Courses
Teacher-curated, self-paced courses. Looking for a guided sequence through a full topic? See Learning Paths.
2 courses
Matter and Measurement
Chemistry · High School (11–12) · Measurement, Units and Significant Figures, Elements, Compounds and Changes
FreeCh 1 · 1/4
Sort matter into elements, compounds and mixtures, and measure it in SI units. Learn to write numbers in scientific notation, to keep the right significant figures, and to change units without mistakes.
3Lessons11Problems2Python Labs1Question Set1Mock Test
Changes, Elements and Compounds
Chemistry · High School (9–10), General · Elements, Compounds and Changes
FreeCh 2 · 3/3
Ice melting and paper burning are both changes, but they are very different. In this course we separate physical changes from chemical changes, and we learn what elements and compounds are, and how a compound differs from a mixture.
3Lessons10Problems2Python Labs1Question Set1Mock Test