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Grade 9
Chemical Reactions
9. Reactions
9.2 Balancing Equations, Conservation of mass
Balancing Chemical Equations & the Law of Conservation of Mass
Discover how atoms are rearranged never created or destroyed and learn to balance chemical equations using the Law of Conservation of Mass.
What You'll Learn
Atoms are rearranged but never created or destroyed in reactions.
Coefficients balance equations while subscripts define molecular formulas.
Total reactant mass always equals total product mass in reactions.
Balanced equations demonstrate conservation of mass with equal atoms.
What You'll Practice
1
Students balance equations for reactions like zinc and hydrochloric acid.
2
Learners verify conservation of mass by counting atoms on both sides.
3
Practice distinguishes coefficients from subscripts in chemical equation balancing.
Why This Matters
Mastering the Law of Conservation of Mass and equation balancing is the cornerstone of quantitative chemistry, enabling students to accurately predict and analyze every chemical reaction they will encounter.
This Unit Includes
Practice exercises
Learning resources
Skills
Conservation of Mass
Balancing Equations
Coefficients
Chemical Reactions
Atomic Conservation
NS Curriculum Aligned