Question

Which of the following describes a compound? ( hint: carbon and oxygen both appear on the periodic table)
A. a piece of carbon, containing only carbon atoms
B. oxygen gas surrounding a solid piece of carbon
C. a substance made of two oxygen atoms for each carbon atom
D. carbon and oxygen atoms mixed without being bonded together

Answer 1

It is option C.
Carbon and oxygen form a molecule only when their atoms are bonded together. If they're in a mixture, it means they are not bonded.

Answer 2

Answer: The correct option is C.

Explanation: A compound is defined as a chemical substance in which two or more different elements combine chemically in a definite proportion.

Option A: Here, only carbon atoms are present, so it does not form a compound.

Option B: Here oxygen and carbon, Two elements are present but they are not chemically bonded. Carbon element is just surrounded by the oxygen gas. Therefore, it is not considered as a compound.

Option C: In this, the carbon and oxygen elements are chemically bonded to form a substance which contains two oxygen atoms for each carbon atoms. Hence, form a compound. The formula for this substance is $CO_2$

Option D: In this option, both the elements are mixed together but are not chemically boded. Hence, it is not considered as a compound.