Module 3 Structure of the Atom

Early Greek philosophers had differing ideas about matter. Democritus believed that matter was made up of

• atoms

• empty space

• water

• fire

Tags

NGSS.MS-PS1-1

Early Greek philosophers had differing ideas about matter. Aristotle said that _________________ cannot exist

• atoms

• empty space

• fire

• water

Why were Democritus's ideas not science?

• They were partially incorrect.

• They were not supported by experiment.

• They were ahead of their time.

• 
  They went against ideas of more influential philosophers.

Aristotle's ideas gained greater acceptance because ______.

• he was one of the most influential philosophers of his time

• he tested his ideas.

• he backed up his ideas with experimental evidence.

• empty space cannot exist.

Which of the following parts of John Dalton's atomic theory were not correct?

• atoms of one element differ from atoms of another

• atoms are indivisible

• atoms combine to form compounds

• matter is composed of atoms

In the figure below, if atoms of element A have a mass of 16 units and atoms of element B have a mass of 1 unit, what will be the total mass?

• 72 units

• 18 units

• 12 units

• 17 units

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

What caused the deflection of the alpha particles in Rutherford’s gold foil experiment?

• The α particles were deflected by the negatively charged gold nuclei.

• The α particles were deflected by the positively charged gold nuclei.

• The α particles were deflected by the positively charged gold electrons.

• The α particles were deflected by the negatively charged gold electrons.

Tags

NGSS.MS-PS2-5

What can you conclude from the deflection of a cathode ray in a magnetic field?

• The ray must have a positive charge.

• The ray must be composed of iron.

• The ray must be composed of charged particles.

• The ray must need to travel in a vacuum.

Tags

NGSS.MS-PS2-3

Which subatomic particle was discovered by researchers working with cathode-ray tubes?

• quark

• proton

• neutron

• electron

Which of the following particles has a mass that is almost the same as the mass of a proton?

• neutron

• beta particle

• electron

• positron