Richard Langley Books

5 Steps To A 5: AP Chemistry 2018
5 Steps To A 5: AP Chemistry 2018

By John Moore, John T. Moore, Richard Langley, John T. Moore, EdD, Richard H. Langley, PhD

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**Get ready to ace your AP Chemistry Exam with this easy-to-follow, multi-platform study guide**__5 Steps to a 5: AP Chemistry__ introduces an easy to follow, effective 5-step study plan to help yo...

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5 Steps To A 5: AP Chemistry 2019
5 Steps To A 5: AP Chemistry 2019

By John T. Moore, Richard H. Langley, Richard Langley, John Moore, John T. Moore & Richard H. Langley

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A PERFECT PLAN FOR THE PERFECT SCORE Score-Raising Features Include:•4 full-length practice exams with thorough answer explanations, 2 in the book + 2 on Cross-Platform•Hundreds of practice exercis...

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General Chemistry
General Chemistry

By Richard Langley, Moore John

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Chemistry 2e
Chemistry 2e

By OpenStax

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If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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