Q: Using the equation $$E_n = -2.18 \times 10$$^{-18}$$ \frac{1}{n^2$} J $$for hydrogen, what is the energy difference (in J) between the $$n=3$$ and $$n=2$$ levels?

$$2.18 \times 10$$^{-18}$$ \left( \frac{1}{2^2$} - \frac{1}{3^2$} \right)$$

Question 1

Which of the following molecules has a linear molecular geometry according to its Lewis structure?

Accepted Answer

CS\_2

Question 2

Given the electronegativity values in the provided chart, which bond is expected to be the most polar?

Accepted Answer

O-F

Question 3

Using the equation $$E_n = -2.18 	imes 10$$^{-18}$$ \frac{1}{n^2$} J $$for hydrogen, what is the energy difference (in J) between the $$n=3$$ and $$n=2$$ levels?

Accepted Answer

$$2.18 	imes 10$$^{-18}$$ \left( \frac{1}{2^2$} - \frac{1}{3^2$} ight)$$

Question 4

Which of the following molecules contains a central atom that violates the octet rule?

Accepted Answer

PF\_5

Question 5

What is the formal charge on the central atom in the Lewis structure of $$\mathrm{Br_3$^-}$$?

Accepted Answer

0

Question 6

Which of the following molecules is expected to have the highest boiling point due to hydrogen bonding?

Accepted Answer

NH\_3

Question 7

Using the conversion $$1$$ atm $$= 101.3$$ kPa $$= 760$$ Torr, what is the pressure in kPa if a sample is measured at $$2.50$$ atm?

Accepted Answer

$$253.25$$ kPa

Question 8

Which of the following molecules has a trigonal planar electron geometry?

Accepted Answer

BCl\_3

Question 9

Based on the molecular orbital hints, which molecule has a bond order of 2?

Accepted Answer

O\_2

Question 10

Given the constants $$h = 6.626 	imes 10$$^{-34}$$ J·s and c = 2.998$$ 	imes $$10^8 m/s$$, what is the wavelength (in nm) of a photon with energy $$3.00 	imes 10$$^{-19}$$ J?

Accepted Answer

$$\lambda = \frac{hc}{E} = 442 nm$$

Question 11

Which of the following molecules is nonpolar despite having polar bonds?

Accepted Answer

CS\_2

Question 12

What is the electron geometry and molecular geometry of $$\mathrm{$$SiF_4$$}$$?

Accepted Answer

Electron geometry: tetrahedral; Molecular geometry: tetrahedral

Question 13

Which molecule has a central atom with one lone pair and three bonded atoms?

Accepted Answer

PF\_3

Question 14

Which of the following molecules is expected to have the smallest bond angle?

Accepted Answer

PF\_3

Question 15

If a gas expands against a constant external pressure, which equation correctly describes the work done by the gas?

Accepted Answer

$$w = -P \Delta V$$

Question 16

Which molecule has a central atom with sp$$^3$$ hybridization?

Accepted Answer

NH\_3

Question 17

Which of the following molecules contains a triple bond?

Accepted Answer

N\_2

Question 18

What is the molecular geometry of $$\mathrm{Br_3$^-}$$?

Accepted Answer

Linear

Question 19

Which molecule is expected to have the largest dipole moment?

Accepted Answer

CH\_3F

Question 20

Which of the following molecules is expected to be paramagnetic based on its molecular orbital diagram?

Accepted Answer

O\_2

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