1. If there is a correct value for a measurement, then we should be able to obtain that correct value when measuring. Explain the reason that the values obtained through measurements are not the same, and that we tend to rely on an average value to be representative of the correct value.

2. There are two types of errors: absolute and relative. Two measurements are made using an electronic balance that reads +/-0.005 grams. The values obtained are 2.35 and 8.96 grams. Define absolute error and identify the absolute error in these two measurements. Then, define the relative error, and identify the relative error in these two measurements. What does this suggest about making measurements in the lab?

3. An experimental procedure requires us to digest a soil sample in acid for 24 hours. The digestion is tested at a later time to determine its effectiveness. It is found that allowing a further 24 hours of digestion time increases the amount of analyte in the acidic solution. Explain the impact of this discovery on how well the method works, the type of error (if any) and the impact it has on the past and future use of this method.