Unit 3 · 8 lessons
The Nature of Matter
What everything is made of: how to classify matter, tell physical from chemical changes, how scientists built the model of the atom, how the periodic table is organized, what chemical formulas mean, and how the chemicals in everyday products affect people and the planet.
- 68 practice questions
- 64 flashcards
- 2 interactive lessons
Lessons
- 1Pure Substances and MixturesHow to sort any sample of matter into elements, compounds, mechanical mixtures and solutions, using what you can see and what you know about the particles inside.7 questions
- 2Physical and Chemical Properties and ChangesHow to describe a substance by its physical and chemical properties, how to calculate density, how to tell a physical change from a chemical change using five clues, and how to read the hazard symbols on household products.9 questions
- 3How Models of the Atom DevelopedHow Dalton, Thomson, Rutherford, Bohr and Chadwick each used experimental evidence to improve the model of the atom, and how the modern electron cloud model builds on their work.8 questions
- 4Protons, Neutrons, Electrons and Bohr-Rutherford DiagramsThe charge, mass and location of protons, neutrons and electrons; how to use atomic number and mass number to count them; how to draw Bohr-Rutherford diagrams for the first 20 elements; and what isotopes and ions are.Interactive9 questions
- 5The Periodic TableHow the periodic table is organized into periods and groups, how to read an element box, how metals, non-metals and metalloids differ, and the four main chemical families: alkali metals, alkaline earth metals, halogens and noble gases.9 questions
- 6Patterns in the Periodic TableHow an element's position in the periodic table reveals its atomic structure: the period gives the number of electron shells, the group gives the number of valence electrons, and these explain the patterns in reactivity, ion charges and atom size.Interactive9 questions
- 7Compounds and Chemical FormulasWhat a chemical formula tells you, how to count the atoms in a formula (including coefficients and brackets), how ionic and molecular compounds differ, and why simple ionic compounds have the formulas they do.9 questions
- 8Chemistry, Consumer Products and SocietyThe life cycle of a consumer product and the elements inside it, the social, environmental and economic impacts at each stage, how to dispose of household chemicals safely, and how green chemistry and emerging technologies are changing the products we use.8 questions