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iRubric: Stoichiometry rubric
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Stoichiometry
Stoichiometry
In this assignment you are asked to use your knowledge to determine the number of grams of carbon dioxide produced in the combustion reaction of 234 g of ethane gas.
Rubric Code:
C43288
By
IrmaNydegger
Draft
Public Rubric
Subject:
Chemistry
Type:
Homework
Grade Levels:
(none)
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Stoichiometry
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Poor
0 pts
Fair
1.5 pts
Good
3 pts
Balancing equations
Poor
You are able to include most of the reactants and products of the combustion reaction, but cannot balance it.
Fair
You are able to write the reaction, but not balance it.
Good
You are able to write the reaction and balance it.
Molar mass
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Poor
You are unable to identify that the molar mass of ethane is dependent on the atomic masses of its elements, and unable to find the molar mass.
Fair
You are able to identify that the molar mass of ethane is dependent on the atomic masses of its elements, but unable to find the molar mass.
Good
You are able to identify that the molar mass of ethane is dependent on the atomic masses of its elements, and able to add them together to find the molar mass.
Using molar conversion factors
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Poor
You are able to take the mass in grams of ethane and divide it by the molar mass to find moles. You are unable to use the molar ratios from the reaction to find the moles of carbon dioxide. You are unable to use the molar mass of carbon dioxide to convert it to grams of carbon dioxide.
Fair
You are able to take the mass in grams of ethane and divide it by the molar mass to find moles. You are able to use the molar ratios from the reaction to find the moles of carbon dioxide. You are unable to use the molar mass of carbon dioxide to convert it to grams of carbon dioxide.
Good
You are able to take the mass in grams of ethane and divide it by the molar mass to find moles. You are able to use the molar ratios from the reaction to find the moles of carbon dioxide. You are able to use the molar mass of carbon dioxide to convert it to grams of carbon dioxide.
Subjects:
Chemistry
Types:
Homework
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