Students heat calcium carbonate in a crucible causing it to decompose into calcium oxide and carbon dioxide. CaCO3 Cao + 1020 (5) The stoichiometry predicts that 10.0 grams of Caco, will turn into 5.6 grams of Cao. The actual experiment, however, resulted in 5.0 grams of compound in the crucible after the heating. Suggest a source of error in the actual experiment and explain how that error would have made the mass of CaO appear to be too low. (10 pts)​

Two changes are described below. a green banana turns yellow and ripens. a layer of rust forms on an iron nail. which statement is true about the two changes? a) both are chemical changes because new substances are formed. b) both are physical changes because only the physical state of the substances change. c) a is a physical change due to a change of state, but b is a chemical change because new molecules are formed. d) a is a chemical change due to a change of state, but b is a physical change because new molecules are formed.