Skip to Content Go to sign in Skip to Primary Navigation Skip to Secondary Navigation Skip to Page Navigation Skip to Header Navigation Skip to Footer Navigation Read more about accessability options and our navigation

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.

Return to screen reader navigation
Home Concept Builders Stoichiometry Stoichiometry Law Breakers Directions

Stoichiometry Law Breakers - Directions

Using the Stoichiometry Law Breakers Concept Builder is quite simple. You will be presented with three balanced chemical equations, an unknown quantity, and a desired quantity to determine. For each chemical equation, you will be given a set of conversion factors for determining the unknown quantity. You must identify any set of conversion factors that would not correctly determine the unknown quantity. There may be one, two, or three incorrect sets. Tap on the conversion factor set to select or deselect it. Once you have selected all the INCORRECT sets (the "law breakers"), tap on the Check Answer button. Your answers will be checked and feedback will be immediate. The Progress Report will be updated to reflect the correctness of your answer (for Task Tracker users only).

The Progress Report will display a star for any completed Question. If you miss a question, the Progress Report displays a Red background. You will at some time be delivered a similar question and you will have to answer this question correctly twice in a row in order to complete the Question. Once all questions are correctly answered, you will receive the Trophy for the difficulty level (for Task Tracker users only).

Concept Builder Teacher Notes