MCAT General Chemistry Freestanding Practice Questions: Phases

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1. In the dissociation of phosphoric acid, the trend Ka1 > Ka2 > Ka3 is predominantly due to:

  • A. II only
  • B. III only
  • C. II and III only
  • D. I, II and III

2. Which of the following substances has the atom with the greatest oxidation state?

  • A. absorbed, internal energy decreases, and entropy decreases.
  • B. released, internal energy increases, and entropy decreases.
  • C. released, internal energy decreases, and entropy decreases.
  • D. released, internal energy decreases, and entropy increases.

3. In the following phase transition diagram, Substance X is in the solid phase during Segment A and in the gas phase during Segment C. What process is occurring during Segment B?

  • A. The substance is warming.
  • B. The substance is cooling.
  • C. Sublimation
  • D. Condensation

4. Denver is at a higher altitude than Los Angeles and therefore the atmospheric pressure is lower in Denver than in Los Angeles. Compared to Los Angeles, the melting point of water in Denver will be:

  • A. higher.
  • B. lower.
  • C. the same.
  • D. undetermined from the information given.

5. At 1 atm, deionized water can remain a liquid at temperatures down to –42°C. If a foreign body is added to the supercooled liquid, it will immediately turn into ice. Which of the following is true about this process?

  • A. The reaction is exothermic.
  • B. Tap water could also be supercooled to -42°C.
  • C. The transformation of a supercooled fluid to a solid is nonspontaneous.
  • D. Water's unique phase diagram allows it to be supercooled.

6. A pot containing 0.5 L of water at sea level is brought to 100°C. It is insulated around its sides to minimize heat loss to the environment, and heat is applied at the bottom of the container at a rate of 6 kJ/min over 3 minutes. What is the resulting temperature of the water? (∆Hvap = 40.7 kJ/kg; c(g) = 1.9 kJ/kg • °C; c(l) = 4.2 kJ/kg • °C)

  • A. 115°C
  • B. 108°C
  • C. 104°C
  • D. 100°C