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Articles & Books From Richard H. Langley
Practice your way to a better grade in your Chemistry class Chemistry: 1001 Practice Problems For Dummies gives you 1,001 opportunities to practice solving problems on all the topics covered in your chemistry class—in the book and online! Get extra practice with tricky subjects, solidify what you’ve already learned, and get in-depth walk-throughs for every problem with this useful book.
It’s alive! It’s alive! (Thanks to biochemistry, that is.) Biochemistry is the science of the chemical processes that allow for…well…life. If it moves, breathes, eats, or sleeps, biochemistry can probably explain how. So, it stands to reason that the fundamentals of biochemistry can get a little complicated.
Cheat Sheet / Updated 02-17-2022
Solving chemistry problems is a great way to master the various laws and calculations you encounter in a typical chemistry class. This Cheat Sheet provides some basic formulas, techniques, and tips you can refer to regularly to make solving chemistry problems a breeze (well, maybe not a breeze, but definitely easier).
Cheat Sheet / Updated 02-23-2022
Studying amino acids (the building blocks of proteins, which humans need to grow and develop) is essential in biochemistry. The four subgroups of amino acids are nonpolar, polar and uncharged, acidic, and basic. This Cheat Sheet provides a handy, quick reference to these four subgroups.Biochemistry's basic amino acidsAmino acids are important to the study of biochemistry because they’re the building blocks of proteins found in all cells.
Cheat Sheet / Updated 01-09-2023
Organic Chemistry II is one of the toughest courses you can take. Surviving isn’t easy — you probably know that from your Organic Chemistry I class. Preparation is key: If you study the basics of organic chemistry the right way, prepare for your tests, and know your aromatic systems, you’re off to a great start!
Article / Updated 03-26-2016
When completing a chemistry calculation, always write the number with the unit. Number, unit — it’s like having a first and last name.
Consistently writing down the units allows you to see what cancels and helps you spot an error when units don’t cancel. For example, look at the following conversion from miles to kilometers.
Article / Updated 03-26-2016
Amino acids are important to the study of biochemistry because they're the building blocks of proteins found in all cells. The basic group of amino acids is represented here:
Article / Updated 05-03-2023
Acid-base reactions and their associated calculations play a primary role in many chemical, biological, and environmental systems. Whether you’re determining hydrogen ion concentration, [H+]; hydroxide ion concentration, [OH˗]; pH; or pOH, an equation and a calculator are important tools to have in your toolbox.
Article / Updated 03-26-2016
A chemical equation shows what happens in a chemical reaction. As in any equation, the elements on the left side of the equation (the reactants) must equal the elements on the right (the products). Here are just a few things to remember when balancing chemical equations:
Same elements in equal numbers: For an equation to be balanced, it must have the same number of each element on each side of the equation.
Article / Updated 03-26-2016
Taking an Organic Chemistry II test has a completely deserved reputation for being tough. Make life easier by following these tips before you take your next organic chemistry exam:
Remember that the carbon atom forms four bonds.
Don’t cram the night (or even a week) before a test.
Attend class religiously.