Calculate the molarity of a solution made by adding 35.0 ml of concentrated perchloric acid (70.5 % by mass, density 1.67 g/ml) to some water in a volumetric flask, then adding water to the mark to make exactly 2000 ml of solution. (it is important to add concentrated acid or base to water, rather than the other way, to minimize splashing and maximize safety.)

yes yes yes yes yes yes yes yes yes yes yes yes yes yes yes

explanation:

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