Curriculum
Course: Alhussan Chemistry — Stage 9
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Curriculum

Alhussan Chemistry — Stage 9

Chapter 10: Structure, Bonding, and Properties

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Chapter 11: Patterns in the Periodic Table

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Chapter 12: Chemical Reactions 3 and Rates

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Chapter 13: Planet Earth and Continental Drift

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Quiz

12.2 Writing symbol equations — Visual & Photo Quiz

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  • Questions count: 1
  • Passing grade: B+
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1.
Look at the balanced chemical equation: 2H₂ + O₂ -> 2H₂O. Why must chemical equations always be balanced with stoichiometric coefficients?
Dr Dabour Hub Academy - figure 1
To satisfy the law of conservation of mass, ensuring the exact same number of each type of atom exists on both sides
To make the equation look symmetrical on paper
Because coefficients represent the temperature in Celsius
Because atoms change into new elements during reactions
Part of Chapter 12: Chemical Reactions 3 and Rates — see every lesson and quiz in this unit.
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