Law of Constant Composition (Grade 10 NSC Matric Physical Sciences): Quizzes

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Law of Constant Composition
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What does the law of constant composition state?

Elements combine in same proportion

What is the atomic ratio of hydrogen to oxygen in water (H2OH_2O)?

2:12:1

What percentage of water's mass comes from oxygen?

94%94\%

What is the atomic ratio in hydrogen peroxide (H2O2H_2O_2)?

1:11:1 (H to O)

What happens when reactants aren't added in correct ratios?

Unreacted material is left over

What does Gay-Lussac's Law state about gas volumes?

They react in small whole number ratios

In 2H2(g)+O2(g)→2H2O(l)2H_2(g) + O_2(g) \rightarrow 2H_2O(l), what volume ratio of H2H_2 to O2O_2 is needed?

2:12:1

In N2(g)+3H2(g)→2NH3(g)N_2(g) + 3H_2(g) \rightarrow 2NH_3(g), what volume of H2H_2 reacts with 1 vol. N2N_2?

3 volumes

Why is the law of constant composition useful?

Predict amounts needed for reactions

Does the law of constant composition apply to mixtures?

No, only to compounds

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