Metal & Acid Reactions as Redox Reactions (AQA GCSE Chemistry: Combined Science)

Revision Note

Test yourself
Stewart

Author

Stewart

Last updated

Metals & acid reactions as redox reactions

Higher tier only

  • Metal-acid reactions are redox reactions
  • Redox means reduction and oxidation at the same time
  • If we analyse the ionic equation for the reaction between zinc and hydrochloric acid:

Zn + 2HCl ZnCl2 + H2

  • The ionic equation is:

Zn + 2H+ Zn2+ + H2

  • This equation can be further split into two half equations illustrating oxidation and reduction individually:

Zn → Zn2+ + 2e

2H+ + 2e→ H2

  • The zinc atoms are thus oxidised as they lose electrons.
  • The hydrogen ions are thus reduced as they gain electrons.
  • Both reactions are occurring at the same time and in the same reaction chamber hence it is a redox reaction

Examiner Tip

Remember metal atoms tend to lose electrons and in these reactions are usually the species that undergoes oxidation.

You've read 0 of your 10 free revision notes

Unlock more, it's free!

Join the 100,000+ Students that ❤️ Save My Exams

the (exam) results speak for themselves:

Did this page help you?

Stewart

Author: Stewart

Expertise: Chemistry Lead

Stewart has been an enthusiastic GCSE, IGCSE, A Level and IB teacher for more than 30 years in the UK as well as overseas, and has also been an examiner for IB and A Level. As a long-standing Head of Science, Stewart brings a wealth of experience to creating Exam Questions and revision materials for Save My Exams. Stewart specialises in Chemistry, but has also taught Physics and Environmental Systems and Societies.