This type of reaction is a single replacement reaction. We know this because replacement reactions occur when a metal from the electrochemical series is mixed with the ions of a metal lower down in the series. In this reaction, Zinc is the higher series and copper is lower. The atoms of the more reactive metal push their electrons on to the ions of the less reactive metal.
This reaction is an exothermic reaction. This is because copper is being formed during the reaction, meaning that new bonds are being formed. The definition of exothermic is a chemical reaction that releases energy and creates new bonds.
This reaction is an acid. We know this because when we tested our mixture with the blue litmus paper, it turned