Astudent made a homogeneous mixture of water and salt. which of the fallowing statements applies to this homogeneous mixture?
a- this mixture is a solution
b-this mixture is a pure substance
c-the salt is not evenly distributed throughout this mixture
d-the salt chemically combines with the water in this mixture

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.