To determine the best classification for the given sample of crude oil, we first need to analyze the provided percentages of different hydrocarbons.
The table shows the following hydrocarbons in the sample:
- Paraffins: 30%
- Naphthenes: 49%
- Aromatics: 15%
- Asphaltics: 6.0%
Let's break down each classification:
1. Element: An element is a pure chemical substance consisting of one type of atom. Since the sample contains multiple substances (different hydrocarbons), it cannot be classified as an element.
2. Pure Compound: A pure compound consists of molecules that are all identical, each composed of two or more atoms in a fixed proportion. Since the given sample contains multiple types of hydrocarbons in varying percentages, it is not a pure compound.
3. Pure Substance: A pure substance is either an element or a compound that has consistent and uniform properties throughout. As we have multiple hydrocarbons with varying properties and percentages, it cannot be a pure substance.
4. Mixture: A mixture contains two or more substances that are physically combined in varying ratios and can be separated by physical means. The hydrocarbons in the sample are mixed in different proportions, thus fitting the definition of a mixture.
Having considered the definitions and the given percentages of different hydrocarbons in the sample, the most appropriate classification for this sample of crude oil is:
A mixture.
