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Physical and Chemical Change: Concept Map

≈ 25 min
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Concept Map

Organise the vocabulary, quantities and relationships into a connected model.

This extension applies that lens specifically to Physical and Chemical Change.

  • A physical change changes only the appearance or state — no new substance forms and it is usually reversible. Melting ice, dissolving sugar, tearing paper, boiling water.
  • A chemical change (a reaction) forms one or more new substances and is usually hard to reverse. Signs: a colour change, a gas produced, a precipitate, heat/light given off. Burning wood, rusting iron, baking bread.

A precipitation reaction happens when two solutions mix and an insoluble solid (a precipitate) forms. Example (reactions in aqueous solution):

AgNO3(aq)+NaCl(aq)→AgCl(s)+NaNO3(aq)\text{AgNO}_3(aq) + \text{NaCl}(aq) \rightarrow \text{AgCl}(s) + \text{NaNO}_3(aq)

The white AgCl\text{AgCl} solid is the new substance — proof of a chemical change.

Chemistry — Grade 10 — Concept Map: Which of these is a chemical change?

Chemistry — Grade 10 — Concept Map: When AgNO3(aq)\text{AgNO}_3(aq) is added to NaCl(aq)\text{NaCl}(aq), a white solid appears. This white solid is called a…

Chemistry — Grade 10 — Concept Map: Boiling water to make steam — is this a physical or a chemical change? (one word)

Name the original topic being extended by this concept map lesson.

Which statement is the best evidence-led starting point for Physical and Chemical Change: Concept Map?