Empirical Formulas
Authored by M Trent
Chemistry
10th - 12th Grade
NGSS covered
Used 235+ times
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About
This quiz comprehensively covers empirical formulas and stoichiometry, foundational topics in high school chemistry appropriate for grades 10-12. Students must demonstrate mastery of multiple interconnected concepts to succeed on these problems. The core skills assessed include understanding the definition and purpose of empirical formulas as the simplest whole-number ratio of elements in a compound, converting between empirical and molecular formulas using molar mass data, and performing percent composition calculations. Students need strong computational abilities to work with percentage data, convert percentages to moles using atomic masses, determine mole ratios, and simplify these ratios to whole numbers. The quiz also requires knowledge of fundamental stoichiometric concepts including molar mass calculations, Avogadro's number, mole-to-gram conversions, and hydrate analysis through experimental data interpretation. Created by M. Trent, a Chemistry teacher in the US who teaches grades 10 and 12. This assessment serves multiple instructional purposes and can effectively function as homework practice, formative assessment during the stoichiometry unit, or review material before summative evaluations. The variety of question formats allows teachers to use individual problems as warm-up activities or compile sections for focused practice sessions on specific skills like percent composition or molecular formula determination. The quiz aligns with Next Generation Science Standards HS-PS1-7, which requires students to use mathematical representations to support the claim that atoms are conserved during chemical reactions, and Common Core mathematical practices that emphasize precision in calculations and mathematical modeling. Teachers can utilize this resource to build student confidence with empirical formula calculations before advancing to more complex stoichiometric relationships in chemical equations.
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44 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
An empirical formula:
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements. (keep two decimal places throughout calculations)
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What is the empirical formula of the following molecular formula: C3H6
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which pair has the same empirical formula?
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A compound came out with the following ratio
3 Carbon: 1.49 Phosphorus: 2 Oxygen- what would be the empirical formula?
6.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
What is the empirical formula if you have 88.80% copper and 11.20% oxygen?
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the empirical formula for a compound containing: 92.30% carbon and 7.70% hydrogen
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