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Tutor profile: Jennifer P.

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Jennifer P.
Current PhD Student with Master's in Chemistry
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Questions

Subject: Organic Chemistry

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Question:

Why do carbon chains that don't have long substituents have a higher boiling point than carbon chains that do have long substituents?

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Jennifer P.
Answer:

Carbon chains that don't have long substituents are able to get very close to each other in a mixture and essentially stack on each other. This creates stronger intermolecular forces since the atoms are closer to each other, which raises the boiling point. However, carbon chains that have long substituents cannot get close together to create strong intermolecular forces, so their boiling point will not be as high.

Subject: Chemistry

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Question:

Why does heat make reactions go faster?

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Jennifer P.
Answer:

Temperature affects the rate of reactions. A higher temperature increases the rate while a lower temperature decreases the rate. This is because higher temperatures increase the speed at which molecules move, which increases the chance that they will collide. When molecules collide, it creates a reaction. The more collisions you have, the more reactions you'll get and thus, the reaction will be faster.

Subject: Biology

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Question:

What is the difference between evolution and natural selection?

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Jennifer P.
Answer:

Evolution is when characteristics of a species change over many generations, due to mutations in their genetic code. Natural selection is when certain organisms survive due to having a more advantageous characteristic for survival.

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