1. What is the difference between accuracy and reliability? What is precision?

3. Objectives Know how to and effectively use a colourimeter. Outcomes 3: Carry out the practical and record results in a suitable table. 5: Carry out the experiment safely at all times with repeats and calculate a mean. 7: Take steps to control accuracy and reliability in carrying out the investigation. Key terms: accuracy, reliability, uncertainty, colourimeter

4. Carry out the practical looking at the break down of starch by amylase. Key points: Readings every 2 minutes up to 14 minutes. Repeats Outcomes 3: Carry out the practical and record results in a suitable table. 5: Carry out the experiment safely at all times with repeats and calculate a mean. 7: Take steps to control accuracy and reliability in carrying out the investigation. Key terms: accuracy, reliability, uncertainty, colourimeter