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April 24, 2012
What are the top FRQs on the past AP Chemistry test?

For those preparing for the AP Chem exam, here is a last-minute tip. Have you ever wondered what kinds of questions were most frequently asked on the previous AP Chemistry Exams in the FRQs (free-response questions)? igetCHEM.com has analyzed all the recent AP Chem Exams for the types of problems they asked. Here are the [...]

Solutions to 2011 AP Chemistry Exam

A new video of the step-by-step solutions to the 2011 AP Chemistry Exam has been released on igetCHEM.com’s YouTube channel http://youtube.com/igetchem as well as on the igetCHEM website http://igetCHEM.com.

February 13, 2012
Solutions to 2008 AP Chemistry Exam

A new video of the full solutions to the 2008 AP Chemistry Exam is now available on igetCHEM.com’s YouTube channel http://youtube.com/igetchem as well as on the igetCHEM website.

November 28, 2011
Intermolecular Forces (5)

In the last post, we talked about the Coulombic forces between ions. Ions are atoms or group of atoms (i.e. a molecule) that have an integer charge. For example, Cl- has a -1 charge, NO3- also has a -1 charge and SO42- has a -2 charge. Notice that their charges are integers, -1 or -2. [...]

November 23, 2011
Intermolecular Forces (4)

The next kind of intermolecular forces occur between charges. The force between charged particles is known as the Coulomb force. For example, a sodium ion Na+ has a +1 charge and a chloride ion Cl- has a -1 charge. Because opposite charges attract each other, there is an attractive Coulomb force between Na+ and Cl-. [...]

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