An engaging lesson presentation (39 slides) with associated differentiated worksheets that looks at they key differences between pure and impure substances and briefly explores how a mixture like an alloy can still be very useful.
The lesson begins by challenging the students to recognise 4 diagrams of pure substances from a selection of 5. This will lead students to the definition of pure (in Science) which is likely to be different to what they have encountered in everyday language. The next task gets the students to draw a graph showing the melting and boiling points of pure water. This will enable them to compare the melting point against that of an impure substance and therefore recognise that this difference can be used as point to decide on purity. An example of gritting is used to explain how this change in melting point can be utilised and then the students are challenged to apply this new-found knowledge to the situation of adding salt to boiling water when making pasta. The remainder of the lesson focuses on some famous mixtures. Beginning with air, students will be able to visualise how this mixture is made of a number of gases, each with different boiling points which allows them to be separated by fractional distillation. Alloys are briefly explored so that students know why these mixtures are used for certain functions over pure metals and the summary passage for this task has been differentiated two ways so that all can access the work. Progress checks have been written into the lesson at regular intervals so that students can check their understanding and a range of quick quiz competitions are used to maintain engagement whilst introducing new terms in a fun manner.
If you want to look into alloys in greater detail, then this lesson could be combined with the one named “alloys” which is also uploaded.
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