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Types of chemical reactions

Types of chemical reactions

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Question 3

Potassium oxide, K2O\text{K}_2\text{O}K2​O, is a white ionic solid.

a.

Describe the ions present in potassium oxide by stating:

  • The symbols and charges of the two types of ions present.
  • The number of electrons in the outer shell of each ion.
[2]
b.

Potassium oxide reacts with water to form an aqueous solution of potassium hydroxide. Write the balanced symbol equation for this reaction, including state symbols.

[2]
c.

Which ion is responsible for the acidic properties of solutions of acids?

[1]
d.

A salt is made when potassium hydroxide neutralises nitric acid. Name this salt.

[1]
e.

A sample of nitric acid has a pH of 2.15.

A student adds water to the nitric acid until the pH is 5.15.

The concentration of hydrogen ions decreases.

Calculate the factor by which the hydrogen ion concentration has decreased.

[2]
Markscheme

Types of chemical reactions Questions

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

55 exam-style questions on OCR GCSE Chemistry Types of chemical reactions. Each one has a worked solution and a mark scheme showing where the marks go.

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