Density is a physical property of a sample.

All molecules are compounds.

Heterogeneous mixture is a type of mixture where particles are distributed uniformly

Compounds can be broken into its component elements by physical means

Atoms of one element are different from atoms of another element.

Postulate 3 of Dalton's Atomic Theory supports that we can convert nitrogen into oxygen.

If the total mass of substances before reaction is 5.0 g, then the total mass of products formed should be less than 5.0 g.

A naphthalene ball has the same elemental composition as the gaseous naphthalene formed during sublimation.

If the ratio of masses of B that can combine with a given mass of A is equal to 3, then the Law of Multiple Proportions applies.