Use chemistry problems as a tool for mastering chemistry concepts. Some of these examples show using formulas while others include lists of examples.

### Acids, Bases, and pH Chemistry Problems

Learn about acids and bases. See how to calculate pH, pOH, K_{a}, K_{b}, pK_{a}, and pK_{b}.

- Practice calculating pH.
- Get example pH, pK
_{a}, pK_{b}, K_{a}, and K_{b}calculations. - Get examples of amphoterism.

### Atomic Structure Problems

Learn about atomic mass, the Bohr model, and the part of the atom.

- Practice identifying atomic number, mass number, and atomic mass.
- Get examples showing ways to find atomic mass.
- Use Avogadro’s number and find the mass of a single atom.
- Review the Bohr model of the atom.
- Find the number of valence electrons of an element’s atom.

### Chemical Bonds

Learn how to use electronegativity to determine whether atoms form ionic or covalent bonds. See chemistry problems drawing Lewis structures.

- Identify ionic and covalent bonds.
- Learn about ionic compounds and get examples.
- Practice identifying ionic compounds.
- Get examples of binary compounds.
- Learn about covalent compounds and their properties.
- See how to assign oxidation numbers.
- Practice drawing Lewis structures.
- Practice calculating bond energy.

### Chemical Equations

Practice writing and balancing chemical equations.

- Learn the steps of balancing equations.
- Practice balancing chemical equations (practice quiz).
- Get examples finding theoretical yield.
- Practice calculating percent yield.
- Learn to recognize decomposition reactions.
- Practice recognizing synthesis reactions.
- Practice recognizing single replacement reactions.
- Recognize double replacement reactions.
- Find the mole ratio between chemical species in an equation.

### Concentration and Solutions

Learn how to calculate concentration and explore chemistry problems that affect chemical concentration, including freezing point depression, boiling point elevation, and vapor pressure elevation.

- Get example concentration calculations in several units.
- Practice calculating normality (N).
- Practice calculating molality (m).
- Explore example molarity (M) calculations.
- Get examples of colligative properties of solutions.
- See the definition and examples of saturated solutions.
- See the definition and examples of unsaturated solutions.
- Get examples of miscible and immiscible liquids.

### Error Calculations

Learn about the types of error and see worked chemistry example problems.

- See how to calculate percent.
- Practice absolute and relative error calculations.
- See how to calculate percent error.
- See how to find standard deviation.
- Calculate mean, median, and mode.
- Review the difference between accuracy and precision.

### Equilibrium Chemistry Problems

Learn about Le Chatelier’s principle, reaction rates, and equilibrium.

- Solve activation energy chemistry problems.
- Review factors that affect reaction rate.
- Practice calculating the van’t Hoff factor.

### Gas Laws

Practice chemistry problems using the gas laws, including Raoult’s law, Graham’s law, Boyle’s law, Charles’ law, and Dalton’s law of partial pressures.

- Calculate vapor pressure.
- Solve Avogadro’s law problems.
- Practice Boyle’s law problems.
- See Charles’ law example problems.
- Solve combined gas law problems.
- Solve Gay-Lussac’s law problems.

### Matter

Some chemistry problems ask you identify examples of states of matter and types of mixtures. While there are any chemical formulas to know, it’s still nice to have lists of examples.

- Practice density calculations.
- Identify intensive and extensive properties of matter.
- See examples of intrinsic and extrinsic properties of matter.
- Get the definition and examples of solids.
- Get the definition and examples of gases.
- See the definition and examples of liquids.
- Learn what melting point is and get a list of values for different substances.
- Get the azeotrope definition and see examples.
- See how to calculate specific volume of a gas.
- Get examples of physical properties of matter.
- Get examples of chemical properties of matter.
- Review the states of matter.

### Molecular Structure Chemistry Problems

See chemistry problems writing chemical formulas. See examples of monatomic and diatomic elements.

- Practice empirical and molecular formula problems.
- Practice simplest formula problems.
- See how to calculate molecular mass.
- Get examples of the monatomic elements.
- See examples of binary compounds.
- Calculate the number of atoms and molecules in a drop of water.

### Nomenclature

Practice chemistry problems naming ionic compounds, hydrocarbons, and covalent compounds.

### Nuclear Chemistry

These chemistry problems involve isotopes, nuclear symbols, half-life, radioactive decay, fission, fusion.

### Periodic Table

Learn how to use a periodic table and explore periodic table trends.

- Know the trends in the periodic table.
- Review how to use a periodic table.
- Explore the difference between atomic and ionic radius and see their trends on the periodic table.

### Physical Chemistry

Explore thermochemistry and physical chemistry, including enthalpy, entropy, heat of fusion, and heat of vaporization.

- Practice heat of vaporization chemistry problems.
- Practice heat of fusion chemistry problems.
- Calculate heat required to turn ice into steam.
- Practice calculating specific heat.
- Get examples of potential energy.
- Get examples of kinetic energy.
- See example activation energy calculations.

### Spectroscopy and Quantum Chemistry Problems

See chemistry problems involving the interaction between light and matter.

### Stoichiometry Chemistry Problems

Practice chemistry problems balancing formulas for mass and charge. Learn about reactants and products.

- Get example mole ratio problems.
- Calculate percent yield.
- Learn how to assign oxidation numbers.
- Get the definition and examples of reactants in chemistry.
- Get the definition and examples of products in chemical reactions.

### Unit Conversions

There are some many examples of unit conversions that they have their own separate page!