1. An aqueous solution is prepared by adding 110 mg of calcium chloride (CaCl2) and 50 mg of calcium sulfate (CaSO4) to 500 mL of water. The solution pH is 8.0 ([H+] = 10−8 M; [OH− ] = 10−6 M). (a) Assuming that the salts dissociate completely, express the concentration of each of the dissociation products (Ca2+, Cl− , and SO4 2− ) in mg/L, millimolar, and normal (N) units. (b) If the total molar concentration of all species in the solution is the same as in pure water, what are the mole fractions of H+ , OH− , Ca2+, Cl− , and SO4 2− , and H2O?

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance