Physical Science-Benchmark #2

Which scientist first proposed the nuclear model of the atom through the gold foil experiment?

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

• John Dalton

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What is the definition of density?

• The resistance of a fluid to flow

• The measure of how well a solute dissolves

• The mass per unit volume of a material

• The temperature at which a solid becomes a liquid

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In a supersaturated solution, what occurs?

• The solution can dissolve more solute

• The solution is at maximum capacity

• The solution contains less solute than possible

• The solution contains more solute than it should be able to hold

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Which state of matter has particles with the highest kinetic energy?

• Solid

• Liquid

• Gas

• Plasma

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What type of force holds an atom together?

• Repulsive force between electrons

• Attractive force between the nucleus and electron cloud

• Repulsive force between protons

• Attractive force between neutrons

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In a single replacement reaction, what occurs?

• Two compounds exchange ions

• One element replaces another in a compound

• Three elements combine

• A compound breaks down

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Which is NOT a sign of a chemical reaction?

• Release of light

• Change in mass

• Formation of a precipitate

• Temperature change

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How does increasing temperature affect reaction rate?

• Has no effect

• Decreases the rate

• Increases the rate

• Only affects solid reactants

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What is the prefix for 8 atoms in a covalent compound name?

• Octa-

• Hepta-

• Nona-

• Deca-

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In a combustion reaction, what is always a reactant?

• Water

• Carbon dioxide

• Oxygen

• Nitrogen

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