Water has a specific heat of 4.184 J/g deg while glass (Pyrex) has a specific heat of 0.780 J/g degree. If 10.0 J of heat is added to 1.00 g of each of these, which will experience the larger increase in temperature?
Correct answer: A. Glass
- A. Glass
- B. Water
- C. They both will experience the same change in temperature since only the amount of substance relates to the increase in temperature
- D. None
Explanation
The correct answer is Glass. The specific heat capacity of a substance tells us how much energy is required to change the temperature of a unit mass of the substance by one degree Celsius. Glass has a specific heat of 0.780 J/g°C, which is lower than water's specific heat of 4.184 J/g°C. This means that for the same amount of heat added, glass will experience a larger increase in temperature compared to water because it requires less energy to change its temperature. The other options are incorrect because they do not take into account the influence of specific heat capacity on the temperature change.
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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