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Tutor profile: Mary Z.

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Mary Z.
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Questions

Subject: Organic Chemistry

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Question:

C2H4 + H2 <======> C2H6 What is this type of reaction?

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Mary Z.
Answer:

Addition.

Subject: Chemistry

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Question:

What is a mole?

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Mary Z.
Answer:

A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly 12 grams of carbon-12 (i.e., 6.023 X 10^23).

Subject: Algebra

TutorMe
Question:

Simplify | - x2 + 4x - 4 |.

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Mary Z.
Answer:

| - x2 + 4x - 4 | : given = | -(x2 + 4x - 4) | = | -(x - 2)2 | = (x - 2)2 *Absolute bracket takes away the negative sign.*

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