which substance is an element?

Question

CH4 .
N2.
NO2.
NaCl .

Answer 1

n2

Answer 2

its N2............bc its the only single one and an element is a single substance.
In other cases as in Methane CH4 its the combination of two elemnts; Hidrogen and carbon.
In NO2: there are Nitrogen and Oxygen.
In NaCl; Its Sodium and Chlorine.
I think its enough to explain.

Answer 3

An element is a pure substance, whereas a molecule is a linked unit of two or more elements.

N2 is the only think on your list that contains nothing else. NO2 contins Nitrogen and Oxygen.

Get it?

Answer 4

N2 is Nitrogen, it is an element. All the others are compound.

You will know if it is an element,simply check with the "Periodic Table of Elements". You will find this easy, chemistry is fun!!!

Answer 5

N2 is the only element here. it does not matter even if it exists in a molecular state.
rest others are compounds since they have more than 2 elements.

Answer 6

N2 is the only element here. It may look like like a compound, but really nitrogen is diatomic, hence the 2.

Answer 7

Tychabrah is correct NO2 is Nitrous Oxide
NaCl is Sodium Chloride or table salt
N2 is nitrogen
and I don't know what CH4 is but I can tell you it has chemical composition of more than one substance.
Elements are naturally occuring pure substances

Check out the link below

Answer 8

N2

Answer 9

N2

Answer 10

N2. The rest are compounds, i.e. they are made up of more than one element.

This should be easily found in a 6th grade chemistry book. Get your hands on one sometime.