An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
Crude oil contains various hydrocarbons like paraffins, naphthenes, aromatics, and asphaltics.
These hydrocarbons are physically combined, not chemically bonded.
A mixture consists of two or more components physically combined.
Therefore, crude oil is best classified as a mixture .
Explanation
Analyze the problem and data We are given the composition of a crude oil sample in terms of the percentages of different hydrocarbons: paraffins (30%), naphthenes (49%), aromatics (15%), and asphaltics (6%). The question asks us to classify the crude oil sample based on this information.
Consider the definitions Let's consider the definitions of the given options:
An element is a pure substance consisting of only one type of atom (e.g., gold, oxygen).
A pure compound is a substance consisting of two or more elements chemically bonded in a fixed ratio (e.g., water, salt).
A pure substance is either an element or a pure compound.
A mixture is a substance consisting of two or more components that are physically combined but not chemically bonded (e.g., air, crude oil).
Classify the crude oil sample Since the crude oil sample contains multiple types of hydrocarbons (paraffins, naphthenes, aromatics, and asphaltics) in varying percentages, it is composed of different substances that are physically combined. These hydrocarbons are not chemically bonded to each other. Therefore, crude oil is best classified as a mixture.
State the final answer Based on the analysis, the best classification for the crude oil sample is a mixture.
Examples
Crude oil classification is essential in the petroleum industry for determining its processing and refining methods. For instance, knowing the composition of crude oil helps engineers design appropriate separation techniques to extract valuable components like gasoline, kerosene, and diesel. If a crude oil sample is found to contain a high percentage of paraffins, it might be suitable for producing waxes and lubricants. Conversely, a crude oil rich in aromatics could be directed towards the production of petrochemicals.
The total charge delivered by the device is 450 coulombs. This corresponds to approximately 2.81 x 10^21 electrons flowing through it during the 30 seconds. The calculations are based on the relationship between current, charge, and the elementary charge of an electron.
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