Question

why carbon di oxide is a compound? ​

Answer 1

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Because it is made of two elements carbon and oxygen join together in fix ratio 3:4 by mass.

and have entirely different property than carbon and oxygen.

Answer 2

1) It has different chemical and physical properties from the carbon and oxygen that makes it.

2) you can only separate carbon from oxygen in carbon dioxide using a chemical reaction.

3) you cannot vary the amount of carbon or oxygen in a carbon dioxide molecule.

4) carbon and oxygen that make carbon dioxide are chemically bonded to form this compound