Answer:
Functional groups
Explanation:
A functional group refers to an atom or cluster of atoms that are covalently bonded to carbon and influence the behavior of organic compounds.
There are several functional groups in organic chemistry that determine the properties of organic compounds.
For instance, in the compound CH3CH2CH2CH2OH, the functional group is the -OH group. The chemical and physical properties of this compound is largely determined by this functional group.
Since this is Argon it would be a noble gas
The substance will not sink in water, as it Dencity is (0.5)is less than the density of water (1gcm).
Mixtures are combinations of materials that can be separated by in most cases time. For instance, oil and water is a mixture. You can tell this by placing the two chemicals in a container and shaking them. They will mix and look like one substance, however, they will separate into the two liquids after some time is given. Assuming that "pure substance" is a solution, a substance is similar to a mixture, but the materials used in the solution are not separable. Over time the materials in the containing will not separate. I believe this is the answer you are looking for.
The changing of the composition of rocks by heat pressure or other natural agency.
I paraphrased from a google search :
https://www.google.com/search?q=metamorphism&rlz=1C1GCEU_en___US848&oq=metamorphism&aqs=chrome..69i57j69i61j0l4.3674j0j7&sourceid=chrome&ie=UTF-8
