Semester 1 Exam Review part 2

Front

Convert 79,000 inches to km (1 km = 0.621 mile and 1 mile = 5280 feet)

Back

2.01 km

Front

What Model of the atom is represented here?

Back

Bohr

Front

The gold foil experiment led to the conclusion that each atom in the foil was composed of mostly empty space because most alpha particles directed at the foil ____

Back

passed through the foil

Front

While J. J. Thomson was carrying out experiments on cathode rays, he determined that the rays consisted of particles he called 'corpuscles.' These particles were later named —

Back

electrons

Front

Who first proposed the concept of a small indivisible particle that makes up everything in the universe?

Back

Democritus

Front

What is the definition of an atom?

Back

The smallest unit of a chemical element, consisting of a nucleus surrounded by electrons.

Front

What is the significance of the gold foil experiment?

Back

It demonstrated that atoms have a small, dense nucleus and are mostly empty space.

Front

What did J. J. Thomson discover about cathode rays?

Back

He discovered that they are made of negatively charged particles called electrons.

Front

What is the difference between protons, neutrons, and electrons?

Back

Protons are positively charged, neutrons are neutral, and electrons are negatively charged.

Front

What is the atomic theory proposed by Dalton?

Back

All matter is made of atoms, which are indivisible and indestructible.