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Chemical Reactions
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Energy Changes and Corrosion
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10 problems
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Conceptual
Numerical
1.
24 g of methane burns completely: CH₄ + 2O₂ → CO₂ + 2H₂O.
High School (9–10), General · Chemical Equations, Energy Changes and Corrosion
StemPy Lab
Hard
2.
8 g of hydrogen burns in oxygen: 2H₂ + O₂ → 2H₂O.
High School (9–10), General · Chemical Equations, Energy Changes and Corrosion
StemPy Lab
Medium
3.
Zinc reacts with sulphuric acid: Zn + H₂SO₄ → ZnSO₄ + H₂.
High School (9–10), General · Chemical Equations, Energy Changes and Corrosion
StemPy Lab
Medium
4.
200 g of calcium carbonate is heated until it has all broken up: CaCO₃ → CaO + CO₂.
High School (9–10), General · Chemical Equations, Energy Changes and Corrosion
StemPy Lab
Medium
5.
What is rancidity? Give three ways to prevent it.
High School (9–10), General · Energy Changes and Corrosion
StemPy Lab
Medium
6.
Iron pipes are galvanised: they are coated with zinc.
High School (9–10), General · Energy Changes and Corrosion
StemPy Lab
Medium
7.
Four iron nails are kept for a week. Nail 1 is in tap water open to the air, and nail 2 is in…
High School (9–10), General · Energy Changes and Corrosion
StemPy Lab
Easy
8.
Respiration in the cells is C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy.
High School (9–10), General · Energy Changes and Corrosion
StemPy Lab
Medium
9.
5.6 g of quicklime, CaO, reacts with 200 g of water.
High School (9–10), General · Energy Changes and Corrosion
StemPy Lab
Medium
10.
Say whether each change is exothermic or endothermic.
High School (9–10), General · Energy Changes and Corrosion
StemPy Lab
Easy
StemPy Lab