Basically "hypothesis" is what you think will happen. It is your prediction of the outcome before you do the experiment. Usually hypothesis statement includes "if".................."then"........not always and It doesn't really have to. Usually it is 1-2 sentences.
Examples of hypothesis:
If the temperature is higher then the rate of reaction
Unsaturated hydrocarbons will burn with soty flames
Energy density of a compound is dependent on the number of carbon atoms that the combound has.
Your hypothesises can be right or wrong, that does not matter. If you have to write a report you can talk about whether your hypothesis was supported or not by the result you got and why.