Dalton's Atomic Theory

Dalton's Atomic Theory

In 1808, this English schoolteacher proposed his own atomic theory that became widely accepted

Dalton’s Atomic Theory:

–All elements are made of tiny atoms.

–Atoms cannot be subdivided.

–Atoms of the same element are exactly alike.

–Atoms of different elements can join to form molecules.

Democritus (460-370 B.C.)

• Was a Greek philosopher who proposed that world is made up of empty space and tiny particles called atoms.

• He thought that atoms are the smallest particles of matter and that different types of atoms exist for every type of matter.

Multiple Choice

Democritius thought that ____ are the smallest particles of matter.

• Electrons

• Protons

• Atoms

• Neutrons

Multiple Select

Which of the following are parts of Dalton's atomic Theory?

• All elements are made of tiny atoms.

• Atoms cannot be subdivided.

• Atoms of the same element are exactly alike

• Atoms of different elements can join to form molecules.

• Atoms are divisible

Proust (leading up to Dalton)

• 1799 Proust observed the composition of water was always 11 percent by mass hydrogen and 89 percent by mass oxygen.

• He then studied other compounds and noticed that reguardless of the sample this was always true.

Multiple Choice

What compound did Proust use to come up with the Law of Definite Proportions?

• Salt

• Water

• Air

• Gold

Multiple Choice

Which Part of the Scientific Method is supported many experiments and scientists?

• Hypothesis

• Theory

• Law

• Experiment

Multiple Choice

What is the formula for atmospheric Nitrogen?

• NO₂

• N₂

• NO₃

• N

Multiple Choice

What compound did Proust use to come up with the Law of Definite Proportions?

• Salt

• Water

• Air

• Gold