Atomic Theory Quiz

What word comes from the Greek and means "indivisible"?

• Atom

• Molecule

• Element

• Compound

What proposals did Democritus make?

• The world is made of empty space and tiny particles called atoms

• The world is flat and rests on a giant turtle

• The world is made of fire and water

• The world is an illusion

Who opposed Democritus' ideas?

• Other philosophers like Aristotle

• Scientists like Newton

• Mathematicians like Euclid

• Astronomers like Copernicus

What was Antoine Lavoisier's conclusion?

• When a chemical reaction occurs, matter is neither created nor destroyed

• Matter is created and destroyed in reactions

• Atoms are made of water and fire

• Elements can transform into gold

What is the name given to Lavoisier's conclusion?

• Law of Conservation of Matter

• Law of Gravity

• Law of Motion

• Law of Thermodynamics

What was Joseph Proust's contribution to the modern atomic theory?

• Elements that composed the compounds were always in a certain proportion by mass

• Elements are made of fire and water

• Elements can change into other elements

• Elements are illusions

What is the name given to Proust's conclusion?

• Law of Definite Proportions

• Law of Gravity

• Law of Motion

• Law of Thermodynamics

What aspect of Dalton's theory was later modified?

• Atoms are made of even smaller particles

• Atoms are indestructible

• Atoms are the largest particles

• Atoms are made of water

Thomson's experiment was the cathode ray tube.

• True

• False

What happened during Thomson's experiment with cathode rays?

• Rays bent toward a positively charged plate and away from a negatively charged plate

• Rays bent toward a negatively charged plate and away from a positively charged plate

• Rays did not bend at all

• Rays bent in random directions