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Specific heat capacity

Chemistry • Energy & Heat in Chemical Processes • Knowledge-Based • 5 questions

Specific heat capacity Knowledge-Based Download PDF

Chemistry · Thermochemistry & Thermodynamics · Chemistry · Energy & Heat in Chemical Processes

5 Chemistry practice questions on Specific heat capacity. Questions that assess core concepts and understanding.

Questions

  1. 1.

    What does a high specific heat capacity indicate about the thermal behavior of a substance?

    • A) It requires a relatively large quantity of heat to raise the temperature of a unit mass of the substance by one degree.
    • B) It transfers thermal energy through conduction at a much higher rate than substances with low specific heat capacities.
    • C) It experiences a large increase in temperature upon absorbing a very small amount of thermal energy.
    • D) It undergoes a phase transition at a lower temperature because less energy is needed to disrupt intermolecular forces.
  2. 2.

    Which molecular-level characteristic best explains why liquid water has an unusually high specific heat capacity compared to many other common liquids?

    • A) Intramolecular covalent O–H bonds absorb incoming heat by breaking and reforming continuously during modest temperature changes.
    • B) A rigid crystalline lattice forms throughout the liquid that completely suppresses all rotational and vibrational degrees of freedom.
    • C) Much of the absorbed heat energy is consumed in breaking and distorting extensive intermolecular hydrogen bonds rather than solely increasing translational kinetic energy.
    • D) Delocalized valence electrons move freely across the fluid to store thermal energy as electrical potential energy.
  3. 3.

    Which of the following statements correctly distinguishes heat capacity from specific heat capacity for a pure substance?

    • A) Both heat capacity and specific heat capacity are extensive properties that depend directly on the mass of the sample.
    • B) Heat capacity is an intensive property characteristic of the substance, whereas specific heat capacity is an extensive property that increases with sample size.
    • C) Both heat capacity and specific heat capacity are intensive properties that remain constant regardless of the quantity of substance present.
    • D) Heat capacity is an extensive property that depends on the mass of the sample, whereas specific heat capacity is an intensive property characteristic of the substance itself.
  4. 4.

    Equal masses of copper and water, initially at the same temperature, absorb identical quantities of heat energy without undergoing a phase change. Given that the specific heat capacity of water is 4.18 J/(g·°C) and that of copper is 0.385 J/(g·°C), which statement correctly compares their resulting temperature changes?

    • A) Copper experiences a significantly greater temperature increase than water.
    • B) Water experiences a significantly greater temperature increase than copper.
    • C) Both substances experience identical temperature increases because equal amounts of thermal energy were supplied.
    • D) Copper experiences a smaller temperature increase because materials with lower specific heat capacities resist temperature change more effectively.
  5. 5.

    A 50.0 g sample of an unknown metal absorbs 1050 J of heat, causing its temperature to rise from 25.0 °C to 75.0 °C. What is the specific heat capacity of the metal?

    • A) 0.21 J/(g·°C)
    • B) 0.42 J/(g·°C)
    • C) 2.38 J/(g·°C)
    • D) 21.0 J/(g·°C)