Question 1

What is the chemical formula for magnesium hydride?

Accepted Answer

A) MgH2 
B) MgOH 
C) MgOH2 
D) Mg(OH)2 
A) MgH2 
B) MgOH 
C) MgOH2 
D) Mg(OH)2 A

Question 2

What mass of carbon dioxide,CO2,contains the same number of molecules as 3.00 g of trichlorofluoromethane,CCl3F?

Accepted Answer

A) 0.106 g 
B) 0.961 g 
C) 1.04 g 
D) 9.37 g 
A) 0.106 g 
B) 0.961 g 
C) 1.04 g 
D) 9.37 g B

Question 3

Calculate the molar mass for Mg(ClO4)2.

Accepted Answer

A) 223.21 g/mol 
B) 123.76 g/mol 
C) 119.52 g/mol 
D) 247.52 g/mol 
E) 75.76 g/mol 
A) 223.21 g/mol 
B) 123.76 g/mol 
C) 119.52 g/mol 
D) 247.52 g/mol 
E) 75.76 g/mol A

Question 4

Determine the molecular formula of a compound that has a molar mass of 183.2 g/mol and an empirical formula of C2H5O2.

Accepted Answer

A) C2H5O2 
B) C6H15O6 
C) C3H7O3 
D) C4H10O4 
E) C8H20O8 
A) C2H5O2 
B) C6H15O6 
C) C3H7O3 
D) C4H10O4 
E) C8H20O8

Question 5

Give the formula for sulfurous acid.

Accepted Answer

A) H2SO3 
B) HSO3 
C) H2SO4 
D) HSO4 
A) H2SO3 
B) HSO3 
C) H2SO4 
D) HSO4

Question 6

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 50.00 gram sample of the alcohol produced 95.50 grams of CO2 and 58.70 grams of H2O.What is the empirical formula of the alcohol?

Accepted Answer

Question 7

Which one of the following contains 39% carbon by mass?

Accepted Answer

A) C2H2 
B) CH4 
C) CH3NH2 
D) CO2 
A) C2H2 
B) CH4 
C) CH3NH2 
D) CO2

Question 8

Which of the following is a molecular compound?

Accepted Answer

A) CuCl2 
B) KCl 
C) NaNO3 
D) CH3Cl 
E) RbBr 
A) CuCl2 
B) KCl 
C) NaNO3 
D) CH3Cl 
E) RbBr

Question 9

Match the following.
-iodine

Accepted Answer

A) I(s) 
B) Cl(g) 
C) O(g) 
D) Cl2(g) 
E) Ne2(g)
F)Ne(g)
G)Ca(s)
H)Q2(g)
I)I2(s)
J)Ca2(s) 
A) I(s) 
B) Cl(g) 
C) O(g) 
D) Cl2(g) 
E) Ne2(g)
F)Ne(g)
G)Ca(s)
H)Q2(g)
I)I2(s)
J)Ca2(s)

Question 10

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest,whole-number coefficients?
_____ C2H6O(l)+ _____ O2(g)→ _____ CO2(g)+ _____ H2O(l)

Accepted Answer

A) 9 
B) 7 
C) 5 
D) 3 
A) 9 
B) 7 
C) 5 
D) 3

Question 11

Two samples of potassium iodide are decomposed into their constituent elements.The first sample produced 13.0 g of potassium and 42.3 g of iodine.If the second sample produced 24.4 kg of potassium,how many kg of iodine were produced?

Accepted Answer

A) 13.3 kg 
B) 22.5 kg 
C) 79.4 kg 
D) 44.4 kg 
E) 92.4 kg 
A) 13.3 kg 
B) 22.5 kg 
C) 79.4 kg 
D) 44.4 kg 
E) 92.4 kg

Question 12

What is the molar mass of 1-butene if 5.38 × 1016 molecules of 1-butene weigh 5.00 μg?

Accepted Answer

A) 56.0 g/mol 
B) 178 g/mol 
C) 224 g/mol 
D) 447 g/mol 
A) 56.0 g/mol 
B) 178 g/mol 
C) 224 g/mol 
D) 447 g/mol

Question 13

What is the empirical formula of a substance that contains 2.64 g of C,0.444 g of H,and 3.52 g of O?

Accepted Answer

A) C H2O  
B) C2H4O2 
C) C2H4O3 
D) C3H4O4 
A) C H2O  
B) C2H4O2 
C) C2H4O3 
D) C3H4O4

Question 14

Balance the following equation.
____ C10H12 + ____ O2 → ____ H2O + ____ CO2

Accepted Answer

1 C₁₀H₁₂ + 13

Question 15

Match the following.
-calcium

Accepted Answer

A) I(s) 
B) Cl(g) 
C) O(g) 
D) Cl2(g) 
E) Ne2(g)
F)Ne(g)
G)Ca(s)
H)Q2(g)
I)I2(s)
J)Ca2(s) 
A) I(s) 
B) Cl(g) 
C) O(g) 
D) Cl2(g) 
E) Ne2(g)
F)Ne(g)
G)Ca(s)
H)Q2(g)
I)I2(s)
J)Ca2(s)

Question 16

Methane and oxygen react to form carbon dioxide and water.What mass of water is formed if 0.80 g of methane reacts with 3.2 g of oxygen to produce 2.2 g of carbon dioxide?

Accepted Answer

A) 1.8 g 
B) 2.2 g 
C) 3.7 g 
D) 4.0 g 
A) 1.8 g 
B) 2.2 g 
C) 3.7 g 
D) 4.0 g

Question 17

Which of the following is a molecular element?

Accepted Answer

A) neon 
B) lithium 
C) selenium 
D) magnesium 
E) titanium 
A) neon 
B) lithium 
C) selenium 
D) magnesium 
E) titanium

Question 18

How many sodium ions are contained in 99.6 mg of Na2SO3? 
The molar mass of Na2SO3 is 126.05 g/mol.

Accepted Answer

A) 1.52 × 1027 sodium ions 
B) 4.76 × 1020 sodium ions 
C) 2.10 × 1021 sodium ions 
D) 1.05 × 1021 sodium ions 
E) 9.52 × 1020 sodium ions 
A) 1.52 × 1027 sodium ions 
B) 4.76 × 1020 sodium ions 
C) 2.10 × 1021 sodium ions 
D) 1.05 × 1021 sodium ions 
E) 9.52 × 1020 sodium ions

Question 19

The chemical formula for nitrous acid is

Accepted Answer

A) H3N(aq). 
B) H NO2(aq). 
C) H NO3(aq). 
D) H2N2O6(aq). 
A) H3N(aq). 
B) H NO2(aq). 
C) H NO3(aq). 
D) H2N2O6(aq).

Question 20

How many Fe(II)ions are there in 20.0 g of FeSO4?

Accepted Answer

A) 2.19 × 10-25 iron(II)ions 
B) 7.92 × 1022 iron(II)ions 
C) 4.57 × 1024 iron(II)ions 
D) 1.82 × 1027 iron(II)ions 
A) 2.19 × 10-25 iron(II)ions 
B) 7.92 × 1022 iron(II)ions 
C) 4.57 × 1024 iron(II)ions 
D) 1.82 × 1027 iron(II)ions

What is the chemical formula for magnesium hydride?

What mass of carbon dioxide,CO₂,contains the same number of molecules as 3.00 g of trichlorofluoromethane,CCl₃F?

Calculate the molar mass for Mg(ClO₄)₂.

Determine the molecular formula of a compound that has a molar mass of 183.2 g/mol and an empirical formula of C₂H₅O₂.

Give the formula for sulfurous acid.

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 50.00 gram sample of the alcohol produced 95.50 grams of CO₂ and 58.70 grams of H₂O.What is the empirical formula of the alcohol?

Which one of the following contains 39% carbon by mass?

Which of the following is a molecular compound?

Match the following. -iodine

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest,whole-number coefficients? ___ C₂H₆O(l)+ _ O₂(g)→ _ CO₂(g)+ ___ H₂O(l)

Two samples of potassium iodide are decomposed into their constituent elements.The first sample produced 13.0 g of potassium and 42.3 g of iodine.If the second sample produced 24.4 kg of potassium,how many kg of iodine were produced?

What is the molar mass of 1-butene if 5.38 × 10¹⁶ molecules of 1-butene weigh 5.00 μg?

What is the empirical formula of a substance that contains 2.64 g of C,0.444 g of H,and 3.52 g of O?

Balance the following equation. C₁₀H₁₂ + O₂_→ H₂O + CO₂

Match the following. -calcium

Methane and oxygen react to form carbon dioxide and water.What mass of water is formed if 0.80 g of methane reacts with 3.2 g of oxygen to produce 2.2 g of carbon dioxide?

Which of the following is a molecular element?

How many sodium ions are contained in 99.6 mg of Na₂SO₃? The molar mass of Na₂SO₃is 126.05 g/mol.

The chemical formula for nitrous acid is

How many Fe(II)ions are there in 20.0 g of FeSO₄?

Matter, Measurement, and Problem Solving

Atoms and Elements

Chemical Quantities and Aqueous Reactions

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Filters

Exam 3: Molecules, Compounds and Chemical Equations

What is the chemical formula for magnesium hydride?

What mass of carbon dioxide,CO2,contains the same number of molecules as 3.00 g of trichlorofluoromethane,CCl3F?

Calculate the molar mass for Mg(ClO4)2.

Determine the molecular formula of a compound that has a molar mass of 183.2 g/mol and an empirical formula of C2H5O2.

Give the formula for sulfurous acid.

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 50.00 gram sample of the alcohol produced 95.50 grams of CO2 and 58.70 grams of H2O.What is the empirical formula of the alcohol?

Which one of the following contains 39% carbon by mass?

Which of the following is a molecular compound?

Match the following. -iodine

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest,whole-number coefficients? _____ C2H6O(l)+ _____ O2(g)→ _____ CO2(g)+ _____ H2O(l)

Two samples of potassium iodide are decomposed into their constituent elements.The first sample produced 13.0 g of potassium and 42.3 g of iodine.If the second sample produced 24.4 kg of potassium,how many kg of iodine were produced?

What is the molar mass of 1-butene if 5.38 × 1016 molecules of 1-butene weigh 5.00 μg?

What is the empirical formula of a substance that contains 2.64 g of C,0.444 g of H,and 3.52 g of O?

Balance the following equation. ____ C10H12 + ____ O2 → ____ H2O + ____ CO2

Match the following. -calcium

Methane and oxygen react to form carbon dioxide and water.What mass of water is formed if 0.80 g of methane reacts with 3.2 g of oxygen to produce 2.2 g of carbon dioxide?

Which of the following is a molecular element?

How many sodium ions are contained in 99.6 mg of Na2SO3? The molar mass of Na2SO3 is 126.05 g/mol.

The chemical formula for nitrous acid is

How many Fe(II)ions are there in 20.0 g of FeSO4?

Matter, Measurement, and Problem Solving

Atoms and Elements

Chemical Quantities and Aqueous Reactions

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Filters

What mass of carbon dioxide,CO₂,contains the same number of molecules as 3.00 g of trichlorofluoromethane,CCl₃F?

Calculate the molar mass for Mg(ClO₄)₂.

Determine the molecular formula of a compound that has a molar mass of 183.2 g/mol and an empirical formula of C₂H₅O₂.

A certain alcohol contains only three elements,carbon,hydrogen,and oxygen.Combustion of a 50.00 gram sample of the alcohol produced 95.50 grams of CO₂ and 58.70 grams of H₂O.What is the empirical formula of the alcohol?

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest,whole-number coefficients? ___ C₂H₆O(l)+ _ O₂(g)→ _ CO₂(g)+ ___ H₂O(l)

What is the molar mass of 1-butene if 5.38 × 10¹⁶ molecules of 1-butene weigh 5.00 μg?

Balance the following equation. C₁₀H₁₂ + O₂_→ H₂O + CO₂

How many sodium ions are contained in 99.6 mg of Na₂SO₃? The molar mass of Na₂SO₃is 126.05 g/mol.

How many Fe(II)ions are there in 20.0 g of FeSO₄?