Chapter 9 Test Flashcards Preview

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Flashcards in Chapter 9 Test Deck (25)
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1
Q

Which of the following Lewis dot structures best represents Cl −?

A

-

2
Q

The electron configuration of argon is 1s22s22p63s23p6.

How many valence electrons does argon have?

A

8

3
Q

How many electrons must be accounted for in the Lewis dot structure for the carbonate ion?

A

24

4
Q

Which of the following is the correct Lewis dot structure of carbon tetrachloride, CCl4?

A

-

5
Q

Which is the correct Lewis dot structure for H2S? In this molecule, the sulfur (S) atom has the same number of valence electrons as an oxygen atom.

A

-

6
Q
Using bond dissociation energy, approximate the enthalpy change for the combustion reaction of 2 moles octane (C8H18 ) and 25 moles oxygen (O2 ) to form carbon dioxide (CO2 ) and water (H2O).
C–C bonds (346 kJ)
C–H bonds (413 kJ)
O=O bonds (498 kJ)
C=O bonds (732 kJ)
O–H bonds (463 kJ)
A

-7238

7
Q

Arrange the following molecules or ions in the order of increasing average C–O bond order. CO, CO2, CO3−

A

CO3-, CO2, CO

8
Q

How many valence electrons are found in an atom of nitrogen?

A

5

9
Q

Which one of the following compounds would you expect to be covalent?

A

OF2

10
Q

Which of the following formulas accurately represents the binary ionic compound formed between magnesium and chlorine?

A

MgCl2

11
Q

Which one of the following binary ionic compounds is expected to have the highest lattice energy?

A

LiI

12
Q

Which of the following molecules has an odd number of valence electrons?

A

NO2

13
Q

For which of the following structures can a resonance structure be drawn?

A

-

14
Q

How many resonance structures can be drawn for a molecule whose structure is best explained by three different Lewis dot structures?

A

3

15
Q

Which statement about resonance hybrids is correct?

A

A resonance hybrid structure describes a molecule’s structure better than any of the contributing resonance structures by itself.

16
Q

To calculate the formal charge on an atom, “ownership” of each electron must first clearly be defined. That is, each electron must be assigned to one atom or another atom. What is the next major step in calculating the formal charge?

A

Subtract the number of electrons assigned to the Lewis dot structure from the sum of the number of valence electrons

17
Q

Which of the following statements is not correct?

A

An atom with a low electronegativity and a formal charge of 0 will have a tendency to acquire another electron.

18
Q

What is electronegativity?

A

Electronegativity is a quantitative measure of the tendency of an atom to attract electrons to itself.

19
Q

Which of the following statement is true regarding the water molecule?

A

The Lewis structure of water shows 2 lone pairs of electrons on oxygen.

20
Q

Which of the following correctly ranks, in order from least to greatest, the distance between bonded atoms of the same element?

A

triple bond, double bond, single bond

21
Q

Which one of the following compounds would you expect to most be ionic?

A

Na2O

22
Q

Which of the following pairs of Lewis dot structures represent correct resonance structures for nitryl chloride, ClNO2?

A

-

23
Q

How many lone pairs of electrons are in the Lewis dot structure of the azide anion, N3−?

A

4

24
Q

Draw the Lewis dot structure of ozone, O3. How many lone pair of electrons is present in the middle oxygen?

A

1

25
Q

Which of the following binary ionic compounds has the lowest lattice energy?

A

LiI

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