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.
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)
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)
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