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Physics Classroom is making strides to make our site accessible to everyone. Our site contains 6 navigation areas. The Primary, Secondary, and Page Level navigations have a screen reader version of their nav structure that allows using the left and right keys to navigate sibling navigation items, and up or down keys to navigate parent or child navigation items. The others can be navigated using tabs. The Primary Navigation handles the first 2 levels of site pages. The Secondary (which is not always available) handles the 3rd and 4th level of structure. The Page level navigation allows you to navigate the current page's headings quickly. The Header Navigation contains the Light/Dark Mode toggle, Search, Notifications and account login. The Breadcrumb Navigation contains the breadcrumb of the current page. If the current page has a breadcrumb, you can get to it by skipping to the content and tabbing in reverse (shift plus tab). The Footer Navigation contains links such as Privacy, Contact, about and terms. Some resources contain an Audio Player that can be activated by holding down the T key for 3 seconds, and then using K to pause and resume. While not every area of Physics Classroom is usable purely from keyboard and screen reader, we are committed to continue work on making this possible. If you have questions or need additional help, please use this link to contact us.

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Concept Builders - Matter

Knowledge of matter really matters. Dust off your periodic table and get ready to learn about the properties and states of matter.

Activities

Density Ranking Tasks

🞋︎ Learning Goal: To rank the density of three samples of matter based on information about the massiveness of its particles and the amount of space they take up.

Classification of Matter

🞋︎ Learning Goal: To identify samples of matter as being pure substances or mixtures (homogenous or heterogeneous) and to distinguish between elements and compounds.

Metals, Nonmetals, and Metalloids

🞋︎ Learning Goal: To identify the difference between metals, nonmetals, and metalloids and to be able to place an element into one of these categories.

Name That Element

🞋︎ Learning Goal: To express a comfort with the organization of the periodic table, including concepts related to family names, periods, groups, metals, nonmetals, metalloids, atomic number, and atomic mass.

Particles .. Words .. Formulas

🞋︎ Learning Goal: To associate the particle representation of a sample of matter with the proper verbal description and formulas.

Chemical vs. Physical Properties

🞋︎ Learning Goal: To identify a stated property as being either a chemical or a physical property.

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