Around 400 BC, Greek philosopher Democritus proposed that matter is made of indivisible particles called:
2.04 Video: Crash Course Chemistry #37

Quiz
•
Chemistry
•
9th - 12th Grade
•
Easy
Mrs. Pangerl
Used 11+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Plum pudding
Atomos
Electrons
Answer explanation
Democritus believed the indivisible atomos of every material had the properties of the material.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Lavoisier proposed the idea that even if matter changes shape or form, its mass stays the same. This idea is:
The Law of Conservation of Mass
Unsupported by experiments
Answer explanation
Lavoisier is considered the father of modern chemistry for the Law of Conservation of Mass. He also identified the role of oxygen in combustion, named oxygen and hydrogen, and helped construct the metric system.
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
In the 1800s, John Dalton determined that:
The positive charge of an atom is concentrated in the nucleus
Electrons are more likely to be found in orbitals
Elements exist as discrete packets of matter. Matter is made of solid, indivisible atoms and atoms of an element are identical.
Answer explanation
Dalton's theory is sometimes called the "Billiard Ball Model" for the solid atoms. He also found that atoms combine in fixed, whole number ratios to form compounds.
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Thomson's experiments indicated cathode rays were actually small, negatively charged particles. He called them corpuscles. What did Thomson discover?
The proton
The neutron
The electron
Answer explanation
Thomson imagined negatively charged electrons distributed randomly in a positively charged matrix, like the English dessert plum pudding.
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Which atomic model is depicted in this picture?
Billiard Ball Model
Plum Pudding Model
Quantum Model
Answer explanation
Because plum pudding is not as popular outside England, this model is sometimes referred to as a "chocolate chip cookie" model.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Rutherford's gold foil experiment led to:
The discovery of a positively-charged nucleus
The discovery of the electron
Answer explanation
Rutherford is considered to be the father of nuclear physics as he discovered the positively-charged nucleus of the atom.
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Most alpha particles passed through the atoms undeflected, which indicated to Rutherford that:
Most of the atom is empty space
The billiard ball model was correct
Answer explanation
Rutherford also bombarded nitrogen with alpha particles, which resulted in hydrogen ions. He recognized that these positive ions were protons.
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