
Balancing Equations
Authored by Priya Arora
9th - 10th Grade
Used 708+ times

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About
This quiz focuses on chemical equation balancing, a fundamental topic in chemistry that typically aligns with high school level coursework, specifically grades 9-10. Students need a solid understanding of atomic structure, chemical formulas, and the Law of Conservation of Mass to successfully complete these problems. The core concepts assessed include identifying reactants and products in chemical equations, understanding the difference between coefficients and subscripts, counting atoms in chemical formulas including those with parentheses, and systematically balancing equations by adjusting coefficients to ensure equal numbers of each type of atom on both sides. Students must also grasp that mass is conserved in chemical reactions, meaning the total number of atoms of each element must remain constant from reactants to products. The quiz requires both conceptual knowledge of chemical equation terminology and procedural skills in mathematical problem-solving to determine the correct coefficients that balance complex chemical equations. Created by Priya Arora, a chemistry teacher in Australia who teaches grades 9 and 10. This comprehensive quiz serves multiple instructional purposes in the chemistry classroom, functioning effectively as a diagnostic assessment to gauge student understanding before beginning a unit, as guided practice during instruction, or as formative assessment to identify areas needing reinforcement. Teachers can assign portions of this quiz for warm-up activities to activate prior knowledge, use it for homework to reinforce classroom learning, or implement it as a review tool before summative assessments. The varied question formats, from multiple choice coefficient identification to conceptual understanding of conservation laws, make this resource particularly valuable for differentiated instruction and scaffolded learning. The content directly supports NGSS HS-PS1-7 (using mathematical representations to support the claim that atoms are conserved during chemical reactions) and aligns with Common Core mathematical practices in problem-solving and mathematical modeling within the chemistry context.
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50 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
PCl5 + ___ H2O → ___ HCl + H3PO4
4, 5
1, 6
3, 8
2,2
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
__ Al + __ FeO → Al2O2 + __ Fe
1, 1, 2
2,1,2
2, 2, 2
2,4,2
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Mg + ___ HCl → MgCl2 + H2
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which side of a chemical equation is the reactant side?
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which side of a chemical equation os the product side?
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which problem is balanced?
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Balance this equation.
_SnO2 +_H2-->_Sn +_H2O
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