–Each element consists of tiny invisible particles called atoms –All atoms of the same element are identical in size, mass, and properties ( not quite ) but atoms of different elements are different in size, mass, and properties. –Atoms cannot be subdivided, created, nor destroyed (not quite) . –Atoms of different elements combine in simple, whole-number ratios to form compounds. –In chemical reactions, atoms are combine, separated, or rearranged.

Quantum Mechanical Atomic Theory

1.All matter is composed of atoms. 2.Atoms of one element differ in properties from atoms of another element. 3.Atoms are divisible into smaller particles called subatomic particles. 4.A given element is made up of atoms with different masses. (Isotopes) 5.Chemical reaction involves only the combination, separation, or rearrangement of atoms. 6.Compounds are formed by the combination of atoms in small whole number ratios.

Quantum Mechanical Atomic Theory

"Atomic Fingerprints" Used to identify elements in samples, stars, and atmospheres of planets.

gas discharge tube amalgamation

Which laws did John Dalton base his atomic theory on? (Multi-Select)

Law of definite proportions (constant composition)

Dalton's Law of Quantum Mechanics

The beam of electrons was deflected away from the negative charge plate proved that

electrons are negatively charged

electrons are a fundamental particle (found in all matter)

electrons are positively charged

The beam of electrons caused the paddle wheel to spin

electrons are a fundamental particle (found in all matter)

electrons are positively charged

electrons are negatively charged

The beam of electrons (cathode rays) where produced no matter what metal the cathode was made out of.

electrons are a fundamental particle (found in all matter)

electrons are positively charged

electrons are negatively charged

What did they expect to happen to the alpha particles in the gold foil experiment?

all of the alpha particles to pass straight through the gold foil

half to be deflected and half to pass straight through the gold foil

all of the alpha particles to bounce back from the gold foil

most to pass straight through, some deflected at a small angle, and a few to bounce almost straight back

What actually happened to the alpha particles in the gold foil experiment?

most to pass straight through, some deflected at a small angle, and a few to bounce almost straight back

half to be deflected and half to pass straight through the gold foil

all of the alpha particles to pass straight through the gold foil

all of the alpha particles to bounce back from the gold foil

In the gold foil experiment, some of the alpha particles were deflected at a small angle proving

that the nucleus is positively charged

the existence of a small volume with a large mass inside the atom

that the atom is mostly empty space

the existence of a large volume with a small mass in the center of the atom

that the nucleus is negatively charged

In the gold foil experiment, most of the alpha particles passed straight through proving

that the atom is mostly empty space

the existence of a small volume with a large mass inside the atom

that the nucleus is positively charged

the existence of a large volume with a small mass in the center of the atom

that the nucleus is negatively charged

In the gold foil experiment, a few of the alpha particles bounced almost straight back proving

the existence of a small volume with a large mass inside the atom

that the atom is mostly empty space

that the nucleus is positively charged

the existence of a large volume with a small mass in the center of the atom

that the nucleus is negatively charged

What causes Brownian motion of pollen grains in water?

the collision of water molecules with the grains of pollen

diffusion of the water molecules

C05 Atomic Theory Homework

Authored by Bill Habiger

Chemistry

10th Grade - University

Used 23+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Thought all matter was made up of the elements: earth, air, water, and fire.

Democritus

Ernest Rutherford

John Dalton

Aristotle

J.J. Thomson

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Gold Foil Experiment

Neils Bohr

Democritus

John Dalton

Ernest Rutherford

JJ Thomson

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Cathode Ray Tube Experiment

Neils Bohr

Democritus

John Dalton

Ernest Rutherford

JJ Thomson

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

First person to suggest the idea of the atom.

Democritus

Ernest Rutherford

John Dalton

Aristotle

J.J. Thomson

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

His work discovered atoms have a nucleus, positive protons, and electrons that travel around nucleus

Neils Bohr

Democritus

John Dalton

Ernest Rutherford

JJ Thomson

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

This contains most of the mass of an atom

Electron Cloud

Nucleus

Electron

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

This particle is found in the nucleus and has a positive charge

Electron

Proton

Neutron

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C05 Atomic Theory Homework

Thought all matter was made up of the elements: earth, air, water, and fire.

Gold Foil Experiment

Cathode Ray Tube Experiment

First person to suggest the idea of the atom.

His work discovered atoms have a nucleus, positive protons, and electrons that travel around nucleus

This contains most of the mass of an atom

This particle is found in the nucleus and has a positive charge

This particle is found in the nucleus and has no charge

This is a negatively charged particle found outside the nucleus

All matter is made of what?

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