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Ch.5 - Thermochemistry
Brown - Chemistry: The Central Science 15th Edition
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBrown 15th EditionCh.5 - ThermochemistryProblema 54b
Capitolo 5, Problema 54b

Consider the data about gold metal in Exercise 5.24(b). b. Suppose that the same amount of heat is added to two 10.0-g blocks of metal, both initially at the same temperature. One block is gold metal, and the other is iron metal. Which block will have the greater rise in temperature after addition of the heat?

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Identify the specific heat capacities of gold and iron. The specific heat capacity is the amount of heat required to raise the temperature of 1 gram of a substance by 1 degree Celsius.
Recall that the specific heat capacity of gold is approximately 0.129 J/g°C, and for iron, it is approximately 0.450 J/g°C.
Use the formula for heat transfer: \( q = mc\Delta T \), where \( q \) is the heat added, \( m \) is the mass, \( c \) is the specific heat capacity, and \( \Delta T \) is the change in temperature.
Since the same amount of heat \( q \) is added to both metals and they have the same mass, the change in temperature \( \Delta T \) is inversely proportional to the specific heat capacity \( c \).
Conclude that the metal with the lower specific heat capacity (gold) will experience a greater rise in temperature compared to the metal with the higher specific heat capacity (iron).

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Specific Heat Capacity

Specific heat capacity is the amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius. Different materials have different specific heat capacities, which means they absorb and retain heat differently. For example, gold has a lower specific heat capacity than iron, meaning it will experience a greater temperature increase when the same amount of heat is added.
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Heat Capacity

Heat Transfer

Heat transfer refers to the movement of thermal energy from one object or substance to another. In this scenario, when heat is added to both blocks of metal, the heat will flow into each block, causing their temperatures to rise. The efficiency of this heat transfer is influenced by the specific heat capacity of each material, affecting how much their temperatures increase.
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Heat Capacity

Thermal Equilibrium

Thermal equilibrium is the state reached when two objects in contact no longer transfer heat between them, resulting in equal temperatures. In the context of this question, understanding thermal equilibrium helps explain how the temperature of each metal block will change in response to the same amount of heat added, ultimately leading to a comparison of their temperature rises based on their specific heat capacities.
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Thermal Equilibrium
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