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3.3 Types of chemical reactions

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Question 7

Two soil-water extracts, P and Q, are tested. One measurement shows that the concentration of H+\mathrm{H^{+}}H+ ions in extract P is 100 times greater than in extract Q.

How does the pH of extract P compare with the pH of extract Q?

[1]
A

two pH units lower

B

two pH units higher

C

one pH unit higher

D

one pH unit lower

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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