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3.3 Types of chemical reactions

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Question 3

Zinc reacts with hydrogen ions in an acid.

Zn+2H+→Zn2++H2 \mathrm{Zn + 2H^+ \rightarrow Zn^{2+} + H_2} Zn+2H+→Zn2++H2​

A student writes these electron equations.

Zn→Zn2++e− \mathrm{Zn \rightarrow Zn^{2+} + e^-} Zn→Zn2++e− 2H++2e−→H2 \mathrm{2H^+ + 2e^- \rightarrow H_2} 2H++2e−→H2​

The student concludes, “Zinc is oxidised and my equations show that electrons are conserved.”

Evaluate the student's conclusion.

[4]
Markscheme

3.3 Types of chemical reactions Questions

  1. GCSE
  2. /Chemistry
  3. /3.3 Types of chemical reactions

112 exam-style questions on OCR GCSE Chemistry 3.3 Types of chemical reactions, covering 3.3.1 Oxidation and reduction in terms of oxygen, 3.3.2 Acids, alkalis and neutralisation, 3.3.3 The pH scale and measuring pH, 3.3.4 Oxidation and reduction in terms of electrons, 3.3.5 Dilute and concentrated, weak and strong acids, and 3.3.6 Hydrogen ion concentration and pH. Each one has a worked solution and a mark scheme showing where the marks go.

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