Question 1

A tiny amount of magnesium chloride contains 150 magnesium ions and 300 chloride ions. The correct formula for magnesium chloride is:

Accepted Answer

A) MgCl 
B) Mg2Cl 
C) MgCl2 
D) Mg150Cl300 
A) MgCl 
B) Mg2Cl 
C) MgCl2 
D) Mg150Cl300

Question 2

How many moles of oxygen gas are needed to react with 9 moles of acetylene, C2H2?
​
2C2H2 + 5O2(g)→ 4CO2 + 2H2O

Accepted Answer

A) 0.4 moles 
B) 4.5 moles 
C) 9 moles 
D) 18 moles 
E) 22.5 moles 
A) 0.4 moles 
B) 4.5 moles 
C) 9 moles 
D) 18 moles 
E) 22.5 moles

Question 3

The correct formula for the nitrate ion is:

Accepted Answer

A) NO −  
B) NO 3−  
C) NO3 −  
D) NO3 2−  
E) none of the above 
A) NO −  
B) NO 3−  
C) NO3 −  
D) NO3 2−  
E) none of the above

Question 4

How many grams of methanol (CH3OH)are produced when 5.00 kg of H2 reacts with excess carbon monoxide?
CO + 2H2 → CH3OH

Accepted Answer

A) 40 g 
B) 80 g 
C) 320 g 
D) 640 g 
E) 40,000 g 
A) 40 g 
B) 80 g 
C) 320 g 
D) 640 g 
E) 40,000 g

Question 5

Using the old English measurements of volume listed, determine the number of gallons in two gills.

Accepted Answer

A) 0.0039 gallons 
B) 64 gallons 
C) 0.0625  gallons 
D) 512 gallons 
E) 2304 gallons 
A) 0.0039 gallons 
B) 64 gallons 
C) 0.0625  gallons 
D) 512 gallons 
E) 2304 gallons

Question 6

How many grams of carbon dioxide are produced when 18.5 moles of oxygen react with excess acetylene, according to the following equation?
​
2C2H2 + 5O2(g)→ 4CO2 + 2H2O

Accepted Answer

A) 2,030 grams 
B) 814 grams 
C) 651 grams 
D) 88.0 grams 
E) 37.0 grams 
A) 2,030 grams 
B) 814 grams 
C) 651 grams 
D) 88.0 grams 
E) 37.0 grams

Question 7

Which of the following does not contain the same number of chlorine atoms as 60 CCl4 molecules?

Accepted Answer

A) 240 HCl molecules 
B) 120 chlorine molecules 
C) 40 SCl6 molecules 
D) 80 CFCl3 molecules 
E) 60 CHCl3 molecules 
A) 240 HCl molecules 
B) 120 chlorine molecules 
C) 40 SCl6 molecules 
D) 80 CFCl3 molecules 
E) 60 CHCl3 molecules

Question 8

How many moles of potassium cyanide are in a 113.5 gram sample of KCN?

Accepted Answer

A) 3.487 moles 
B) 2.903 moles 
C) 1.743 moles 
D) 0.872 moles 
E) 0.0173 moles 
A) 3.487 moles 
B) 2.903 moles 
C) 1.743 moles 
D) 0.872 moles 
E) 0.0173 moles

Question 9

Calculate the number of oxygen atoms in 45.0 g of Co2(SO4)3 (molar mass =405.8 g\mole).

Accepted Answer

A) 8.01 × 1023 atoms 
B) 2.67 × 1023 atoms 
C) 12.0 atoms 
D) 6.68 × 1022 atoms 
E) 1.07 × 1024 atoms 
A) 8.01 × 1023 atoms 
B) 2.67 × 1023 atoms 
C) 12.0 atoms 
D) 6.68 × 1022 atoms 
E) 1.07 × 1024 atoms

Question 10

Which of these substances is a compound?

Accepted Answer

A) Na 
B) Cl2 
C) Pb 
D) NO 
E) H2 
A) Na 
B) Cl2 
C) Pb 
D) NO 
E) H2

Question 11

What is the molecular weight of cholesterol, C27H46O?

Accepted Answer

A) 194 amu 
B) 208 amu 
C) 224 amu 
D) 180 amu 
E) 386 amu 
A) 194 amu 
B) 208 amu 
C) 224 amu 
D) 180 amu 
E) 386 amu

Question 12

Which of these statements about covalent compounds is incorrect ?

Accepted Answer

A) Covalent bonds involve the combination of two nonmetals. 
B) Covalent compounds dissolve in water to form electrolyte solutions. 
C) Covalent compounds contain atoms which share electrons to gain stability. 
D) Molecules are represented by a specific kind of chemical formula . 
E) Electrons in covalent compounds are not always equally shared between atoms. 
A) Covalent bonds involve the combination of two nonmetals. 
B) Covalent compounds dissolve in water to form electrolyte solutions. 
C) Covalent compounds contain atoms which share electrons to gain stability. 
D) Molecules are represented by a specific kind of chemical formula . 
E) Electrons in covalent compounds are not always equally shared between atoms.

Question 13

Nicotine has the chemical formula C10H14N2. What is the molecular weight of nicotine?

Accepted Answer

A) 26 amu 
B) 81 amu 
C) 138 amu 
D) 162 amu 
E) 366 amu 
A) 26 amu 
B) 81 amu 
C) 138 amu 
D) 162 amu 
E) 366 amu

Question 14

Which of these is the correct formula for aluminum oxide?

Accepted Answer

A) Al2O2 
B) Al2O3 
C) AlO 
D) Al3O2 
E) AlO2 
A) Al2O2 
B) Al2O3 
C) AlO 
D) Al3O2 
E) AlO2

Question 15

A tiny crystal of sodium chloride contains 5,000,000 sodium ions and 5,000,000 chloride ions. The correct formula for sodium chloride is:

Accepted Answer

A) NaCl 
B) Na5Cl5 
C) Na50Cl50 
D) It could be any of the above. 
E) None of the above 
A) NaCl 
B) Na5Cl5 
C) Na50Cl50 
D) It could be any of the above. 
E) None of the above

Question 16

Which of these is not a covalent compound?

Accepted Answer

A) SiO2 
B) CH4 
C) N2O 
D) CaO 
E) ICl3 
A) SiO2 
B) CH4 
C) N2O 
D) CaO 
E) ICl3

Question 17

How many moles of oxygen gas will react with 6.2 moles of aluminum?
4Al(s)+ 3O2(g)→ 2Al2O3(s)

Accepted Answer

A) 0.12 moles 
B) 1.55 moles 
C) 2.4 moles 
D) 4.65 moles 
E) 8.27 moles 
A) 0.12 moles 
B) 1.55 moles 
C) 2.4 moles 
D) 4.65 moles 
E) 8.27 moles

Question 18

How many grams are in 2.35 moles of calcium carbonate, CaCO3?

Accepted Answer

A) 0.01175 grams 
B) 0.0235 grams 
C) 0.0588 grams 
D) 107 grams 
E) 235 grams 
A) 0.01175 grams 
B) 0.0235 grams 
C) 0.0588 grams 
D) 107 grams 
E) 235 grams

A tiny amount of magnesium chloride contains 150 magnesium ions and 300 chloride ions. The correct formula for magnesium chloride is:

How many moles of oxygen gas are needed to react with 9 moles of acetylene, C₂H₂? 2C₂H₂ + 5O₂(g)→ 4CO₂ + 2H₂O

The correct formula for the nitrate ion is:

How many grams of methanol (CH₃OH)are produced when 5.00 kg of H₂ reacts with excess carbon monoxide? CO + 2H₂ → CH₃OH

Using the old English measurements of volume listed, determine the number of gallons in two gills.

How many grams of carbon dioxide are produced when 18.5 moles of oxygen react with excess acetylene, according to the following equation? 2C₂H₂ + 5O₂(g)→ 4CO₂ + 2H₂O

Which of the following does not contain the same number of chlorine atoms as 60 CCl₄ molecules?

How many moles of potassium cyanide are in a 113.5 gram sample of KCN?

Calculate the number of oxygen atoms in 45.0 g of Co₂(SO₄)₃ (molar mass =405.8 g\mole).

Which of these substances is a compound?

What is the molecular weight of cholesterol, C₂₇H₄₆O?

Which of these statements about covalent compounds is incorrect ?

Nicotine has the chemical formula C₁₀H₁₄N₂. What is the molecular weight of nicotine?

Which of these is the correct formula for aluminum oxide?

A tiny crystal of sodium chloride contains 5,000,000 sodium ions and 5,000,000 chloride ions. The correct formula for sodium chloride is:

Which of these is not a covalent compound?

How many moles of oxygen gas will react with 6.2 moles of aluminum? 4Al(s)+ 3O₂(g)→ 2Al₂O₃(s)

How many grams are in 2.35 moles of calcium carbonate, CaCO₃?

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Exam 4: Molecules, Compounds, and Chemical Reactions

A tiny amount of magnesium chloride contains 150 magnesium ions and 300 chloride ions. The correct formula for magnesium chloride is:

How many moles of oxygen gas are needed to react with 9 moles of acetylene, C2H2? ​ 2C2H2 + 5O2(g)→ 4CO2 + 2H2O

The correct formula for the nitrate ion is:

How many grams of methanol (CH3OH)are produced when 5.00 kg of H2 reacts with excess carbon monoxide? CO + 2H2 → CH3OH

Using the old English measurements of volume listed, determine the number of gallons in two gills.

How many grams of carbon dioxide are produced when 18.5 moles of oxygen react with excess acetylene, according to the following equation? ​ 2C2H2 + 5O2(g)→ 4CO2 + 2H2O

Which of the following does not contain the same number of chlorine atoms as 60 CCl4 molecules?

How many moles of potassium cyanide are in a 113.5 gram sample of KCN?

Calculate the number of oxygen atoms in 45.0 g of Co2(SO4)3 (molar mass =405.8 g\mole).

Which of these substances is a compound?

What is the molecular weight of cholesterol, C27H46O?

Which of these statements about covalent compounds is incorrect ?

Nicotine has the chemical formula C10H14N2. What is the molecular weight of nicotine?

Which of these is the correct formula for aluminum oxide?

A tiny crystal of sodium chloride contains 5,000,000 sodium ions and 5,000,000 chloride ions. The correct formula for sodium chloride is:

Which of these is not a covalent compound?

How many moles of oxygen gas will react with 6.2 moles of aluminum? 4Al(s)+ 3O2(g)→ 2Al2O3(s)

How many grams are in 2.35 moles of calcium carbonate, CaCO3?

Molecular Reasons

The Chemists Toolbox

Atoms and Elements

Chemical Bonding

Organic Chemistry

Light and Color

Nuclear Chemistry

Energy for Today

Energy for Tomorrow: Solar and Other Renewable Energy Sources

The Air Around Us

The Liquids and Solids Around Us: Especially Water

Acids and Bases: the Molecules Responsible for Sour and Bitter

Oxidation and Reduction

The Chemistry of Household Products

Biochemistry and Biotechnology

Drugs and Medicine: Healing, Helping, and Hurting

The Chemistry of Food

Nanotechnology

Filters

How many moles of oxygen gas are needed to react with 9 moles of acetylene, C₂H₂? 2C₂H₂ + 5O₂(g)→ 4CO₂ + 2H₂O

How many grams of methanol (CH₃OH)are produced when 5.00 kg of H₂ reacts with excess carbon monoxide? CO + 2H₂ → CH₃OH

How many grams of carbon dioxide are produced when 18.5 moles of oxygen react with excess acetylene, according to the following equation? 2C₂H₂ + 5O₂(g)→ 4CO₂ + 2H₂O

Which of the following does not contain the same number of chlorine atoms as 60 CCl₄ molecules?

Calculate the number of oxygen atoms in 45.0 g of Co₂(SO₄)₃ (molar mass =405.8 g\mole).

What is the molecular weight of cholesterol, C₂₇H₄₆O?

Nicotine has the chemical formula C₁₀H₁₄N₂. What is the molecular weight of nicotine?

How many moles of oxygen gas will react with 6.2 moles of aluminum? 4Al(s)+ 3O₂(g)→ 2Al₂O₃(s)

How many grams are in 2.35 moles of calcium carbonate, CaCO₃?