Which of the following statements is true about gasses?

1)density cannot be determined for a gas.
2)the volume of a gas is always equal to the volume of the enclosing container.
3)the density of a gas equals volume per unit mass.
4)a balloon containing a gas with greater density than air will rise.

i think it is 2 but i'm not sure

2)The volume of a gas is always equal to the volume of the enclosing container.

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

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.