What is empirical formula of N306?

Explanation: The empirical formula of a compound is the simplest whole number ratio of atoms in the compound. In , the ratio of N atoms to O atoms is 3:6, which can be reduced to 1:2. Using the reduced ratio, put new subscripts on the compound: . Since subscript of 1 on the N is implied, no subscript needs to be written on the N, and the empirical formula is simply .

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

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)