Yes. Carbon 14 is more reactive then carbon 12.
The most polar bond would be between carbon and fluorine. Fluorine is the most electronegative element, creating a large electronegativity difference with carbon and resulting in a highly polar bond.
The difference would lie in their atomic mass. The number of neutrons in an atom affects its atomic mass, which is the sum of the protons and neutrons in the nucleus. Therefore, two atoms of carbon with the same number of neutrons would have the same atomic mass.
The bond between carbon and chlorine is more polar than the bond between carbon and sulfur. To compare bond polarities, compare the difference in the electronegativities between the atoms. The difference between carbon (with an electronegativity of 2.55) and sulfur (2.58) is 0.03. The difference between carbon (2.55) and chlorine (3.16) is 0.61. Since the difference between C and Cl is larger than the difference between C and S, the C-Cl bond is more polar.
You stated that carbon dioxide and nitrogen are present, but you did not mention oxygen. Nothing burns without oxygen . . . If you expose limewater to carbon dioxide, it will get cloudy, but will not if you expose it to nitrogen.
The limewater test can differentiate between carbon dioxide and nitrogen. When carbon dioxide is bubbled through limewater, it turns milky due to the formation of calcium carbonate. Nitrogen will not have this effect on limewater.
The difference would be 0.05.
Density would be the most noticeable difference between the rock and the model.
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Petrol, is different from Kerosene because the hydrocarbons that you find in Petrol will generally have less hyrdogen and carbon atoms than Kerosene would have. E.g. the hydrocarbons that make up Petrol may have in between 4 to 12 carbon and 10 to 26 hydrogen atoms, whereas Kerosene would have between 6 to 16 carbon and 14 to 34 hydrogen atoms.
Mixing sodium metal with carbon dioxide would likely result in the formation of sodium oxide and carbon. This reaction could release heat and may even be exothermic. It is essential to handle sodium with care due to its high reactivity with oxygen and other elements.
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