AAHS General Chemistry Unit 3 Lecture 1 Content Review

Which philosopher believed that matter was made of indivisible and indestructible atoms?

• Aristotle

• Democritus

• Boyle

• Alchemy

Individual atoms retain the chemical and physical properties of their element.

• True

• False

Robert Brown discovered Brownian motion. He observed that particles move independently due to the collision of atoms. What idea did this observation lead to?

• That atoms can exist in different states of matter.

• That only gaseous atoms are in constant motion.

• That all atoms are constantly in motion.

• That all atoms are never in motion.

According to the Billiard Ball Model, scientists believed that atoms were featureless balls that were indivisible. Atoms are actually made of what type of particles?

Which subatomic particle did J.J. Thomson discover using the cathode ray tube?

• Proton

• Neutron

• Electron

• Gravitron

In the plum pudding model of the atom, where are the electrons located?

• In the nucleus

• Outside the nucleus

• Randomly throughout the entire atom

• Electrons are not apart of the plum pudding model

Based on the Gold Foil experiment, what did Rutherford discover about the atom? (select all that apply)

• A small, positively-charged area called the nucleus

• The subatomic particle known as the neutron

• The electron cloud where electrons are located

• That the atom is mostly empty space

According to Neils Bohr, where are electrons located in the atom?

• Electrons ONLY exist on certain energy levels called orbitals

• Electrons exists on and between different energy levels

• Electrons exist throughout the atom in no particular pattern

• Electrons are located within the nucleus

Electrons in orbitals closest to the nucleus have the highest energy.

• True

• False

In order for electrons to jump up to a higher energy level, do they need to absorb or release energy?