Question 1

Which of the following electron configurations correctly represents the ground state of phosphorus (Z = 15)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^3$$

Question 2

Which element is the most electronegative among the following Group 7A elements?

Accepted Answer

F

Question 3

In the molecule ethanol ($$CH_3CH_2OH$$), which statement about the oxygen atom is correct?

Accepted Answer

Oxygen possesses 8 octet electrons: 6 valence and 2 shared electrons.

Question 4

What is the formal charge on the nitrogen atom in ammonia ($$NH_3$$)? Use the formula: $$	ext{Formal Charge} = 	ext{Group Number} - 	ext{Valence Electrons}.$$

Accepted Answer

$$0$$

Question 5

Which of the following is the best Lewis Dot Structure for $$CO_2$$?

Accepted Answer

O=C=O, with each oxygen having two lone pairs

Question 6

Which resonance structure is possible for the nitrite ion ($$NO_2$$^-$$)?

Accepted Answer

One oxygen has a double bond to nitrogen and two lone pairs, the other has a single bond and three lone pairs

Question 7

What is the hybridization of the central atom in $$HCN$$?

Accepted Answer

$$sp$$

Question 8

Is nitrogen trifluoride ($$NF_3) $$polar or nonpolar?

Accepted Answer

Polar, because the molecule has a lone pair and asymmetric shape

Question 9

Which functional group is present in the following structure: $$CH_3COOH$$?

Accepted Answer

Carboxylic acid

Question 10

Which statement about isotopes is correct?

Accepted Answer

Isotopes have the same atomic number but different mass numbers

Question 11

Which principle is violated in the following electron configuration diagram for oxygen: $$1s^2$$\ $$2s^2$$\ $$2p^4 ($$with two electrons paired in one $$2p$$ orbital and two unpaired in the other two $$2p$$ orbitals)?

Accepted Answer

Hund's Rule

Question 12

Which of the following best describes a sigma ($$\sigma) $$bond?

Accepted Answer

A bond formed by the end-to-end overlap of orbitals along the internuclear axis

Question 13

Which molecule violates the octet rule?

Accepted Answer

$$BF_3$$

Question 14

What is the formal charge on the oxygen atom in the molecule $$H_2CO ($$formaldehyde)?

Accepted Answer

$$0$$

Question 15

How many implied hydrogens are present on the carbon atom labeled in the skeletal structure below (assume the carbon is part of a benzene ring)?

Accepted Answer

0

Question 16

Which of the following molecules is saturated?

Accepted Answer

Cyclohexane

Question 17

What is the degree of unsaturation (HD) for $$C_4H_6$$?

Accepted Answer

2

Question 18

Which of the following pairs are constitutional isomers?

Accepted Answer

Ethanol and dimethyl ether

Question 19

Which of the following molecules contains a net dipole moment?

Accepted Answer

$$CH_3OH$$

Question 20

What is the hybridization and geometry of the central atom in $$NH_3$$?

Accepted Answer

$$sp^3$$, trigonal pyramidal

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