You must complete an appropriate risk assessment before undertaking any investigation. This means that you must think about all of the possible risks involved, for example; are the chemicals harmful, are hot materials involved, is a naked flame needed? When you have considered the possible dangers you have to decide how you will proceed without harming yourself or others. For example “My experiment involves using hydrochloric acid, this is corrosive, the main danger is the damage it could do to my eyes. So I will wear safety specatacles”
In a hypothesis you try to explain an observation or prediction using what you know about science. An example of a hypothesis is; “The more concentrated an acid is, the quicker it will react with magnesium. This is because there are more acid particles to react with the metal if the acid is concentrated” You can carry out an experiment to test your hypothesis.
When you plan an experiment there are 3 different types of variables to consider. The independent variable is the thing which you change. The dependent variable is the variable you measure to produce your results. To ensure that your test is fair everything else must stay constant these are your control variables.
This is simply a list of all the apparatus you will need in your investigation.
This is the procedure you follow to carry out your experiment.
These should be in a table, the column headings must have the names of the independent and dependent variables and the units they are measured in. You will also need to produce a graph of your data.
Does your data support your hypothesis?
Is there any other data which agrees with yours?