Practice Problems with Answers

(Organized mostly as in Zumdahl Chemistry)
All Practice Problems provided include Answers

Chemical Foundations
measurement, significant figures, precision & accuracy, conversion factors, matter

Atoms, Molecules and Ions
atomic theory, intro to Periodic Table, formulas & names of compounds

Stoichiometry and Equations
mole, molar mass, percentage composition, calculating formula, chemical equations, stoichiometry, limiting reactant, yield

Reactions in Aqueous Solutions
precipitation reactions, acid-base reactions, molarity, solution stoichiometry

Atomic Structure and Periodicity
atomic spectra, Bohr model for H atom, electron configurations, quantum numbers, periodic trends

Bonding
covalent & ionic bonding, Lewis structures, molecular geometry & polarity, orbital hybridization, sigma and pi bonding

Organic Chemistry
saturated, unsaturated, & aromatic hydrocarbons, functional groups, polymers

Gases
gas laws, gas stoichiometry, partial pressure, kinetic theory

Thermochemistry
calorimetry, enthalpy, Hess’ Law

Liquids & Solids
intermolecular forces, types of solids, vapor pressure, phase diagrams

Solutions
types of solutes, concentration, solubility, colligative properties

Kinetics
reaction rate, factors affecting rate, activation energy, reaction mechanisms, catalysis

Equilibrium
equilibrium calculations, equilibrium constant, Le Chatelier’s Princinciple

Acids and Bases
models, pH and pOH, strong and weak acids and bases, Ka, Kb, salts

Applications of Aqueous Equilibria
buffers, titrations, titration curves, pH indicators, Ksp

Electrochemistry
oxidation & reduction; voltaic cells, standard half-cell voltages

Nuclear Chemistry
radioactivity, radioactive decay, nuclear fission, fusion

Other Resources

 

Chemical Foundations

Study Questions; Answers

Practice Problems: Conversion Factors; Answers

Practice Problems: Classification of Matter; Answers

Go to the bottom of this page for links to worksheets on Significant Figures, Scientific Notation and Metric Conversions from the ChemTeam


Atoms, Molecules and Ions

Study Questions; Answers

Practice Problems: Naming compounds from formula and vice versa; Answers

Practice Finding Name and Formula with Answers

Practice Problems: Periodic Table and simple ionic compounds; Answers

Ionic nomenclature interactive quizzes: Click the Formulas button to go from the name to the formula. Click the Names button to go from the formula to the name.

 

Stoichiometry and Equations

Study Questions; Answers

More Study Questions; Answers

Practice Problems: Percent composition and empirical formula; Answers

Practice Problems: Stoichiometry; Answers

Practice Problems: Writing and classifying equations; Answers

Practice balancing chemical equations (interactive)
Click "Balancing Chemical Equations Tutorial" on the left

From the Chem Team: Worksheet of mass mole conversions
Answers to Worksheet of mass mole conversions

Here's a tutorial from ChemTutor on classifying and balancing chemical equations with Practice Problems on the bottom of the page

Stoichiometry Worksheet with a link to Answers from the ChemTeam

 

Reactions in Aqueous Solutions

Study Questions; Answers

More Study Questions; Answers

Practice Problems: Determining whether a precipitate forms; Answers

Dilution practice problems; scroll to the bottom of the page

 

Atomic Structure and Periodicity

Study Questions; Answers

Electron configuration practice (interactive)
Scroll down on the left and Click "Complete Electron Configurations"

Practice Quiz on electron configurations. Under Science, click on Elements. On the left, click the box for Electrons. Then select a Question Style.

 

Bonding

Study Questions; Answers

Web site with practice finishing Lewis structures: Select a compound from the drop down menu. Click "check structure" to check your answer.

Molecules 360: Select a molecule from the "List of Molecules" menu on the right to see its 3-D structure. Click the "images" tab for its Lewis structure.

Animation of Orbital hybridization


Organic Chemistry

Study Questions; Answers

More Study Questions; Answers

Animations of Condensation Reactions:
Simple animations for condensation reactions between a carboxylic acid and an alcohol and between a carboxylic acid and an amine. They run in loops. Clicking the red oval pauses the animation and the green oval resumes it.

From Lee Marek's web site, here's a way to remember the hydrocarbon prefixes. The first letter of each word in the following statement is the 1st letter of each of the 10 alkanes in order.
"Mary Eats Peaches, But Paul Has Had Only Nine Donuts."

 

Gases

Study Questions; Answers

More Study Questions; Answers

Practice Problems: Gas laws; Answers

Practice Problems from the ChemTeam: Partial pressure problems;
Combined gas law problems

 

Thermochemistry

Study Questions; Answers

More Study Questions; Answers

 

Liquids & Solids

Study Questions; Answers

 

Solutions

Study Questions; Answers

More Study Questions; Answers

Worksheet of Molarity Problems from the ChemTeam

Worksheet of Problems from the ChemTeam on density, mass percent, molality and molarity. These problems have the answers worked out in detail.

Practice Problems on Molarity from ChemTutor

animation of salt dissolving

another animation of salt dissolving

 

Kinetics

Animations of Reaction Mechanisms

Study Questions; Answers

 

Equilibrium

Study Questions; Answers

LeChatelier's Principle problems from the ChemTeam

LeChatelier's Principle problems from ScienceGeek

 

Acids and Bases

Study Questions; Answers

More Study Questions; Answers

 

Applications of Aqueous Equilibria

Study Questions; Answers

More Study Questions; Answers

 

Electrochemistry

Study Questions; Answers

Practice problems from ChemTutor: Scroll to the bottom of the page for problems on finding oxidation states, identifying which substance is oxidized or reduced and balancing redox equations.

Practicing balancing equations. First click "Balancing Redox Rxns" on the left. Then click "Practice." Click on an equation to choose it. Then drag reactants and products into the space to balance each 1/2 equation and change the number in the box. Click the arrow to check when you are done with each. There's also links on the left for problems on finding oxidation states and identifying oxidizing and reducing agents.

 

Nuclear Chemistry

Study Questions; Answers

 

Other Resources

Quizlet: An MIT freshman created a great tool for making online flashcards and using them to quiz yourself (and your friends). The site also includes flashcards other people have made. I recommend starting with the Video Tour.