During the chemistry unit, I learned lots of things such as the difference between physical and chemistry property/change, separation techniques, mixtures, compounds, elements, pure substances, and etc. Additionally, the experiments about the chemistry and physical change and the instruments for separating were very interesting. Now, I know that the scientists use separation techniques with using the physical property of the substance. For example, to separate the salt from the water, you boil the water which has the boiling point of 100 degrees Celsius. Therefore, the water will evaporate and the salt which has much higher boiling point won’t evaporate.