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

12.1 Mass and energy in chemical reactions — Visual & Photo Quiz

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  • Questions count: 1
  • Passing grade: B+
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1.
Look at the closed conical flask on a digital balance where an aqueous reaction produces a gas inside a sealed balloon. What does the constant balance reading prove?
Dr Dabour Hub Academy - figure 1
In a closed system, the total mass of products equals the total mass of reactants (Law of Conservation of Mass)
Gas has negative weight that lifts the scale
Chemical reactions destroy atoms over time
The balance is unable to measure closed containers
Part of Chapter 12: Chemical Reactions 3 and Rates — see every lesson and quiz in this unit.
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