University of Toronto CHMA10: 2nd Midterm Test Review Questions and Answers

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University of Toronto




2nd Midterm Test Review Questions
and Answers




Course: CHMA10 Introductory Chemistry I

, CHMA10 2nd Term Test

Name Student Number


MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

1) Place the following in order of increasing X-A-X bond angle, where A represents the central atom 1)
and X represents the outer atoms in each molecule.


HCN H2O H3O⁺

A) H3O⁺ < H2O < HCN

B) HCN < H3O⁺ < H2O

C) H2O < H3O⁺ < HCN

D) H3O+ < HCN < H2O
E) H2O < HCN < H3O⁺


2) The volume of a gas is inversely proportional to the pressure of a gas. What is this known as? 2)
A) Dalton's law
B) Avogadro's law
C) Charles's law
D) Boyle's law
E) Ideal gas law


3) Identify the substance that conducts electricity most effectively. 3)
A) sugar dissolved in water
B) NaCl dissolved in water
C) solid NaCl
D) solid sugar
E) water

4) Choose the bond below that is most polar. 4)
A) C-O B) C-C C) C-N D) C-F E) F-F


5) A mixture of 0.220 moles CO, 0.350 moles H2, and 0.640 moles He has a total pressure of 2.989 bar. 5)
What is the pressure of H2?
A) 0.865 bar B) 1.03 bar C) 0.649 bar D) 0.969 bar E) 1.17 bar


6) Which of the following resonance structures for OCN⁻ will contribute most to the correct structure 6)
of OCN⁻?
A) O(2 lone pairs)=C=N(2 lone pairs)
B) O(3 lone pairs)-C≡N(1 lone pair)
C) O(1 lone pair)≡C-N(3 lone pairs)
D) O(1 lone pair)=C(2 lone pairs)=N(1 lone pair)
E) They all contribute equally to the correct structure of OCN⁻.




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