PS.6.1.2: Use models to explain the relationship between changes in thermal…

Solids, Liquids and Gases Grade 5 · partly supports this outcome

Where does a puddle go? Why does ice float? A first look at the tiny particles that explain the stuff around us.

• Where does a puddle go? 50–60 min

  Teams race wet paper towels in still air, in wind, in a warm spot and under a cup to find out what makes water disappear faster. They catch the 'missing' water on the inside of the cup and explain evaporation with particles.

• Why does ice float? 50–60 min

  Students compare water before and after freezing: same weight, but more space. They float a block of ice, measure how much sticks out, and use particles to explain why lakes freeze from the top down and fish survive the winter.

Hot and Cold: Particles on the Move Grade 6 · partly supports this outcome

Why tires go soft in winter, why sidewalks have gaps, and how a thermometer knows. Five lessons on what heating and cooling do to the particles in everything around us.

• Why do bike tires go soft in winter? 45–60 min

  Students stretch a balloon over a bottle, move it between warm and ice water, and find out what happens to air particles when they cool down. Then they explain a cyclist's 'flat' tire on the first cold morning.

• Why does food colouring spread faster in hot water? 45–60 min

  Two cups, two drops, one race. Students drop food colouring into warm and ice-cold water at the same moment, then explain what the moving colour tells us about particles they can't see.

• How does a thermometer know? 50–60 min

  Teams build a working thermometer from a bottle of coloured water and a clear straw, then calibrate it against a real thermometer. At the end, they explain how any liquid thermometer 'knows' the temperature.

Printable practice for PS.6.1.2

These pages practise a closely related idea; the match to PS.6.1.2 is partial.

• Hot and Cold: Particles on the Move workbook included with the unit

  4 readings, 3 English-support pages, 3 practice pages, 1 word wall, 1 unit review, 1 unit test, with answer keys.

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