Lab 5B

Lab 5B is the first lab we did which dealing with reaction this term. There are totally seven reactions including Sythesis, Single Replacement, Decomposition and Double Replacement. The objective of this lab is to observe a varity of chemical reactions and to classify each reaction as one of the four main types.
(Several chemical reagents have been used in this lab, so wearing a safety goggle and lab apron is necessary. )
Reaction 1 (2 Cu + O2 = 2 CuO)is a sythesis reaction, though it need high temperature to achieve the reaction. In that case, you will find red copper wire become dark black at last.
Reaction 2 (2 Fe +3 CuSO4 = Fe2(SO4)3 + 3Cu) is a Single Replacement, which using Fe to replace Cu. We put a iron nail into blue solution which is CuSO4. Several seconds later, some rust appears and the shiny iron nail becomes black.
Reaction 7 (2 H2O2 + (MnO2) = 2 H2O + O2). This one is quite different from before, in that case, MnO2 is a kind of catalyzer which will not avolved in the reaction. So as you see in right hand side, the products, there is even no element Mn. However, this catalyzer is quite good, the reaction will be very fast with only a little MnO2.
This lab shows some basic reactions in daily chemistry. Some reactions are very familiar in our everyday life. For example, reaction 3(CuSO4*5H2O = CuSO4 + 5 H2O) is the most common way to make  pure CuSO4 in industry.