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Dissolving, separating and changes

Year 5 · Upper Key Stage 2 · S5-MAT — Properties of materials; dissolving; separating mixtures; reversible and irreversible changes

Draft — awaiting teacher review

Builds on: States of matter (Year 4)

I

Concept Anchor

A reversible change can be undone, like melting or dissolving. An irreversible change makes something new and cannot be undone, like burning. Filters catch solid bits. Evaporating leaves a dissolved solid behind.

Worked example

Get salt back from salty water.

  1. 1.The salt has dissolved, so a filter will not catch it.
  2. 2.Leave the water in a warm place.
  3. 3.The water evaporates and the salt is left.
II

Guided Check

Is melting chocolate a reversible or irreversible change?

    III

    Independent Diagnostic Practice

    Q1Year 5S5-MAT — Irreversible change·Fluency·●○○Draft — awaiting teacher review

    Which of these is an irreversible change?

    Q2Year 5S5-MAT — Filtering·Reasoning·●●○Draft — awaiting teacher review

    Sand and salt are stirred into water. How can you take out the sand?

    Q3Year 5S5-MAT — Evaporating·Problem Solving·●●●Draft — awaiting teacher review

    How can you get the salt back from salty water?