Which of these substances are compounds?
I. Neon
II. Crude oil
III. Water
IV. Sodium chloride

Question

Quizplus · Accepted Answer

- Neon is an element, not a compound, so I is incorrect.
- Crude oil is a mixture of many different compounds, so II is incorrect.
- Water is a compound because it consists of two different elements (hydrogen and oxygen) chemically bonded together, so III is correct.
- Sodium chloride is also a compound because it consists of two different elements (sodium and chlorine) chemically bonded together, so IV is correct.
Therefore, the only substances that are compounds are III (water) and IV (sodium chloride), making choice D the correct answer.

Which of These Substances Are Compounds