Describe what happens when a substances for liquid will not dissolve any more of Exploring: testing. Does it dissolve? a solid and use correctly the terms: Students test what happens when solubility, saturated solution. different substances are stirred into a Demonstrate State what happens to mass in a beaker of tap water. Provide a range of the change of physical change. soluble and insoluble substances for solubility with Securing testing. temperature Describe how factors affect how lead iodide. much of a substance dissolves. Explaining: Snowstorm in a test tube Ask students to Describe how we know that Demonstrate the change of solubility explain what different solutes have different with temperature using lead iodide. Ask they see and solubilities. students to explain what they see and why it happens. Exceeding why it happens. Plan a fair test to discover how different factors affect the solubility Plenary: Thinking skills of a substance. Plus, Interesting: Teabags should be made bigger, and have bigger holes. (Possible answers: Plus more water – would get into the bag so the soluble substances in the tea would dissolve out faster; Minus the pieces of tea would – need to be bigger so they stay in the bag; Interesting Would this change the – flavour of the tea? In May 2013 a food company in Australia unveiled a teabag with a mass of 151 kg enough for 100 – 000 cups of tea. Lesson 7Ec: Evaporation Learning objectives Exemplar teaching activities Differentiation Resources skills Practical skills Developing Starter: Recovering solids from Exploring: Resources n/a Students obtain Describe what happens during solution Making salt from from 7Ec samples of pure evaporating. Stir a spoonful of a soluble salt rock salt Exploring salt from rock State what happens at a material's into a small beaker of water until the Give this practical Science. salt, using the boiling point. solid has fully dissolved. Then ask: context by techniques of Securing How could we get the solid back out providing
Describe what happens when a liquid will not dissolve any more of a solid and use correctly the terms: solubility, saturated solution. State what happens to mass in a physical change. Securing Describe how factors affect how much of a substance dissolves. Describe how we know that different solutes have different solubilities. Exceeding Plan a fair test to discover how different factors affect the solubility of a substance. Exploring: Does it dissolve? Students test what happens when different substances are stirred into a beaker of tap water. Provide a range of soluble and insoluble substances for testing. Explaining: Snowstorm in a test tube Demonstrate the change of solubility with temperature using lead iodide. Ask students to explain what they see and why it happens. Plenary: Thinking skills Plus, Interesting: Teabags should be made bigger, and have bigger holes. (Possible answers: Plus – more water would get into the bag so the soluble substances in the tea would dissolve out faster; Minus – the pieces of tea would need to be bigger so they stay in the bag; Interesting – Would this change the flavour of the tea? In May 2013 a food company in Australia unveiled a teabag with a mass of 151 kg – enough for 100 000 cups of tea. substances for testing. Demonstrate the change of solubility with temperature lead iodide. Ask students to explain what they see and why it happens. Lesson 7Ec: Evaporation Learning objectives Exemplar teaching activities Differentiation Resources skills Practical skills Developing Describe what happens during evaporating. State what happens at a material's boiling point. Securing Starter: Recovering solids from solution Stir a spoonful of a soluble salt into a small beaker of water until the solid has fully dissolved. Then ask: How could we get the solid back out Exploring: Making salt from rock salt Give this practical context by providing Resources from 7Ec Exploring Science. n/a Students obtain samples of pure salt from rock salt, using the techniques of
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