What is a substance? * A. Water
b. Anything that is unique in it's properties
c. The things that make up all living and non-living things
d. Iron
e. All of the above
f. None of the above

anything that has a definite chemical composition or has mass and takes up space

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

b) mutualism

hope this : )