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Chemistry > Chapter 7 > Flashcards

Chapter 7 Flashcards

1
Q

What is the oxidation number of hydrogen in MgH2

A

-1

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2
Q

What is the oxidation number of sulfur in S8

A

0

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3
Q

What is the oxidation number of Cu in Cu2S

A

+1

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4
Q

What is the oxidation number of Cr in Na2CrO4

A

+6

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5
Q

What is the oxidation number of C in HCO3-1

A

+4

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6
Q

What is the oxidation number of N in NH4+1

A

-3

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7
Q

What is the oxidation number of Br in HBrO3

A

+5

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8
Q

What is the oxidation number of S in Na2S2O3

A

+2

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9
Q

How many atoms are represented by the formula Ca(HSO4)2

A

13 atoms

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10
Q

Assign the oxidation number to the sulfur in Ca(HSO4)2

A

+6

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11
Q

Arrange the following in order of increasing oxidation number of the nitrogen atom: N2, NH3, N2O4, NO3-1, N2O

A

NH3, N2, N2O, N2O4, NO3-1

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12
Q

What is the number of atoms in 7.46g Li

A

6.51 x 1023atoms

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13
Q

What is the number of molecules in 43.0 g NH3

A

1.52 x 1024 molecules

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14
Q

What is the number of formula units in 159g lead (ii) chromate

A

2.96 x 1023formula units

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15
Q

What is the number of SO4-2ions in 14.3g Cr2(SO4)3

A

6.58 x 1022ions

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16
Q

An oxide of osmium (Os) is a pale yellow solid. If 2.89g of the compound contains 2.16g osmium, what is its empirical formula?

A

OsO4

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17
Q

Find the percent composition of aspirin, C9H8O4

A

C = 60.0%

H = 4.4%

O = 35.6%

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18
Q

Sorbic acid is added to food to inhibit mold. Its composition is 64.30% carbon, 7.20% hydrogen, and 28.50% oxygen, and its gram molecular weight is 112.0 g/mole. What is its molecular formula?

A

C6H8O2

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19
Q

Ribose is an important sugar with a molar mass of 150.0 g/mole. If its empirical formula is CH2O, what is its molecular formula?

A

C5H10O

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20
Q

An alloy of iron (54.7%), nickel (45.0%) and manganese (0.30%) has a density of 8.17g/cm3. How many iron atoms are there in a block of alloy measuring 10.0cm x 20.0cm x 15.0cm

A

1.45 x 1026 iron atoms

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21
Q

Arrange the following in order of increasing mass, from smallest to largest:

A. 25g of oxygen gas

B. 1.00 mole of H2O

C. 3.00 x 1023 molecules of C2H6

D. 2.00 x 1023 molecules of C2H6O2

A

C, B, D, A

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22
Q

Name Na2CrO4

A

sodium chromate

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23
Q

Name AgCl

A

silver chloride

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24
Q

Name K2S2O3

A

potassium thiosulfate

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25
Q

Name SO3

A

sulfur trioxide

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26
Q

Name Fe2(SO4)3

A

iron(iii) sulfate

or

ferric sulfate

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27
Q

Name Zn(C2H3O2)2

A

zinc acetate

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28
Q

Name HNO3

A

nitric acid

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29
Q

Name CaBr2

A

calcium bromide

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30
Q

Name H2CO3

A

carbonic acid

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31
Q

Name Na2O2

A

sodium peroxide

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32
Q

Name Ba(OH)2

A

barium hydroxide

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33
Q

Name AlCl3 • 6H20

A

aluminum chloride hexahydrate

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34
Q

Name HBr

A

hydrobromic acid

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35
Q

Name HMnO4

A

permanganic acid

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36
Q

Name PbCl4

A

lead(iv) chloride

37
Q

H2SO3

A

sulfurous acid

38
Q

Name HC2H3O2

A

acetic acid

39
Q

Name MgO

A

magnesium oxide

40
Q

Name NaClO

A

sodium hypochlorite

41
Q

Name NO2

A

nitrogen dioxide

42
Q

Write the formula for aluminum oxide

43
Q

Write the formula for chlorous acid

44
Q

Write the formula for cupric chloride dihydrate

A

CuCl2• 2H2O

45
Q

Write the formula for chromium(iii) fluoride

46
Q

Write the formula for silicon tetrabromide

47
Q

Write the formula for ammonium bromide

48
Q

Write the formula for potassium hydroxide

49
Q

Write the formula for cobalt(iii) dichromate

A

Co2(Cr2O7)3

50
Q

Write the formula for calcium phosphate

51
Q

Write the formula for carbon dioxide

52
Q

Write the formula for hydrochloric acid

53
Q

Write the formula for phosphoric acid

54
Q

Write the formula for silver carbonate

55
Q

Write the formula for potassium cyanide

56
Q

Write the formula for ferric sulfide

57
Q

Write the formula for phosphorus tribromide

58
Q

Write the formula for hydrosulfuric acid

59
Q

Write the formula for cadmium phosphide

60
Q

Write the formula for barium perchlorate

61
Q

Write the formula for mercury(ii) acetate

A

Hg(C2H3O2)2

62
Q

Calculate the molar mass of Zn(ClO4)2

A

264.4 g/mole

63
Q

How many moles in 988g of copper(ii) sulfate

A

6.19 moles

64
Q

How many molecules in 15.0 grams of chlorine gas

A

1.27 x 1023 molecules

65
Q

How many grams in 9.03 x 1024 formula units of sodium dichromate

A

3.93 x 103 g

66
Q

Find the percent composition of C4H6O2, a compound used to make plexiglass

A

C = 55/8%

H = 7.0%

O = 37.2%

67
Q

Find the gram-molecular weight of carbon dioxide

A

44.0 g/mole

68
Q

What is the empirical formula of a compound that is 43.6% phosphorus and 56.4% oxygen

69
Q

How many oxygen atoms in 165 grams of potassium dichromate

A

2.36 x 1024 oxygen atoms

70
Q

How many molecules in 1250 g of water

A

4.18 x 1025 molecules

71
Q

Find the molecular formula of caffeine which is 49.5% C, 5.15% H, 28.9% N, and 16.5% O, and has a molar mass of 194 g/mole

72
Q

How many moles in 358g of ammonium cyanide

A

8.14 moles

73
Q

Calculate the mass of 3.15 moles of carbonic acid

74
Q

Calculate the percent water in AlCl3 • 6H2O

75
Q

How many formula units in 1.15 kg of aluminum bromide

A

2.60 x 1024 formula units

76
Q

Determine the empirical formula for a compound that is 42.1% sodium, 18.9% phosphorus, and the rest oxygen

77
Q

What mass of phosphoric acid contains 5.00 grams of hydrogen

78
Q

A hydrate of calcium nitrate is heated and loses 30.5% of its mass. What is the formula of the hydrate

A

Ca(NO3)2 • 4H2O

79
Q

Calculate the percent composition of magnesium nitrate

A

Mg = 16.4%

N = 18.9%

O = 64.7%

80
Q

Give each atom an oxidation number in:

KMnO4

A

K = +1

Mn = +7

O = -2

81
Q

Give each atom an oxidation number in:

S2O3-2

A

S = +2

O = -2

82
Q

Give each atom an oxidation number in:

Mg

83
Q

Give each atom an oxidation number in:

Na2CO3

A

Na = +1

C = +4

O = -2

84
Q

Give each atom an oxidation number in:

Fe3(PO4)2

A

Fe = +2

P = +5

O = -2

85
Q

Give each atom an oxidation number in:

Zn(NO3)2

A

Zn = +2

N = +5

O = -2

86
Q

Give each atom an oxidation number in:

O2

87
Q

Give each atom an oxidation number in:

AsO4-3

A

As = +5

O = -2

Chemistry (9 decks)

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