Lesson Starter Draw a picture and write a description of the particles in: a) A solid b) A liquid c) A gas Write down two examples (not involving water) of when solids change to a liquid What is the name for when solids change to liquids? What is the name for when liquids change to solids?

What’s the matter? Lesson 6

Investigating change of state- practical Lesson 6 Investigating change of state- practical

Liquids turn into solids- FREEZING What we know so far.. Solids turn into liquids- MELTING Liquids turn into solids- FREEZING

Apparatus Goggles Bunsen Burner Tripod Beaker Test tube Dropper Cotton wool Nail varnish remover Beaker of crushed ice

Method Light your Bunsen burner and leave it on the safety flame Measure 150 mls of water into your beaker Place beaker on tripod stand and heat using the flame from the Bunsen until it almost boils then TURN THE BUNSEN OFF Put 5 drops of nail varnish remover into the test tube Bung the top of the test tube loosely Sit the test tube in the warm water and watch what happens- describe what you see in your booklet Take the test tube out of the water and place in the beaker of crushed ice- watch what happens and describe what you see

What did you see? What did you see when you heated the nail varnish remover? What does this tell you about heating a liquid? What did you see when you cooled the test tube? What does this tell you about cooling a gas?

Boiling When we heated the nail varnish remover- we gave it more energy The particles spread out The state changed from liquid to gas This is called BOILING or EVAPORATION

Condensation When we cooled the nail varnish remover the particles had less energy Particles couldn’t move around as much or as freely The state changed from a gas to a liquid This is called CONDENSATION

Questions Answer the questions on page 13 of your “What’s the matter?” booklet

Homework Due in Monday 2nd November: exercise on page 9 of What’s the matter booklet