12 Questions
What did Leucippus and Democritus propose about the composition of matter?
They proposed that matter is ultimately composed of small, indivisible particles called atoms.
What did Leucippus and Democritus name the small, indivisible particles?
They named them atomos.
Who were some influential Greek thinkers who did not embrace the atomic ideas of Leucippus and Democritus?
Plato and Aristotle.
What did Plato and Aristotle believe about the composition of matter?
They believed that matter had no smallest parts and that different substances were composed of various proportions of fire, air, earth, and water.
Why did Aristotle's view prevail over the atomic ideas of Leucippus and Democritus?
Aristotle was influential and there was no experimental way to test the competing ideas.
What observations led John Dalton to offer evidence supporting the atomic ideas of Leucippus and Democritus?
Certain observations in the early 1800s
When was Brownian motion described by Einstein?
1905
Who experimentally verified the description of Brownian motion in 1908?
Perrin
What is the atomic theory?
The atomic theory is the idea that all matter is composed of atoms.
What are the four main points of John Dalton's atomic theory?
- Each element is composed of tiny, indestructible particles called atoms. 2. All atoms of a given element have the same mass and other properties that distinguish them from the atoms of other elements. 3. Atoms combine in simple, whole-number ratios to form compounds. 4. Atoms of one element cannot change into atoms of another element.
What happens to atoms in a chemical reaction?
In a chemical reaction, atoms only change the way they are bound together with other atoms.
Who explained the laws discussed with his atomic theory in 1808?
John Dalton explained the laws with his atomic theory in 1808.
Test your knowledge on the ancient Greek philosophers who first proposed the idea of atoms. Discover the theories of Leucippus and Democritus and their belief that matter is made up of small, indestructible particles. Explore the concept of atomos and how it shaped our understanding of the world.
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