Percent Composition
Quiz
•
Chemistry
•
10th - 11th Grade
•
Practice Problem
•
Medium
+1
Standards-aligned
Ashley Jackson
Used 300+ times
FREE Resource
About this resource
This quiz focuses on percent composition in chemistry, a fundamental quantitative analysis topic appropriate for grades 10-11. Students must demonstrate mastery of calculating the mass percentage of elements within chemical compounds using atomic masses, molecular formulas, and molar masses. The problems require students to identify the number of atoms of each element in complex formulas including polyatomic ions, calculate total molar masses by summing individual atomic contributions, and apply the percent composition formula: (mass of element/total molar mass) × 100%. Students need solid foundational skills in reading chemical formulas with subscripts and parentheses, using the periodic table to find atomic masses, performing multi-step calculations with proper significant figures, and understanding the relationship between molecular composition and mass percentages. The quiz also incorporates the Law of Conservation of Mass, reinforcing the connection between stoichiometry and quantitative analysis that underpins all percent composition calculations. Created by Ashley Jackson, a Chemistry teacher in US who teaches grade 10-11. This assessment serves as an excellent tool for formative evaluation of student understanding before advancing to more complex stoichiometric calculations like empirical and molecular formula determination. The quiz works effectively as a warm-up activity to activate prior knowledge of molar mass calculations, as guided practice during instruction on quantitative analysis, or as homework reinforcement after introducing percent composition concepts. Teachers can use individual questions for quick checks during direct instruction or assign the complete quiz for comprehensive review before unit assessments. The variety of compounds represented—from simple binary compounds to complex polyatomic structures—allows for differentiated instruction and progressive skill building. This assessment aligns with NGSS HS-PS1-7 and common state chemistry standards that require students to use mathematical representations to support claims about atomic composition and chemical quantities.
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20 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the percent composition by mass of oxygen in the compound MgSO4 (gram formula mass = 120 g/mol)?
Tags
NGSS.HS-PS1-7
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
In which compound is the percent composition by mass of Cl equal to 42%?
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
What is the percent composition of Benzene, C6H6?
H = 50%
H = 14.3%
H = 7.8%
H = 28.1%
Tags
NGSS.HS-PS1-1
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
What is the percent composition of aluminum phosphate?
P = 25%
O = 75%
P = 35.8%
O = 42.1%
P = 25.4%
O = 60.3%
P = 25.4%
O = 52.5%
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
What percent of Zn3(PO4)2 is zinc?
33.15%
16.04%
50.80%
19.68%
Tags
NGSS.HS-PS1-7
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the percent composition of a compound that contains 40.8 g carbon and 54.4 g oxygen?
42.9 %; 57.1% oxygen
52.9 %; 57.1% oxygen
42.9 %; 45.23% oxygen
55.9 %; 99.1% oxygen
Tags
NGSS.MS-PS1-1
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