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 Mass Stoichiometry

Mass Stoichiometry

The Mass Stoichiometry Concept Builder provides plenty of practice converting from the mass of reactant to the mass of product (or a comparable conversion). Each question organizes information in a table where each column of the table represents a species in a given chemical equation. For each row of the table, students are provided the mass of a reactant or a product and must calculate the corresponding mass of reactant(s) reacted and/or product(s) produced. The Concept Builder consists of 18 questions spread across three difficulty levels. The Apprentice Difficulty Level includes a synthesis reaction (two reactants and one product) and 10 calculations. The provided numbers are "nice"; they are typically a whole number multiple of the molar mass. The Master Difficulty Level includes a hydrocarbon combustion reaction (two reactants and two products) and 12 calculations. The provided numbers are "nice". The Wizard Difficulty Level also includes a hydrocarbon combustion reaction and 12 calculations. The provided numbers are "nasty". A built-in number pad makes numerical entry very easy on mobile devices. Feedback is immediate and students can correct their incorrect answers. Help is provided for each difficulty level.

🚀︎ Launch Concept Builder

Users are encouraged to open the Concept Builder and begin. There is no need for an activity sheet for this Concept Builder.

Learners and Instructors may also be interested in viewing the accompanying Notes page. Technical information, teaching suggestions, and related resources that complement this Interactive are provided on the View Notes.