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Tutor profile: Crystal W.

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Crystal W.
Doctoral Candidate in Chemistry
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Questions

Subject: Organic Chemistry

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Question:

Rank the following nucleophiles from strongest to weakest: -NH2, NH3, -OH?

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Crystal W.
Answer:

-NH2 > -OH > NH3; As electronegativity decreases, nucleophilicity increases. This makes -OH weaker than -NH2 because O is more electronegative than N. Nucleophiles donate 2 electrons; therefore, -NH2 has a negative charge while NH3 is neutral making -NH2 more nucleophilic. Any species with an associated negative charge is more nucleophilic than a neutral molecule.

Subject: Inorganic Chemistry

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Question:

Why are some octahedral complexes low spin, while others are high spin?

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Crystal W.
Answer:

If the delta value is large, electrons tend to fill the 3 lower energy orbitals first causing the complex to be low spin. When the delta value is small, electrons can fill all 5 orbitals before pairing because the energy gap is not large, creating a high spin complex.

Subject: Chemistry

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Question:

What is the oxidation state of bromine in bromic acid, HBrO3?

Inactive
Crystal W.
Answer:

+5; To calculate the oxidation state, O is assigned -2 and there are 3. The total charge on O is -6. Then H always has +1. Then we can solve for what the oxidation state must be for Br. (-6 + 1 = -5) This means that Br must have an oxidation state of +5 to keep the charge on the entire compound to be 0.

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