Quiz on the Law of Definite Proportions

Who discovered the Law of Constant Composition, also known as the Law of Definite Proportions?

• John Dalton

• Joseph Proust

• Antoine Lavoisier

• Jons Jacob Berzelius

In what year was Joseph Proust's Law of Constant Composition first published?

• 1776

• 1826

• 1794

• 1811

Who disagreed with Proust's law, stating that chemical combination was not restricted to definite saturation proportions?

• Antoine Lavoisier

• John Dalton

• Jons Jacob Berzelius

• Claude-Louis Berthollet

What is the ratio of hydrogen to oxygen by mass in pure water according to Proust's Law of Constant Proportion?

• 1:1

• 1:6

• 1:8

• 1:10

How did John Dalton contribute to the acceptance of Proust's Law of Constant Proportion?

• By establishing the relationship with Berzelius' theory

• By classifying solutions as chemical combinations

• By discovering the Law of Multiple Proportions

• By formulating the Atomic Theory

What is the percentage of oxygen in cupric oxide (CuO) based on the given experiments?

• 30.1%

• 25.3%

• 20.15%

• 15.2%

In the second experiment, how much copper oxide was formed when 1.179 g of copper was dissolved in nitric acid?

• 1.397 g

• 1.179 g

• 1.298 g

• 1.476 g

What conclusion can be drawn from the results of the experiments regarding the law of constant composition?

• The law is disproved

• The law is inconclusive

• The law is illustrated

• The law is irrelevant