Balance It Right: Conservation Of Atoms

Balance equations without changing formulae

ScienceGrade 10Mixed12 questions24 min

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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

EasyQuestion

A balanced chemical equation follows the law of:

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

Question 2

EasyQuestion

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

MediumQuestion

Balance: $N_2 + H_2 \rightarrow NH_3$ .

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

Question 4

MediumQuestion

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

AdvancedQuestion

Which balancing step is incorrect?

Topic: Balancing Chemical Equations · Skill: Classify decomposition reactions

What this assignment covers

Practise balancing equations using coefficients, conservation of mass, polyatomic ions and common mistake checks.

Skills and sections

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

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