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Stephanie T.
General Chemistry Tutor for 7.5 years, now Science Writer/Research Analyst, Pre-med undergrad
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SAT II Chemistry
TutorMe
Question:

When asked to find the amount of yield of a specific product, when must you consider if the problem involves a limiting reactant?

Stephanie T.
Answer:

Limiting reactions must be considered in problems where amounts (mass, moles, volume+molarity) of both reactants are given. In problems that do not involve a limiting reaction, the wording of the problem will often denote which reactant is in excess.

Chemistry
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Question:

What is the difference between a polar bond and a polar molecule?

Stephanie T.
Answer:

A polar bond is based on an electronegativity difference between two bonded atoms, while a polar molecule relates more to the symmetry based on the VSEPR theory and not whether we could draw a Lewis structure in a symmetrical manner.

Basic Chemistry
TutorMe
Question:

What is the only situation in which the balanced chemical equation can have fractional coefficients?

Stephanie T.
Answer:

Heat of formation reactions are the only situation in which balanced chemical equations can have fractional coefficients.

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