SME
Grade 10 Science · Problem type
Predicting a single replacement
Use this for “Does zinc react with copper(II) sulfate, and what does it make?”
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Does the reaction happen?
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Assumptions
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A metal replaces another in a compound only when it is higher on the activity series: Mg, Al, Zn, Fe, Ni, Pb, H, Cu, Ag.
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When it does, the metals trade places: Zn + CuSO₄ → ZnSO₄ + Cu.
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A metal above hydrogen replaces it from an acid, giving H₂ gas.
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Related lessons
Chemical equations: balancing, types of reactions and predicting products
Main lesson
Balancing the combustion of an alkane
Use this to balance any alkane burning, such as “C₃H₈ + O₂ → CO₂ + H₂O”: carbon first, hydrogen next, oxygen last.
Balancing the combustion of an alkene
Use this to balance an alkene burning, such as “C₅H₁₀ + O₂ → CO₂ + H₂O”: with an odd number of carbons the fuel’s coefficient is 2.
Balancing a synthesis: aluminum oxide
Use this for “Balance Al + O₂ → Al₂O₃.”
Balancing a single replacement: zinc in acid
Use this for “Balance Zn + HCl → ZnCl₂ + H₂.”