Let's analyze the given information step by step to determine the best classification for the sample of crude oil.
1. Identify the Percentages of Hydrocarbons:
- Paraffins: 30%
- Naphthenes: 49%
- Aromatics: 15%
- Asphaltics: 6.0%
2. Recognize the Components:
- The sample contains multiple types of hydrocarbons in different percentages.
3. Determine the Classification Based on Definition:
- An element is a substance that is made entirely from one type of atom and cannot be broken down into simpler substances. Since the sample contains multiple types of hydrocarbons, it is not an element.
- A pure compound consists of molecules that are all the same and contain two or more types of atoms in a specific ratio and structure. However, the sample contains different types of hydrocarbons, not a single type of molecule.
- A pure substance can either be a single element or a single compound with a uniform structure. Given the different hydrocarbons present, it does not fit this classification.
- A mixture contains two or more substances that are physically combined but not chemically bonded, and they can vary in composition. Since the sample contains different hydrocarbons with varying percentages, it fits the definition of a mixture.
4. Conclusion:
- The sample of crude oil, containing a variety of hydrocarbons in different proportions, is best classified as a mixture.
Therefore, the best classification for this sample of crude oil is a mixture.
