Watch the full video at https://www.jove.com/v/11430?utm_sour... Explore our full chemistry video textbook at https://www.jove.com/science-educatio... JoVE is the world-leading producer and provider of science videos with a mission to accelerate scientific research and education. Millions of scientists, educators and students across 1500+ High Schools, colleges and universities worldwide use JoVE’s library of 17,000+ videos for teaching, learning and research. JoVE High Schools offers expert-created video textbooks, lab videos, science experiment videos, interactive assessments, and seamless integration into school systems. These comprehensive learning resources help educators tackle teaching challenges, engage students, and meet curriculum requirements, enhancing the high school learning experience. Subscribe to our YouTube Channel - / @jovehighschools Follow us on - Facebook - / jovehighschools Instagram - / jovehighschools The standard free energy change for a reaction can only be determined if it occurs under standard state conditions—when both the reactants and products are in their standard states. However, most chemical reactions do not occur under these conditions. Under any conditions—standard or nonstandard—the relative amount of products and reactants present in a reaction is described by the reaction quotient, Q.