcium hydroxide (slaked lime) and releases a large amount of heat. Equation: CaO(s) + H₂O(l) → Ca(OH)₂(aq) + Heat. This is a combinati…
What is electrolysis of water? What gases are produced and in what ratio?
Answer
Electrolysis of water is the decomposition of water into hydrogen and oxygen using electricity. Equation: 2H₂O(l) → 2H₂(g) + O₂(g). Hydrogen is produced at the cathode and oxygen at the anode in a 2:1…
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