Physical Science Ch. 3

What did Democritus suggest about matter?

• That matter existed in the form of very small, indivisible particles

• That matter could be subdivided an unlimited number of times.

• That matter was continuous.

The law of electrostatic charges states that (SELECT ALL that apply)

• opposite electric charges attract each other. & like electric charges repel each other.

• Most of an atom consists of empty space.

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J. J. Thomson discovered the existence of what?

• atom

• electron

• neutron

What did the experiments involve that led to the discovery of the nucleus?

• alpha particles and gold foil

• the chemical reactions of gases

• Crookes tubes and cathode rays

• the emission spectrum

Which of the following is NOT a reason that the Bohr model is still in widespread use today?

• It is fairly simple and easy to understand.

• It remains useful for showing how chemical bonding works.

• It is still the most workable model to date.

• It represents energy levels in a way that is easier to visualize than more recent models.

Carbon-14 is different from carbon-12 in that it has a different number of

• electrons

• neutrons

• protons

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Which of the following is not a way that an ion can be formed?

• An atom can gain extra electrons.

• An atom can lose electrons.

• An atom can lose a neutron.

John Dalton thought that atoms are indivisible and cannot be destroyed

• True

• False

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Most of an atom consists of empty space.

• True

• False

Quantum mechanics deals with the behavior of _______ and _________ at the atomic and subatomic levels.

• matter and energy

• heat and cold

• density and volume

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