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Calcium oxide, CaO\text{CaO}CaO, is a white ionic solid.

a.

Describe the ions present in calcium 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.

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

[2]
c.

Which ion is responsible for the alkaline properties of solutions of alkalis?

[1]
d.

A salt is made when calcium hydroxide neutralises hydrochloric acid. Name this salt.

[1]
e.

A sample of hydrochloric acid has a pH of 1.651.651.65.

A student adds water to the hydrochloric acid until the pH is 5.655.655.65.

The concentration of hydrogen ions decreases.

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

[2]

Types of chemical reactions Questions

Practise OCR GCSE Chemistry Types of chemical reactions with exam-style questions for Foundation and Higher tier. 58 questions, matched to the OCR GCSE Chemistry (J248) specification and written in Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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Types of chemical reactions Questions

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