Quiz on Atomic Theory

Dalton’s atomic theory was accepted because

• there was evidence to support it.

• Democritus said that it was correct.

• Dalton invented the electron microscope.

• Dalton showed how molecules are formed.

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Atoms have no electric charge because they

• have an equal number of charged and noncharged 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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According to the new model of the atom, electrons behave like

• planets orbiting the sun.

• light energy in a vacuum.

• waves on a vibrating string.

• planets rotating on their axes.

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

• color.

• charge

• position.

• mass.

Valence electrons determine an atom’s

• mass.

• electric charge.

• chemical properties.

• period.

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A mole is an SI base unit that describes the

• mass of a substance.

• volume of a substance.

• amount of a substance.

• electric charge of a substance.

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If the atomic mass of carbon is 12 u, 1 mole of pure carbon will have a mass of

• 6 g.

• 12 g.

• 6 mol.

• 12 mol.

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You have 85.5 g of fluorine, which has a molar mass of approximately 19 g/mol. How many moles of fluorine do you have?

• 4.5 mol

• 19 mol

• 45 mol

• 85 mol

Democritus’s original atomic theory was revised because it

• claimed matter is made of atoms.

• claimed atoms could 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 cannot be divided.

• Atoms of an element are alike.

• Atoms are made of electrons.

• Atoms of different elements form compounds.

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