Question 1

Which of the following molecules is considered nonpolar, even though it has a small difference in electronegativity ($$\Delta EN$$)?

Accepted Answer

CH$$_4$$

Question 2

Given the Aufbau principle, what is the correct order of filling for the following orbitals?

Accepted Answer

$$4s \rightarrow 3d \rightarrow 4p$$

Question 3

A molecule of CO$$_2 is $$linear. What is the bond angle between the oxygen-carbon-oxygen atoms?

Accepted Answer

$$180^\circ$$

Question 4

Which element on the periodic table has the highest electronegativity?

Accepted Answer

Fluorine

Question 5

How many valence electrons are present in a molecule of C$$_2H$_6$$?

Accepted Answer

14

Question 6

Which of the following electron configurations represents Sulfur (S)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^4$$

Question 7

What type of bond is formed between sodium (Na) and oxygen (O) in Na$$_2O$$?

Accepted Answer

Ionic

Question 8

Which statement best explains why C-H bonds are considered nonpolar?

Accepted Answer

The difference in electronegativity ($$\Delta EN) is $$less than 0.5.

Question 9

How many lone pairs of electrons are present in a molecule of H$$_2O$$?

Accepted Answer

2

Question 10

Which of the following is the correct Lewis structure for C$$_2H$_4O$$?

Accepted Answer

A structure with a double bond between C and O, and all hydrogens attached to carbons.

Question 11

What is the total number of valence-shell electrons in the CO$$_3$$^{2-}$$ ion?

Accepted Answer

24

Question 12

Which of the following statements about water (H$$_2O) is $$true?

Accepted Answer

None of the above.

Question 13

Which of the following best describes the bond type in CaF$$_2$$?

Accepted Answer

Ionic

Question 14

When an electron moves from the $$n=4$$ level to the $$n=1$$ level, what happens?

Accepted Answer

Light energy is emitted because energy must be conserved.

Question 15

Which of the following statements is true regarding resonance in benzene?

Accepted Answer

The 6-membered ring contains resonance.

Question 16

Which element has the electron configuration $$[Ne] 3s^2$ 3p^5$?

Accepted Answer

Chlorine

Question 17

Which of the following is the result of the wavelike nature of electrons?

Accepted Answer

Resonance

Question 18

What is the closest bond angle in the C-O-C bond in aspirin?

Accepted Answer

$$109.5^\circ$$

Question 19

How many valence shell electrons are there in Si?

Accepted Answer

4

Question 20

Which of the following is most likely to accept electrons than to donate electrons?

Accepted Answer

Fluorine (F)

Introduction to Chemistry: Exam 1 Study Guide

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