AP Chem Review 1

Which of the following combinations of atoms would most likely result in an ionic compound?

• Fluorine and chlorine

• Lithium and magnesium

• Carbon and oxygen

• Barium and bromine

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NGSS.HS-PS1-1

A reaction occurs where 7.0 x 1012 atoms of hydrogen gas (H2) combines with 3.5 x 1012 atoms of graphite (C). Which of the following molecular models is inconsistent with this data?

• CH4

• C2H8

• C3H12

• CH2

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NGSS.HS-PS1-7

Nitrogen dioxide gas (NO2) can react with itself to form a different compound. Which of the following is the most likely formula for this new compound?

• N2O

• NO4

• NO

• N2O4

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NGSS.HS-PS1-2

Which subatomic particle has the smallest mass?

• Proton

• Atom

• Neutron

• Electron

An ionic compound has the unit formula of X3Z2. Which of the following correctly identifies the appropriate charges on the ions in this compound?

• X3-, Z2+

• X3+, Z2-

• X2-, Z3+

• X2+, Z3-

An anion has a charge of 2- (X2-). Which of the following correctly describes the process that resulted in that charge?

• The atom lost two protons
• The atom lost two neutrons
• The atom gained two protons
• The atom gained two electrons

The cathode ray tube experiment helped prove the existence of subatomic particles. Who was the scientist that conducted this experiment?

• John Dalton

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

An isotope is a variant of a particular element that differs in the number of:

• Neutrons

• Electrons

• Protons

• Atoms

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NGSS.HS-PS1-8

Which of the following is the empirical formula for hexane, C6H14?

• C12H28

• C3H7

• C2H

• CH2

The results of Rutherford’s gold foil experiment showed very few alpha particles interacted strongly with the gold atoms. Which of the following best describes the results of this experiment?

• The atom consisted of a small, dense region of positive charge and a large volume of nearly empty space.

• The atom consisted of an even distribution of positive and negative charges (“plum pudding model”).

• The electron shell model of the atom needed revision.

• The results suggested a quantum model for the atom.

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