Watch Sal work through Part 1 of an SAT Reading: History and social studies passage. Watch the next lesson: https://www.khanacademy.org/test-prep/new-sat/new-sat-reading-writing/new-sat-reading/v/reading-history-questions?utm_source=YT&utm_medium=Desc&utm_campaign=NewSAT Missed the previous lesson? https://www.khanacademy.org/test-prep/new-sat/new-sat-reading-writing/new-sat-reading/v/reading-literature-questions?utm_source=YT&utm_medium=Desc&utm_campaign=NewSAT SAT on Khan Academy: Practice all of the skills you’ll need for the new SAT. We also have four official practice exams from College Board. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. ... https://www.youtube.com/watch?v=ELgQQjRhkic Note: All Khan Academy content is available for free at (www.khanacademy.org)

Physical and chemical processes can be classified by the changes occurring on the molecular level. In general, chemical processes involve changes in chemical bonds, while physical processes involve changes only in intermolecular forces. Some process do not fit neatly into one category: for example, when NaCl dissolves in water, ionic bonds are broken (suggesting a chemical process), but no new substances are formed (suggesting a physical process). View more lessons or practice this subject at https://www.khanacademy.org/science/ap-chemistry-beta/x2eef969c74e0d802:chemical-reactions/x2eef969c74e0d802:physical-and-chemical-changes/v/physical-and-chemical-changes-molecular-level Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate or volunteer today! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc ... https://www.youtube.com/watch?v=3e8e0d1fWLk Note: All Khan Academy content is available for free at (www.khanacademy.org)