Atomic Theory Quiz

Who proposed the theory in the 4th century B.C. that the universe is made up of individual particles called "atoms"?

• John Dalton

• Albert Einstein

• Democritus

• Isaac Newton

According to Dalton's Atomic Theory, what is true about atoms of a given element?

• They are exactly alike.

• They can be divided into smaller parts.

• They are all different.

• They cannot combine with other elements.

What did Democritus believe about the particles he called "atoms"?

• They were indivisible and indestructible.

• They could be created and destroyed.

• They were divisible into smaller parts.

• They were always in motion.

According to Dalton's Atomic Theory, how do atoms of different elements form compounds?

• By combining in whole number ratios.

• By combining in random proportions.

• By merging into a single type of atom.

• By existing independently without combining.

Tags

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What is a common point between Democritus' theory and Dalton's Atomic Theory regarding the nature of atoms?

• Atoms are indivisible.

• Atoms can be transformed into energy.

• Atoms are divisible into smaller particles.

• Atoms are constantly moving and colliding.

What does the Law of Definite Proportions state in Dalton's Theory?

• A) A chemical compound always contains the same elements in varying proportions by mass.

• B) A chemical compound always contains different elements in the same proportions by mass.

• C) A chemical compound always contains the same elements in the same proportions by mass.

• D) A chemical compound never contains the same elements in the same proportions by mass.

Are all parts of Dalton's Theory still accepted in modern chemistry?

• Yes, all parts are still accepted.

• No, some parts are no longer accepted.

• Yes, but only in organic chemistry.

• No, the entire theory has been disproven.

Tags

NGSS.HS-PS1-7

What did J.J. Thomson's model suggest about atoms?

• Atoms are indivisible

• Atoms are the smallest particle

• Atoms are divisible

• Atoms cannot be detected

What did J.J. Thomson use to discover sub-atomic particles?

• A cathode ray tube

• A microscope

• A spectroscope

• A particle accelerator

According to J.J. Thomson's model, what are electrons?

• Positively-charged sub-atomic particles

• Neutrally-charged sub-atomic particles

• Negatively-charged sub-atomic particles

• Particles larger than an atom