Chapter 7 Flashcards

(88 cards)

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
Name SO3
sulfur trioxide
26
Name Fe2(SO4)3
iron(iii) sulfate or ferric sulfate
27
Name Zn(C2H3O2)2
zinc acetate
28
Name HNO3
nitric acid
29
Name CaBr2
calcium bromide
30
Name H2CO3
carbonic acid
31
Name Na2O2
sodium peroxide
32
Name Ba(OH)2
barium hydroxide
33
Name AlCl3 • 6H20
aluminum chloride hexahydrate
34
Name HBr
hydrobromic acid
35
Name HMnO4
permanganic acid
36
Name PbCl4
lead(iv) chloride
37
H2SO3
sulfurous acid
38
Name HC2H3O2
acetic acid
39
Name MgO
magnesium oxide
40
Name NaClO
sodium hypochlorite
41
Name NO2
nitrogen dioxide
42
Write the formula for aluminum oxide
Al2O3
43
Write the formula for chlorous acid
HClO2
44
Write the formula for cupric chloride dihydrate
CuCl• 2H2O
45
Write the formula for chromium(iii) fluoride
CrF3
46
Write the formula for silicon tetrabromide
SiBr4
47
Write the formula for ammonium bromide
NH4Br
48
Write the formula for potassium hydroxide
KOH
49
Write the formula for cobalt(iii) dichromate
Co2(Cr2O7)3
50
Write the formula for calcium phosphate
Ca3(PO4)2
51
Write the formula for carbon dioxide
CO2
52
Write the formula for hydrochloric acid
HCl
53
Write the formula for phosphoric acid
H3PO4
54
Write the formula for silver carbonate
Ag2CO3
55
Write the formula for potassium cyanide
KCN
56
Write the formula for ferric sulfide
Fe2S3
57
Write the formula for phosphorus tribromide
PBr3
58
Write the formula for hydrosulfuric acid
H2S
59
Write the formula for cadmium phosphide
Cd3P2
60
Write the formula for barium perchlorate
Ba(ClO4)2
61
Write the formula for mercury(ii) acetate
Hg(C2H3O2)2
62
Calculate the molar mass of Zn(ClO4)2
264.4 g/mole
63
How many moles in 988g of copper(ii) sulfate
6.19 moles
64
How many molecules in 15.0 grams of chlorine gas
1.27 x 1023 molecules
65
How many grams in 9.03 x 1024 formula units of sodium dichromate
3.93 x 103 g
66
Find the percent composition of C4H6O2, a compound used to make plexiglass
C = 55/8% H = 7.0% O = 37.2%
67
Find the gram-molecular weight of carbon dioxide
44.0 g/mole
68
What is the empirical formula of a compound that is 43.6% phosphorus and 56.4% oxygen
P2O5
69
How many oxygen atoms in 165 grams of potassium dichromate
2.36 x 1024 oxygen atoms
70
How many molecules in 1250 g of water
4.18 x 1025 molecules
71
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
C8H10N4O2
72
How many moles in 358g of ammonium cyanide
8.14 moles
73
Calculate the mass of 3.15 moles of carbonic acid
195 g
74
Calculate the percent water in AlCl3 • 6H2O
44.7% H2O
75
How many formula units in 1.15 kg of aluminum bromide
2.60 x 1024 formula units
76
Determine the empirical formula for a compound that is 42.1% sodium, 18.9% phosphorus, and the rest oxygen
Na3PO4
77
What mass of phosphoric acid contains 5.00 grams of hydrogen
163 grams
78
A hydrate of calcium nitrate is heated and loses 30.5% of its mass. What is the formula of the hydrate
Ca(NO3)2 • 4H2O
79
Calculate the percent composition of magnesium nitrate
Mg = 16.4% N = 18.9% O = 64.7%
80
Give each atom an oxidation number in: KMnO4
K = +1 Mn = +7 O = -2
81
Give each atom an oxidation number in: S2O3-2
S = +2 O = -2
82
Give each atom an oxidation number in: Mg
Mg = 0
83
Give each atom an oxidation number in: Na2CO3
Na = +1 C = +4 O = -2
84
Give each atom an oxidation number in: Fe3(PO4)2
Fe = +2 P = +5 O = -2
85
Give each atom an oxidation number in: Zn(NO3)2
Zn = +2 N = +5 O = -2
86
Give each atom an oxidation number in: O2
O = 0
87
Give each atom an oxidation number in: AsO4-3
As = +5 O = -2
88