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Balance It Right: Conservation of Atoms

Balance equations without changing formulae

ScienceGrade 10Mixed12 questions24 min

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Skills

Balance equations containing polyatomic groups, Identify errors in incorrectly balanced equations, Classify decomposition reactions, Balance equations from common laboratory reactions, Classify combination reactions

Question types

multiple choice

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Section A: Law of Conservation and Basic Balancing · 6 questionsSection B: Polyatomic Ions, Combustion and Mistake Checks · 6 questions

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Section A: Law of Conservation and Basic Balancing

Use atom counts to balance simple equations.

Pick the balanced equation or correct balancing idea.

Question 1

Easymultiple_choice

A balanced chemical equation follows the law of:

Topic: Balancing Chemical Equations · Skill: Balance equations containing polyatomic groups

Question 2

Easymultiple_choice

Which is the balanced form of $H_2 + O_2 \rightarrow H_2O$ ?

Topic: Balancing Chemical Equations · Skill: Identify errors in incorrectly balanced equations

Question 3

Mediummultiple_choice

Balance: $N_2 + H_2 \rightarrow NH_3$ .

Topic: Balancing Chemical Equations · Skill: Identify errors in incorrectly balanced equations

Question 4

Mediummultiple_choice

Which coefficient is needed before $O_2$ in $2Mg + O_2 \rightarrow 2MgO$ ?

Topic: Balancing Chemical Equations · Skill: Identify errors in incorrectly balanced equations

Question 5

Advancedmultiple_choice

Which balancing step is incorrect?

Topic: Balancing Chemical Equations · Skill: Classify decomposition reactions