Quiz on the Timeline of the Atomic Theory

Joseph Proust is best known for his work on which principle in chemistry?

• Law of Conservation of Mass

• Law of Definite Proportions

• Law of Multiple Proportions

• Law of Combining Volumes

The Law of Definite Proportions, proposed by Proust, states that:

• Elements are composed of small, indivisible particles called atoms.

• All samples of a given compound have the same elements in the same proportion by mass.

• Atoms of different elements can combine in simple, whole-number ratios to form compounds.

• The volume of a gas is directly proportional to the number of moles of gas present.

Proust's experiments on chemical compounds involved studying the proportions of elements in compounds of which substance?

• Water

• Oxygen

• Hydrogen

• Carbon dioxide

Which of the following statements represents Joseph Proust's conclusion based on his experiments?

• All elements are composed of atoms.

• Atoms combine in multiple proportions to form compounds.

• Elements can be converted into one another by chemical reactions.

• Chemical compounds have fixed proportions of elements by mass.

Joseph Proust's work laid the foundation for the development of which fundamental concept in chemistry?

• Periodic table of elements

• Theory of relativity

• Atomic model

• Chemical Calculations

John Dalton's atomic theory proposed that:

• Atoms are indivisible and indestructible particles.

• Atoms can be divided into smaller subatomic particles.

• Atoms of different elements have different structures.

• Atoms are made up of protons, neutrons, and electrons.

According to Dalton's atomic theory, atoms of the same element are:

• Identical in mass but different in size.

• Identical in size but different in mass.

• Identical in both mass and size.

• Different in both mass and size.

Dalton suggested that chemical reactions occur when atoms:

• Combine to form molecules of different elements.

• Rearrange to form new compounds.

• Are destroyed and replaced by subatomic particles.

• Disintegrate into smaller particles.

Dalton's atomic theory was supported by experimental evidence from studies of which phenomenon?

• Radioactivity

• Cathode rays

• X-rays

• Chemical reactions

One of the essential points in Dalton's atomic theory was the concept of the law of multiple proportions, which states that:

• Atoms combine in simple, whole-number ratios to form compounds.

• All samples of a given compound have the same elements in the same proportion by mass.

• The ratio of the masses of two elements in a compound is always a whole number or a simple fraction.

• The volume of a gas is directly proportional to the number of moles of gas present.