| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
|
In chemistry, a pure substance is a single element or compound, not mixed with any other substance. |
|
What is a pure substance? Design a flow chart assigning elements/compounds/mixtures as pure or impure.
Why is 'pure' orange juice not pure? |
|
|
|
A formulation is a mixture that has been designed as a useful product. |
|
What is a formulation? Case study: How tablets are made to ensure that the taker receives the correct dose of medication. |
|
|
|
Pure elements and compounds melt and boil at specific temperatures. Melting point and boiling point data can be used to distinguish pure substances from mixtures. |
|
What can be used to distinguish between pure substances and mixtures? Study a range of melting points of pure and impure substances. Students draw conclusions from this. |
|
|
|
Formulations include fuels, cleaning agents, paints, medicines, alloys, fertilisers and foods. |
|
What are examples of formulations? Study a recipe and discuss how changing the recipe may affect the food product made. Link to formulations and why we use formulations |
|
|
|
In everyday language, a pure substance can mean a substance that has had nothing added to it, so it is unadulterated and in its natural state, eg pure milk. |
|
What is a pure substance in everyday language? |
|
|
|
Formulations are made by mixing the components in carefully measured quantities to ensure that the product has the required properties. |
|
How are formulations made? Suggested practical:
Making mayonnaise |
|
|
|
Students should be able to use melting point and boiling point data to distinguish pure from impure substances. |
|
Analyse information on the melting points of pure gold against counterfeits as a method for determining purity |
|
|
|
Students should be able to identify formulations given appropriate information. |
|
|
|
|