Chapter 7 Flashcards by Howsit Goin

What is the oxidation number of hydrogen in MgH₂

-1

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What is the oxidation number of sulfur in S₈

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What is the oxidation number of Cu in Cu₂S

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What is the oxidation number of Cr in Na₂CrO₄

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What is the oxidation number of C in HCO₃^-1

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What is the oxidation number of N in NH₄⁺¹

-3

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What is the oxidation number of Br in HBrO₃

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What is the oxidation number of S in Na₂S₂O₃

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

13 atoms

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

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

NH₃, N₂, N₂O, N₂O₄, NO₃^-1

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What is the number of atoms in 7.46g Li

6.51 x 10²³atoms

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What is the number of molecules in 43.0 g NH₃

1.52 x 10²⁴ molecules

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

2.96 x 10²³formula units

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

6.58 x 10²²ions

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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?

OsO₄

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Find the percent composition of aspirin, C₉H₈O₄

C = 60.0%

H = 4.4%

O = 35.6%

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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?

C₆H₈O₂

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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?

C₅H₁₀O

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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

1.45 x 10²⁶ iron atoms

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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

C, B, D, A

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Name Na₂CrO₄

sodium chromate

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Name AgCl

silver chloride

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Name K₂S₂O₃

potassium thiosulfate

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Name SO₃

sulfur trioxide

Name Fe₂(SO₄)₃

iron(iii) sulfate or ferric sulfate

Name Zn(C₂H₃O₂)₂

zinc acetate

Name HNO₃

nitric acid

Name CaBr₂

calcium bromide

Name H₂CO₃

carbonic acid

Name Na₂O₂

sodium peroxide

Name Ba(OH)₂

barium hydroxide

Name AlCl₃ • 6H₂0

aluminum chloride hexahydrate

Name HBr

hydrobromic acid

Name HMnO₄

permanganic acid

Name PbCl₄

lead(iv) chloride

H₂SO₃

sulfurous acid

Name HC₂H₃O₂

acetic acid

Name MgO

magnesium oxide

Name NaClO

sodium hypochlorite

Name NO₂

nitrogen dioxide

Write the formula for aluminum oxide

Al₂O₃

Write the formula for chlorous acid

HClO₂

Write the formula for cupric chloride dihydrate

CuCl₂• 2H₂O

Write the formula for chromium(iii) fluoride

CrF₃

Write the formula for silicon tetrabromide

SiBr₄

Write the formula for ammonium bromide

NH₄Br

Write the formula for potassium hydroxide

KOH

Write the formula for cobalt(iii) dichromate

Co₂(Cr₂O₇)₃

Write the formula for calcium phosphate

Ca₃(PO₄)₂

Write the formula for carbon dioxide

CO₂

Write the formula for hydrochloric acid

HCl

Write the formula for phosphoric acid

H₃PO₄

Write the formula for silver carbonate

Ag₂CO₃

Write the formula for potassium cyanide

KCN

Write the formula for ferric sulfide

Fe₂S₃

Write the formula for phosphorus tribromide

PBr₃

Write the formula for hydrosulfuric acid

H₂S

Write the formula for cadmium phosphide

Cd₃P₂

Write the formula for barium perchlorate

Ba(ClO₄)₂

Write the formula for mercury(ii) acetate

Hg(C₂H₃O₂)₂

Calculate the molar mass of Zn(ClO₄)₂

264.4 g/mole

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

6.19 moles

How many molecules in 15.0 grams of chlorine gas

1.27 x 10²³ molecules

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

3.93 x 10³ g

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

C = 55/8% H = 7.0% O = 37.2%

Find the gram-molecular weight of carbon dioxide

44.0 g/mole

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

P₂O₅

How many oxygen atoms in 165 grams of potassium dichromate

2.36 x 10²⁴ oxygen atoms

How many molecules in 1250 g of water

4.18 x 10²⁵ molecules

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

How many moles in 358g of ammonium cyanide

8.14 moles

Calculate the mass of 3.15 moles of carbonic acid

195 g

Calculate the percent water in AlCl₃ • 6H₂O

44.7% H₂O

How many formula units in 1.15 kg of aluminum bromide

2.60 x 10²⁴ formula units

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

Na₃PO₄

What mass of phosphoric acid contains 5.00 grams of hydrogen

163 grams

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

Calculate the percent composition of magnesium nitrate

Mg = 16.4% N = 18.9% O = 64.7%

Give each atom an oxidation number in: KMnO₄

K = +1 Mn = +7 O = -2

Give each atom an oxidation number in: S₂O₃^-2

S = +2 O = -2

Give each atom an oxidation number in: Mg

Mg = 0

Give each atom an oxidation number in: Na₂CO₃

Na = +1 C = +4 O = -2

Give each atom an oxidation number in: Fe₃(PO₄)₂

Fe = +2 P = +5 O = -2

Give each atom an oxidation number in: Zn(NO₃)₂

Zn = +2 N = +5 O = -2

Give each atom an oxidation number in: O₂

O = 0

Give each atom an oxidation number in: AsO₄^-3

As = +5 O = -2

Chapter 7 Flashcards

(88 cards)