3 At room temperature and pressure (rtp), which of the substances listed below is:
a a solid element?
b a liquid element?
ca gaseous mixture!
d a solid mixture?
e a liquid compound?
f a solid compound?
Bromine, carbon dioxide, helium, steel, air, oil,
marble, copper, water, sand, tin, bronze, mercury,
salt.

C

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