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Flashcards in Chapter IV Deck (72):
1

Which group of elements in the periodic table is characterized by an especially stable electron arrangement?

8A

2

The structural difference between a sodium atom and a sodium ion is that the sodium ion has one

Less electron than the sodium atom

3

Which of the following are isoelectronic?

S^2- and Ar

4

Which of the following cations is isoelectronic with S^2-?

Ca^2+

5

How many dots surround B in the Lewis dot symbol for boron?

3

6

How many dots surround Br in the Lewis dot symbol for Br^-?

8

7

Which of the following Lewis dot symbols is incorrect? (This question is asked twice; this is the first time.)

Li:

8

Which of the following Lewis dot symbols is incorrect? (This question is asked twice; this is the second time.)

.As:

9

A potassium ion and an argon atom have the same

Electron configuration

10

How many dots are shown on the Lewis symbol for chloride ion, and what is the ion's charge?

Eight dots, negative charge

11

The bonding between Li^+ ions and F^- ions in lithium fluoride is

Ionic

12

Which group of elements will form stable ions with a 2- charge?

6A

13

Which of the following pairs of elements would be most likely to form an ionic compound with each other?

Cs and Se

14

Oxygen forms a simple (monoatomic) ion with a charge of

2-

15

Strontium forms a simple (monoatomic) ion with a charge of

2+

16

Ca and P react to form Ca3P2, an ionic compound. How many electrons are there in the valence shell of the P^3- (phosphide) ion?

8

17

The formula of the ionic compound formed by lithium and nitrogen is (this is the only stable nitride of an alkali metal)

Li3N

18

The formula of the ionic compound formed by magnesium and bromine is

MgBr2

19

Only one of the following ions is likely to be formed in an ordinary chemical reaction; it is

Br^-

20

The formula for the binary ionic compound of barium and sulfur is

BaS

21

Which of the following formulas is correct?

ZnCl2

22

Which of the following formulas is incorrect?

Al3P2

23

The correct name for KCl is

Potassium chloride

24

The correct name for Al2S3

Aluminum sulfide

25

The correct name for LiBr is

Lithium bromide

26

The correct name for ZnI2 is

Zinc iodide

27

A bond formed when two atoms share one pair of electrons is

Single covalent

28

What type of a bond forms when two atoms in group 7A combine to form a diatomic molecule?

Single covalent

29

How many pairs of nonbonding electrons does an atom of oxygen have when it forms a double covalent bond with another atom of oxygen?

2

30

The bond in Br2

Nonpolar single covalent

31

Carbon monoxide possesses a ___ bond.

Trisingle ionic

32

When HCl is formed,

A pair of valence electrons is shared, one each from the H atom and the Cl atom

33

Which of the following bonds is the most polar?

C—F

34

In which of the following pairs does carbon have the smallest share of electrons?

C—F

35

In a polar covalent bond, the atom with the partial negative charge is

More electronegative

36

For an ionic bond to exist between two atoms, their difference in electronegativity should be

Greater than 2.0

37

The formula for phosphorus trichloride is

PCl3

38

The formula for sulfur hexafluoride is

SF6

39

The correct name for N2S4 is

Dinitrogen tetrasulfide

40

The correct name for I2O5 is

Diiodine pentaoxide

41

When two H atoms each share an electron with an O atom to form H2O, the bonding is

Polar covalent

42

How many electrons are in the valence shell of the C atom in a methane molecule?

8

43

In which of the following molecules does hydrogen satisfy the duet rule?

All (H2, H2, and CH4)

44

Which of the following compounds incorporates a polyatomic ion?

K2SO3

45

The formula for ammonium phosphate is

NH4(PO4)2

46

The formula for sodium hydrogen carbonate is

NaHCO3

47

The formula for copper(I) hydrogen sulfate is

CuHSO4

48

The formula for ammonium dichromate is

(NH4)2Cr2O7

49

The correct name for NH4HCO3 is

Ammonium hydrogen carbonate

50

Sodium cyanide can be used in the extraction of gold according to the processes shown:

4 Au + 8 NaCN + O2 + 2 H20 ---> 4 Na[Au(CN)2] + 4 NaOH

Which compound (or compounds) contain a polyatomic ion?

All (NaCN, Na[Au(CN)2], and NaOH)

51

In the chemical equation below, what is the correct name for NaCN?

4 Au + 8 NaCN + O2 + 2 H20 ---> 4 Na[Au(CN)2] + 4 NaOH

Sodium cyanide

52

How many lone pairs of electrons are there in the Lewis formula of CF4?

12

53

How many lone pairs of electrons are there in the Lewis formula of CF2Cl2?

12

54

How many unpaired electrons are there in the Lewis formula of H2O2?

8

55

How many unpaired electrons are there on S in SCl2?

0

56

the Lewis formula for CCl4 has

24 unshared electrons

57

The correct Lewis formula for carbon dioxide is

:O:==C==:O:

58

The correct Lewis formula for the Cl2O molecule is

::C:— :O:—::Cl:

59

In the Lewis formula for SO2, the number of lone pairs of electrons in the outer shell of the central atom is

1

60

Which of the following species does not have a triple bond in its Lewis formula?

O2

61

The Lewis formula for the SO3^2- ion that follows the octet rule is

::O:—:S—::O ( whole thing to the ^2-)
I
I
::O:

62

Which of the following molecular shapes cannot be formed form the tetrahedral arrangement of the electron sets?

Linear

63

Which of the following molecular shapes can be formed from the trigonal

Bent

64

Which of the following molecules and polyatomic ion has the smallest O—S—O bond angle?

SO3^2-

65

What is the molecular shape of CS2?

Linear

66

What is the molecular shape of OF2?

Bent

67

What is the molecular shape of SiF4?

Tetrahedral

68

What is the molecular shape of NH3?

Trigonal pyramidal

69

Which of the following molecules is polar? (This question is asked twice; this is the first time.)

NH3

70

Which of the following molecules is non polar?

CCl4

71

Which of the following molecules is polar? (This question is asked twice; this is the second time.)

HCN

72

Which of the following molecules has polar bonds but is nonpolar?

SiF4