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Which of the following solutions has the highest concentration of solute?


A) 1) 0 mol solute in 200 mL solvent
B) 2) 0 mol solute in 500 mL solvent
C) 3) 0 mol solute in 1 L solvent
D) 4) 0 mol solute in 1.5 L solvent

E) All of the above
F) B) and C)

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Which of the following statements accurately describes alpha particles in terms of charge and mass?


A) Alpha particles are positively charged and less massive than beta particles.
B) Alpha particles are negatively charged and less massive than beta particles.
C) Alpha particles are positively charged and more massive than beta particles.
D) Alpha particles are negatively charged and more massive than beta particles.

E) B) and D)
F) C) and D)

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Which of the following describes a particle that contains 36 electrons, 49 neutrons, and 38 protons?


A) an ion with a charge of 2 -
B) an ion with a charge of 2 +
C) an atom with a mass of 38 amu
D) an atom with a mass of 49 amu

E) B) and D)
F) A) and B)

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Which of the following examples is evidence of a physical change?


A) Ice cream melts in a bowl.
B) A silver spoon tarnishes over time.
C) An electrical current splits water into hydrogen and oxygen.
D) A person inhales oxygen and exhales carbon dioxide and water.

E) A) and C)
F) A) and B)

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Which of the following are most directly involved in chemical bonding?


A) protons
B) neutrons
C) alpha particles
D) valence electrons

E) None of the above
F) A) and D)

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