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Chemistry Problems

Worked Chemistry Problems

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The best way to learn chemistry is to practice working problems, but it helps to see how each type of problem is solved. Follow examples of worked chemistry problems. These chemistry problems are arranged alphabetically according to subject. Multiple worked examples are given for several types of problems.

Accuracy, Precision and Error

This target has been hit with a high degree of accuracy, yet a low degree of precision.
DarkEvil, Wikipedia Commons
Accuracy refers to the agreement between experimental data and a known value. Error is a measure of the accuracy of the values in your experiment. Precision refers to how well experimental values agree with each other.

Acid-Base Titration

Titration
MissCGlass, stock.xchng
An acid-base titration is a neutralization reaction that is performed in the lab in order to determine an unknown concentration of acid or base. The moles of acid will equal the moles of base at the equivalence point. Here's how to perform the calculation to find your unknown.

Atomic Mass & Atomic Weight

This is a basic diagram of an atom, with protons, neutrons and electrons labeled.
AhmadSherif, Wikipedia Commons
The terms 'atomic mass' and 'atomic weight' are used interchangeably in chemistry problems. You can use atomic weight to calculate isotopic abundance or you can find the atomic mass from the element abundance.

Avogadro's Number

You can use Avogadro's number to work problems concerning mass and the number of particles in a sample.

Balancing Chemical Equations

Sometimes it helps to refer to a worked example problem.
John Lund, Getty Images
A chemical equation describes what happens in a chemical reaction. The equation identifies the reactants and products, the formulas of the participants, the phases of the participants, and the amount of each substance. Here's how to balance chemical equations for mass and charge.

Basic Mathematical Calculations

This is a vector that goes from A to B.
Silly rabbit, Wikipedia Commons
You need to understand how to work basic algebra and geometry problems in order to master chemistry. Here are examples of common problem types:

Calorimetry and Heat Flow

This is a bomb calorimeter with its bomb.
Harbor1, Creative Commons License
A calorimeter is a device used to measure the quantity of heat flow in a chemical reaction. Two of the most common types of calorimeters are the coffee cup calorimeter and the bomb calorimeter.

Carbon-14 Dating

Deinonychus Dinosaur Skull
Bob Ainsworth, morguefile.com
Carbon-14 dating a method of estimating the age of organic material based on the decay rate of carbon-14.

Chemical Reactions

A Florence flask or boiling flask can withstand temperature changes.
Nick Koudis/Getty Images
A chemical reaction is a chemical change which forms new substances.

Colligative Properties

Boilng point elevation is an example of a colligative property.
Markus Schweiss
Colligative properties include vapor pressure, freezing point depression and boiling point elevation. Collegative properties depend on the number of particles in a solvent and not on the mass of the particles.
Tools for Working Chemistry Problems

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