Oracle IAS, the best coaching institute for UPSC/IAS/PCS preparation in Dehradun brings to you UKPCS Science Chemistry (paper 6). 

What is the difference between a compound and a molecule?

• A molecule is formed when two or more atoms join together chemically. A compound is a molecule that contains at least two different elements. All compounds are molecules but not all molecules are compounds.
• Molecular hydrogen (H₂), molecular oxygen (O₂) and molecular nitrogen (N₂) are not compounds because each is composed of a single element. Water (H₂O), carbon dioxide (CO₂) and methane (CH₄) are compounds because each is made from more than one element. The smallest bit of each of these substances would be referred to as a molecule. For example, a single molecule of molecular hydrogen is made from two atoms of hydrogen while a single molecule of water is made from two atoms of hydrogen and one atom of oxygen.

So, in summary:

• Element – a basic substance that can’t be simplified (H,O ..)
• Atom – the smallest amount of an element
• Molecule – two or more atoms that are chemically joined together (H₂, O₂, H₂O, etc…)
• Compound – a molecule that contains more than one element (H₂O, C₆H₁₂O₆, etc…)
  

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Hemant Bhatt

Chief Mentor at Oracle IAS

Hemant Bhatt is a B. Tech from Pantnagar University and has studied Social Sciences at SciencesPo, Paris. He teaches at Oracle IAS, Dehradun.
He is a bibliophile and a fitness enthusiast.

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