which of these substances dissolve in water? and are they elements or compounds?

copper nitrate
sodium hydroxide
copper hydroxide
copper oxide
hydrochloric acid
aluminum
copper chloride
hydrochloric acid

1 answer

Al is an element. The others are compounds. Consult this site for solubility.
http://www.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html