2.2 Water

2.2 Water.

Lesson One – the properties of water

Water is not an organic molecule. It is arguably the most important compound for life on Earth. We are going to look at why water is so useful: as a component of cells and body systems, and as an abiotic component of a habitat.

Key vocabulary:

Polarity: having a negative or / and a positive charge.

Adhesion: Forces which allow water to ‘stick’ to surfaces

Cohesion: Forces which allow water to ‘stick’ to each other

Latent heat of vaporisation of water: the energy required to make water evaporate

Specific heat capacity of water: the energy required to make water increase in temperature

Solvent: a substance which allows solutes to dissolve in it (solutes eg. sugar, dissolve in solvents)

The slides in the powerpoint below will be used in the lesson

Task: Download and fill in the table on water properties (click)

Task one- The Properties of water


Lesson two: Water lab

Objectives: practice paper three style questions. Learn how to estimate osmolarity (and therefore osmotic potential). Interpret a graph of osmolarity.

Instructions (click below)

Potato Osmolarity Lab


Lesson three: Food analysis lab (McDonald’s experiment)


In order to prepare for this lab it is recommended you watch this video, showing the lab standard food tests.




Hand-out for lab Paper 3 Practice McDonalds lab

Paper 3 practice McDonalds lab



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