Is dissolving CuSo4 in H2O a chemical or physical reaction?

Technically, dissolution is quite different from dissociation. There is a difference in dissolution of sugar and dissociation of ionic compounds. The former is a physical change and the latter is not. Traditionally, chemical change can be associated to bond breaking and forming which results to new chemical species. read more

When CuSO4 (copper sulfate) dissolves in H20 (water) you still have copper sulfate and water, so there is no chemical reaction. It is a physical change. You will have copper and sulfate ions, but if you boil the solution and catch the steam, you will end up with copper sulfate and water. read more

For example, the freezing of water would be a physical change because it can be reversed, whereas the burning of wood is a chemical change - you can't 'unburn' it 2. A physical change is a change in which no new substance is formed; a chemical change results in the formation of one or more new substances. read more

A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound, using a single line of chemical element symbols and numbers. PubChem uses the Hill system whereby the number of carbon atoms in a molecule is indicated first, the number of hydrogen atoms second, and then the number of all other chemical elements in alphabetical order. read more