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HKDSE Form 4
End Practice
Page 1/3: Select Reactions
Metals + O
2
Metals + Cold H
2
O
Metals + Steam
Metals + Dil. HCl
Metals + Dil. H
2
SO
4
Metal Extraction
Metal Displacement
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🔥 Advanced Exam (15 Qs, Timer)
Page 2/3: Select Calculation Types
Simple Mole Ratio
Limiting / Excess Reagent
Percentage Yield
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Page 3/3: Number of Questions
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General Equations
Oxygen:
Metal + Oxygen → Metal Oxide
Cold Water:
Metal + Cold Water → Metal Hydroxide + Hydrogen
Steam:
Metal + Steam → Metal Oxide + Hydrogen
Dilute Acid:
Metal + Dilute Acid → Salt + Hydrogen
Displacement:
More reactive metal + Less reactive metal salt → More reactive metal salt + Less reactive metal
Extraction (C):
Metal Oxide + Carbon → Metal + Carbon Dioxide
Extraction (CO):
Metal Oxide + Carbon Monoxide → Metal + Carbon Dioxide
Moles (mol)
= Mass (g) ÷ Molar Mass (g mol
-1
)
% Yield
= (Actual Yield ÷ Theoretical Yield) × 100%
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