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Math Physics Chemistry

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* YU: York University; UofT: University of Toronto; McM: McMaster University; UWO: University of Western Ontario

Students are encouraged to submit questions they entounted in their studies of the University courses (General Chemistry, Organic Chemistry and Physics). Dr. Ma will select some of them and post answers biweekly.

Physics

Questions and Answers

Answer:

Organic Chemistry

General Chemistry

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Question from Physics 1B03
at McMaster University:

Question from course Chem 1000
at York University:

A sample of an unknown gas takes 434 s to effuse through a small hole in a container. An equal number of moles of hydrogen chloride, HCl, gas takes 638 s to effuse through this hole under the same conditions. What is the molar mass of the unknown gas?
Determine whether following structures are chiral or not.
It is chiral. The carbon connected with 4 different groups is stereogenic centre. Its configuration is S.
It is also chiral. Its mirror image is not superimposable.

A 95.0 kg basketball player can leap straight up in the air to a height of 100.0 cm. The player bends his leg until the upper part of his body is dropped by 40 cm, then he begins his jump. a) With what speed must the player leave the ground to reach a height of 100 cm? b) What was his acceleration, assumed to be constant, as he jumped (before his feet left the ground)? c) What does the scale read before he begins his jump if he standing on a scale that reads in newton? d) What does the scale read after his feet leave the ground? e)What does the scale read as he jumps?

Question from course Chem 2020
at York University:

Answer:

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