Worked Chemistry Problems
Use these worked examples problems to help solve related problems in your own chemistry homework or to better grasp chemical concepts. These are general & introductory chemistry problems, with links to related resources.
Index of Worked Chemistry Problems
This is a one-page index of all of the worked chemistry problems on the site, arranged alphabetically and also arranged according to the order in which they are (typically) presented in a general chemistry text.
This is a one-page index of all of the worked chemistry problems on the site, arranged alphabetically and also arranged according to the order in which they are (typically) presented in a general chemistry text.
Printable Chemistry Worksheets
This is a collection of chemistry worksheets in pdf format. The answers to the questions are available on separate worksheets so you can fill them out and then check your work.
This is a collection of chemistry worksheets in pdf format. The answers to the questions are available on separate worksheets so you can fill them out and then check your work.
Unit Conversion Worksheets
Use these printable worksheets to practice unit conversions. These pdf questions and answers will test your understanding of metric-metric, metric-English, and temperature conversions.
Use these printable worksheets to practice unit conversions. These pdf questions and answers will test your understanding of metric-metric, metric-English, and temperature conversions.
Angle Between Two Vectors and Vector Scalar Product
This is a worked example problem that shows how to find the angle between two vectors.
This is a worked example problem that shows how to find the angle between two vectors.
Avogadro's Number Example Chemistry Problem
Avogadro's number is the number of atoms or molecules in a mole. Here is an example of using this number to determine the mass of a single atom based on the atomic mass of that atom.
Avogadro's number is the number of atoms or molecules in a mole. Here is an example of using this number to determine the mass of a single atom based on the atomic mass of that atom.
Avogadro's Number Example Chemistry Problem
Avogadro's number is the number of atoms or molecules in a mole. Here is an example of using this number to determine the mass of a known number of molecules.
Avogadro's number is the number of atoms or molecules in a mole. Here is an example of using this number to determine the mass of a known number of molecules.
Avogadro's Number Example Chemistry Problem
Avogadro's number is the number of atoms or molecules in a mole. Here is an example of using this number to determine the number of molecules contained in a known mass of molecules.
Avogadro's number is the number of atoms or molecules in a mole. Here is an example of using this number to determine the number of molecules contained in a known mass of molecules.
Atomic Mass and Atomic Abundance Example Chemistry Problem
Atomic mass is determined by the weighted average of the masses of naturally-occurring isotopes. Here is an example of how to determine the atomic abundance.
Atomic mass is determined by the weighted average of the masses of naturally-occurring isotopes. Here is an example of how to determine the atomic abundance.
Atomic Mass from Atomic Abundance Example Chemistry Problem
Atomic mass is determined by the weighted average of the masses of naturally-occurring isotopes. Here is an example of how to determine the atomic mass from known atomic abundances.
Atomic mass is determined by the weighted average of the masses of naturally-occurring isotopes. Here is an example of how to determine the atomic mass from known atomic abundances.
Acids and Bases - Titration Example Problem
Here is an acids and bases example problem involving titration. A base of known concentration is used to neutralize an unknown concentration of an acid.
Here is an acids and bases example problem involving titration. A base of known concentration is used to neutralize an unknown concentration of an acid.
Acids and Bases - Calculating pH
Here is an example of an acid/base problem to calculate the pH of an aqueous solution where the concentration of H[sup]+[/sup] is known.
Here is an example of an acid/base problem to calculate the pH of an aqueous solution where the concentration of H[sup]+[/sup] is known.
Acids and Bases - Calculating pH of a Strong Acid
Here is an example of an acid/base problem to calculate the pH of a strong acid.
Here is an example of an acid/base problem to calculate the pH of a strong acid.
Acids and Bases - Calculating pH of a Strong Base
Here is an example of an acid/base problem to calculate the pH of a strong base.
Here is an example of an acid/base problem to calculate the pH of a strong base.
Acids and Bases - Calculating pH of a Weak Acid
Here is an example of an acid/base problem to calculate the pH of a weak acid solution of known concentration.
Here is an example of an acid/base problem to calculate the pH of a weak acid solution of known concentration.
Acids and Bases - Neutralizing an Acid with a Base
This example demonstrates the method used to calculate the amount of an acid of known concentration needed to neutralize a base of known concentration.
This example demonstrates the method used to calculate the amount of an acid of known concentration needed to neutralize a base of known concentration.
Aqueous Solution Dilution
Here is a worked example of how to calculate a dilution of a stock solution.
Here is a worked example of how to calculate a dilution of a stock solution.
Atomic Mass & Isotopic Abundance
These are examples of atomic mass and isotopic abundance calculations, with links to other worked chemistry problems and homework help.
These are examples of atomic mass and isotopic abundance calculations, with links to other worked chemistry problems and homework help.
Avogadro's Number
These are examples of calculations involving Avogradro's number, with links to other worked chemistry problems and homework help.
These are examples of calculations involving Avogradro's number, with links to other worked chemistry problems and homework help.
Balancing Chemical Equations
Here is a step-by-step tutorial for balancing chemical equations, along with a worked example. This is a must-read for students of general and introductory chemistry!
Here is a step-by-step tutorial for balancing chemical equations, along with a worked example. This is a must-read for students of general and introductory chemistry!
Balancing Redox Reactions
Get step-by-step instructions for balancing redox reactions for conservation of mass and charge in electrochemistry.
Get step-by-step instructions for balancing redox reactions for conservation of mass and charge in electrochemistry.
Bond Energies & Enthalpies
This is a step-by-step worked problem to help you calculate bond energies and enthalpies for gaseous reactions.
This is a step-by-step worked problem to help you calculate bond energies and enthalpies for gaseous reactions.
Bond Energies and Enthalpy Change Example Chemistry Problem
Bond energies and enthalpy can be used to determine if a reaction is endothermic or exothermic. Here is an example showing how to determine the change in enthalpy of a reaction.
Bond energies and enthalpy can be used to determine if a reaction is endothermic or exothermic. Here is an example showing how to determine the change in enthalpy of a reaction.
Boyle's Law
Here's an introduction to Boyle's Law, as well as a worked example problem and links to related resources.
Here's an introduction to Boyle's Law, as well as a worked example problem and links to related resources.
Calorimetry and Heat Flow
There's a worked example for coffee cup calorimetry and another for bomb calorimetry, with links to review calorimetry and thermochemistry concepts.
There's a worked example for coffee cup calorimetry and another for bomb calorimetry, with links to review calorimetry and thermochemistry concepts.
Carbon 14 Dating
Here's a worked example of the calculation for carbon 14 dating of organic material. The same principle can be applied to other isotopic ratios used to estimate age.
Here's a worked example of the calculation for carbon 14 dating of organic material. The same principle can be applied to other isotopic ratios used to estimate age.
Celsius to Kelvin Temperature Conversion
Here is an example problem that explains how to convert a temperature from degrees on the Celsius scale to Kelvin.
Here is an example problem that explains how to convert a temperature from degrees on the Celsius scale to Kelvin.
Concentration and Molarity
These are examples of concentration and molarity calculations, with links to other worked chemistry problems and homework help.
These are examples of concentration and molarity calculations, with links to other worked chemistry problems and homework help.
Concentration and Molarity Worked Example Problem
This is a worked example showing the steps necessary to find the concentration of a solution when given the amount of solute.
This is a worked example showing the steps necessary to find the concentration of a solution when given the amount of solute.
Concentration and Molarity Worked Example Problem
This is a worked example of how to determine the concentration of individual ions in an aqueous solution from the total concentration.
This is a worked example of how to determine the concentration of individual ions in an aqueous solution from the total concentration.
Concentration and Molarity Worked Example Problem
This is a worked example showing the steps necessary to create a stock solution of predetermined concentration.
This is a worked example showing the steps necessary to create a stock solution of predetermined concentration.
Empirical Formula
Learn how to find the empirical formula from percent composition data.
Learn how to find the empirical formula from percent composition data.
Enthalpy Change Example Problem
Worked Example Chemistry Problems - Determining change in enthalpy of a reaction using Hess's Laws.
Worked Example Chemistry Problems - Determining change in enthalpy of a reaction using Hess's Laws.
Enthalpy Change Example Problem
Worked Example Chemistry Problems - Determining change in enthalpy of a reaction using Hess's Laws.
Worked Example Chemistry Problems - Determining change in enthalpy of a reaction using Hess's Laws.
Enthalpy Change Example Problem
Worked Example Chemistry Problems - Determining change in enthalpy of melting ice and vaporizing water. Additional worked problem to determine mass of ice melted from given energy value.
Worked Example Chemistry Problems - Determining change in enthalpy of melting ice and vaporizing water. Additional worked problem to determine mass of ice melted from given energy value.
Gram to Mole Conversions
Here are worked examples problems for mole to gram or gram to mole conversions.
Here are worked examples problems for mole to gram or gram to mole conversions.
Heats of Formation
These are examples of how to calculate the heats of formation for compounds and ions in aqueous solution. Links are given to rules of thermochemistry and explanations of endothermic and exothermic reactions.
These are examples of how to calculate the heats of formation for compounds and ions in aqueous solution. Links are given to rules of thermochemistry and explanations of endothermic and exothermic reactions.
Henderson Hasselbalch Equation and Example
You can calculate the pH of a buffer solution or the concentration of the acid and base using the Henderson Hasselbalch equation. Here's a look at the Henderson Hasselbalch equation and a worked example that explains how to apply the equation.
You can calculate the pH of a buffer solution or the concentration of the acid and base using the Henderson Hasselbalch equation. Here's a look at the Henderson Hasselbalch equation and a worked example that explains how to apply the equation.
Ideal Gas Law
Here are some worked examples of Ideal Gas Law chemistry problems plus links to formulas for working gas problems and related chemistry tools and resources.
Here are some worked examples of Ideal Gas Law chemistry problems plus links to formulas for working gas problems and related chemistry tools and resources.
Ideal Gas Example Problem - Constant Pressure
Here is an example of an ideal gas problem where the pressure of the gas is held constant.
Here is an example of an ideal gas problem where the pressure of the gas is held constant.
Ideal Gas Example - Constant Temperature
Here is an example of an ideal gas problem where the temperature of the gas is held constant.
Here is an example of an ideal gas problem where the temperature of the gas is held constant.
Ideal Gas Example Problem - Constant Volume
Here is an example of an ideal gas problem where the volume of the gas is held constant.
Here is an example of an ideal gas problem where the volume of the gas is held constant.
Ideal Gas Problem - Number of Moles
This example uses the ideal gas law to determine the number of moles of an ideal gas present in a system where pressure, volume and temperature are known.
This example uses the ideal gas law to determine the number of moles of an ideal gas present in a system where pressure, volume and temperature are known.
Ideal Gas Example Problem - Partial Pressure
This is an example demonstrating how to determine the partial pressure of a gas in a mixed system of gases.
This is an example demonstrating how to determine the partial pressure of a gas in a mixed system of gases.
Ideal Gas Example Problem - Unknown gas
This is an example of a problem where element or compound is unknown, but the mass and gas properties pressure, volume and temperature are known.
This is an example of a problem where element or compound is unknown, but the mass and gas properties pressure, volume and temperature are known.
Isotopes and Nuclear Symbols
These are examples of isotope and nuclear symbol problems, with links to other worked chemistry problems and homework help.
These are examples of isotope and nuclear symbol problems, with links to other worked chemistry problems and homework help.
Law of Multiple Proportions
Here's an example of a Law of Multiple Proportion problem, with links to other worked chemistry problems and homework help.
Here's an example of a Law of Multiple Proportion problem, with links to other worked chemistry problems and homework help.
Limiting Reactant and Theoretical Yield
These are examples of calculations for determining the limiting reactant and theoretical yield of a reaction, with links to other worked chemistry problems and homework help.
These are examples of calculations for determining the limiting reactant and theoretical yield of a reaction, with links to other worked chemistry problems and homework help.
Mass Percent Composition
These are examples of mass percent composition calculations, with links to other worked chemistry problems and homework help.
These are examples of mass percent composition calculations, with links to other worked chemistry problems and homework help.
Mass Percent Composition Problem #2
This is worked example problem showing how to calculate mass percent composition.
This is worked example problem showing how to calculate mass percent composition.
Mass Relations in Balanced Equations
These are examples of calculations for determining the mass relations in balanced chemical equations, with links to other worked chemistry problems and homework help.
These are examples of calculations for determining the mass relations in balanced chemical equations, with links to other worked chemistry problems and homework help.
Mean or Average - Calculate the Mean
It's very important to know how to calculate the mean or average of a set of numbers. Among other things, this will allow you to calculate your grade point average. However, you'll need to calculate the mean for several other situations, too.
It's very important to know how to calculate the mean or average of a set of numbers. Among other things, this will allow you to calculate your grade point average. However, you'll need to calculate the mean for several other situations, too.
Molar Mass Example
You can calculate the molar mass or mass of one mole of an element or molecule if you know the formula for the substance and have a periodic table or table of atomic masses. Here are worked examples of molar mass calculations.
You can calculate the molar mass or mass of one mole of an element or molecule if you know the formula for the substance and have a periodic table or table of atomic masses. Here are worked examples of molar mass calculations.
Molality Example Problem
Here is an example of calculating concentration or molality of a solution.
Here is an example of calculating concentration or molality of a solution.
Molarity Example Problem
Here is an example of calculating concentration or molarity of a solution.
Here is an example of calculating concentration or molarity of a solution.
Mole - Gram Conversions
These are examples of mole-to-gram and gram-to-mole conversions, with links to other worked chemistry problems and homework help.
These are examples of mole-to-gram and gram-to-mole conversions, with links to other worked chemistry problems and homework help.
Mole Relations in Balanced Equations
These are examples of calculations for determining the mole relations in balanced chemical equations, with links to other worked chemistry problems and homework help.
These are examples of calculations for determining the mole relations in balanced chemical equations, with links to other worked chemistry problems and homework help.
Molecular Formula from Simplest Formula
These are examples of calculations for determining the molecular formula from the simplest formula and approximate molecular mass, with links to other worked chemistry problems and homework help.
These are examples of calculations for determining the molecular formula from the simplest formula and approximate molecular mass, with links to other worked chemistry problems and homework help.
Molecular Mass Calculations
These are examples of molecular mass calculations, with links to other worked chemistry problems and homework help.
These are examples of molecular mass calculations, with links to other worked chemistry problems and homework help.
Molecular Mass from Molecular Formula
Use these worked example chemistry problems to help practice calculating molecular mass from the molecular formula.
Use these worked example chemistry problems to help practice calculating molecular mass from the molecular formula.
Normality Calculation
The normality of a solution is the gram equivalent weight of a solute per liter of solution. Here's an example of how to calculate the normality of a solution.
The normality of a solution is the gram equivalent weight of a solute per liter of solution. Here's an example of how to calculate the normality of a solution.
Nuclear Reactions - Mass - Energy Relations
Learn how to calculate the energy change in a nuclear reaction, such as radioactive decay.
Learn how to calculate the energy change in a nuclear reaction, such as radioactive decay.
Paramagnetism and Diamagnetism Worked Problem
Here is a worked example problem showing how to tell whether an element is paramagnetic or diamagnetic based on its electron configuration.
Here is a worked example problem showing how to tell whether an element is paramagnetic or diamagnetic based on its electron configuration.
Percent Composition by Mass
Here is an example of calculating concentration using percent composition by mass of a solution.
Here is an example of calculating concentration using percent composition by mass of a solution.
Predicting Formulas of Compounds with Polyatomic Ions
This is a tutorial for problems determining the formulas of compounds containing polyatomic ions. Links are included to the periodic table, a chart of common polyatomic ions, group chemistry, and valences of the elements.
This is a tutorial for problems determining the formulas of compounds containing polyatomic ions. Links are included to the periodic table, a chart of common polyatomic ions, group chemistry, and valences of the elements.
Predicting Formulas of Ionic Compounds
This is a tutorial for working through problems asking you to determine the formulas of ionic compounds. Links are included to the periodic table, group chemistry, and valences of the elements.
This is a tutorial for working through problems asking you to determine the formulas of ionic compounds. Links are included to the periodic table, group chemistry, and valences of the elements.
Pressure Conversions
Here are some examples of conversions between units of pressure (kPa, atm, mm Hg).
Here are some examples of conversions between units of pressure (kPa, atm, mm Hg).
Pressure Unit Conversion Problem
This is a worked example problem converting units of pressure.
This is a worked example problem converting units of pressure.
Protons & Electrons in Ions
These are examples of calculations used to determine the number of protons and electrons in ions, with links to other worked chemistry problems and homework help.
These are examples of calculations used to determine the number of protons and electrons in ions, with links to other worked chemistry problems and homework help.
Rate of Radioactive Decay
Work through an example chemistry problem on the rate of radioactive decay, a type of first order rate reaction.
Work through an example chemistry problem on the rate of radioactive decay, a type of first order rate reaction.
Reactions in Aqueous Solution
These are examples of calculations for determining limiting reactant, theoretical yield, number of moles, and mass in grams for reactions in water solutions.
These are examples of calculations for determining limiting reactant, theoretical yield, number of moles, and mass in grams for reactions in water solutions.
Significant Figures Problem
This is a worked example problem illustrating how to determine significant figures.
This is a worked example problem illustrating how to determine significant figures.
Simplest Formula from Percent Composition
These are examples of calculations for determining the simplest formula of a compound from its percent composition, with links to other worked chemistry problems and homework help.
These are examples of calculations for determining the simplest formula of a compound from its percent composition, with links to other worked chemistry problems and homework help.
Temperature Conversions
These are examples of temperature conversion problems, with links to other worked chemistry problems and homework help.
These are examples of temperature conversion problems, with links to other worked chemistry problems and homework help.
Temperature Unit Conversion Problem
This is a worked conversion problem showing how to convert from Kelvin to degrees Celsius and Fahrenheit.
This is a worked conversion problem showing how to convert from Kelvin to degrees Celsius and Fahrenheit.
Uncertainty Sample Calculation
This is a worked example problem that shows how to determine uncertainty in measurements. Uncertainty is related to precision and significant figures.
This is a worked example problem that shows how to determine uncertainty in measurements. Uncertainty is related to precision and significant figures.
Unit Conversions
These are examples of unit conversion problems, with links to other worked chemistry problems and homework help.
These are examples of unit conversion problems, with links to other worked chemistry problems and homework help.