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 explore. There is no need for an activity sheet for this Concept Builder. However, the 18 different questions can be viewed by teachers. View Questions (For Task Tracker Teachers Only).

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