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Learning objective

Identify that bases are the oxides or hydroxides of metals, and that alkalis are bases that dissolve in water.

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Cambridge IGCSE Combined ScienceAcids, bases and saltsCore content

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Quick explanation

Identify that bases are the oxides or hydroxides of metals, and that alkalis are bases that dissolve in water

  • This point belongs to The characteristic properties of acids and bases, especially The characteristic properties of acids and bases outcomes.
  • You need to be able to identify that bases are the oxides or hydroxides of metals, and that alkalis are bases that dissolve in water.
  • The key ideas to know are State and Identify.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

StateIdentify

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Paper 3 structured question: The characteristic properties of acids and bases

Paper 3Theory (Core)1 marks

Description

Properties of Bases and Alkalis

Bases are substances that can neutralize acids. Alkalis are bases that dissolve in water, producing hydroxide ions. Examples include sodium hydroxide and potassium hydroxide.

  1. a

    Define the term 'alkali'.

    Aim for approximately 1 distinct marking point.

    [1]
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