Physical Science Chapter 4 Test Review

Dalton's atomic theory was accepted because

• there was evidence to support it

• Democritus said that it was correct

• Dalton invented the electron microsocpe

• Dalton showed how molecules were formed

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NGSS.HS-PS1-7

Atoms have no electric charge because they

• have an equal number of charged and non-charged particles

• have neutrons in their nuclei

• have an equal number of electrons and protons

• have an equal number of neutrons and protons

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NGSS.HS-PS1-7

According to modern atomic theory, it is nearly impossible to determine an electron's exact

• color

• position

• charge

• mass

Valence electrons determine an atom's

• mass

• chemical properties

• electric charge

• period

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A mole is an SI base unit that describes the

• mass of a substance

• amount of a substance

• volume of a substance

• electric charge of a substance

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Democritus's original atomic theory was revised because it

• claimed matter is made of atoms

• claimed atoms can be divided

• explained what electrons are

• did not have a scientific basis

Which of these statements is not part of Dalton's atomic theory?

• atoms can not be divided

• atoms of an element are alike

• atoms are made of electrons

• atoms of different elements form compounds

A subatomic particle that has a negative charge is called a(n)

• molecule

• electron

• element

• compound

Thompson is responsible for discovering that an atom contains

• electrons

• molecules

• anodes

• a nucleus

Two different isotopes of an element have different

• numbers of neutrons

• numbers of protons

• atomic numbers

• numbers of electrons

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NGSS.HS-PS1-8