Atoms And Molecules: Laws That Explain Chemical Change

See why chemical reactions still obey mass and fixed composition

ScienceGrade 9Mixed10 questions20 min

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Section A: Core Ideas · 5 questionsSection B: Application Practice · 5 questions

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Practise the first group of related skills.

Choose the best answer for each question.

Question 1

EasyQuestion

A closed flask contains reactants before a chemical reaction and products after it. Which observation supports the law of conservation of mass?

Topic: Chemical Laws · Skill: State law of conservation of mass

Question 2

MediumQuestion

Which setup best verifies conservation of mass in the reaction between barium chloride and sodium sulphate solutions?

Topic: Chemical Laws · Skill: Verify law of conservation of mass

Question 3

MediumQuestion

Water from any pure source always contains hydrogen and oxygen in the mass ratio $1:8$ . Which law does this support?

Topic: Chemical Laws · Skill: State law of constant proportions

Question 4

AdvancedQuestion

Which statement agrees with Dalton atomic theory?

Topic: Dalton Atomic Theory · Skill: Explain Dalton atomic theory

Question 5

MediumQuestion

If $10\,g$ of calcium carbonate gives $5.6\,g$ of calcium oxide and carbon dioxide, what mass of carbon dioxide is produced in a closed system?

Topic: Chemical Laws · Skill: State law of conservation of mass

Build confidence with conservation of mass, constant proportions and Dalton atomic theory.

State law of conservation of mass, Verify law of conservation of mass, State law of constant proportions, Explain Dalton atomic theory