Question 1

Which molecular geometry is expected for a molecule with five electron groups around the central atom, one of which is a lone pair?

Accepted Answer

Seesaw

Question 2

Given the average bond energies, which reaction is most exothermic?

Accepted Answer

Formation of HCl from H$$_2$$ and Cl$$_2$$

Question 3

Which of the following solvents would be most effective at dissolving NaCl?

Accepted Answer

Water

Question 4

What is the bond angle in a molecule with a trigonal planar geometry?

Accepted Answer

$$120^\circ$$

Question 5

Which phase of water has the highest specific heat capacity?

Accepted Answer

Liquid

Question 6

A sample of ethanol is heated from $$25^\circC to $$its boiling point ($$78.5^\circC). If $$the specific heat of ethanol is $$2.44 J/g$\cdot$$°C, how much heat is required to heat $$50 g of $$ethanol?

Accepted Answer

$$6,500 J$$

Question 7

Which of the following molecules has the shortest bond length?

Accepted Answer

H–H

Question 8

Which of the following statements about heats of vaporization ($$\Delta H_{vap}) $$and fusion ($$\Delta H_{fus}) is $$correct?

Accepted Answer

$$\Delta H_{vap} is $$always larger than $$\Delta H_{fus}$$ for a given substance.

Question 9

Which of the following molecules has a bond angle closest to $$109.5^\circ$$?

Accepted Answer

CH$$_4$$

Question 10

If the bond energy of H–F is $$565 kJ/$$mol and that of H–Cl is $$431 kJ/$$mol, which bond is stronger and why?

Accepted Answer

H–F, because fluorine forms shorter and stronger bonds.

Question 11

Which of the following liquids has the highest normal boiling point?

Accepted Answer

Water

Question 12

A molecule with four electron groups and two lone pairs around the central atom will have which molecular geometry?

Accepted Answer

Bent (V-shaped)

Question 13

Which of the following bonds has the highest bond energy?

Accepted Answer

C≡C

Question 14

Which solvent would be best for recrystallizing a polar organic compound?

Accepted Answer

Water

Question 15

What is the expected molecular geometry for SF$$_6$$?

Accepted Answer

Octahedral

Question 16

Which of the following statements about bond length and bond energy is correct?

Accepted Answer

Shorter bonds are generally stronger.

Question 17

If you mix 100 g of water at $$25^\circC $$with 100 g of ethanol at $$25^\circC$$, which liquid will require more energy to heat to $$50^\circC$$?

Accepted Answer

Water, because it has a higher specific heat capacity.

Question 18

Which of the following molecules is expected to have a bond angle of $$180^\circ$$?

Accepted Answer

CO$$_2$$

Question 19

Which of the following has the lowest heat of vaporization at its boiling point?

Accepted Answer

Mercury

Question 20

A molecule with six electron groups and two lone pairs around the central atom will have which molecular geometry?

Accepted Answer

Square planar

Intermolecular Forces, Molecular Geometry, and Properties of Liquids: Key Concepts in General Chemistry

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