Calorimetry & Enthelpy: Effects on Temperature in an Insulated Chamber

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In summary, the reaction 2H2O(l) -> 2H2(g)+O2(g) with a delta H of +571.5 kJ is endothermic and will result in a decrease in temperature if carried out in an insulated chamber. This is because the reaction requires the absorption of heat from its surroundings to proceed. The equation ΔH=-CΔT can be used to determine the change in temperature.
  • #1
madgab89
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Homework Statement


For the reaction 2H2O(l) -> 2H2(g)+O2(g) delta H = +571.5 kJ

If the reaction is carried out in an insulated chamber what effect would the reaction have on the temperature in the chamber? Why?

The attempt at a solution
I can't seem to get my head around this one. I know the sign on the enthalpy change is from the point of view of the system...but what really qualifies as the system and the surroundings if there is no real boundary between them?
 
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  • #2
Wait...if I look at the equation
delta H=-CdeltaT

In order for delta H to be positive wouldn't temperature change have to be negative?
 
  • #3
A positive ΔH indicates that the reaction is endothermic; the reaction requires the absorption of heat in order to proceed. So, you are correct. The temperature will decrease because the reaction absorbs heat from its surroundings.
 

1. What is calorimetry and how does it relate to temperature in an insulated chamber?

Calorimetry is the measurement of the amount of heat energy released or absorbed during a chemical reaction or physical process. In an insulated chamber, calorimetry can be used to measure the change in temperature that occurs due to the release or absorption of heat energy.

2. How does the flow of heat energy affect the temperature in an insulated chamber?

The flow of heat energy, also known as enthalpy, directly affects the temperature in an insulated chamber. When heat energy is released, the temperature of the chamber will increase, and when heat energy is absorbed, the temperature will decrease.

3. What factors can influence the accuracy of temperature measurements in calorimetry?

There are several factors that can affect the accuracy of temperature measurements in calorimetry. These include the quality and calibration of the thermometer used, the insulation of the chamber, and any external factors that may affect the temperature, such as drafts or changes in atmospheric pressure.

4. How can calorimetry be used to determine the specific heat capacity of a substance?

By measuring the change in temperature and the amount of heat energy released or absorbed during a reaction or process, the specific heat capacity of a substance can be calculated using the formula Q = mcΔT, where Q is the heat energy, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.

5. What are some real-world applications of calorimetry and enthalpy in an insulated chamber?

Calorimetry and enthalpy are used in various industries and fields, such as chemistry, physics, and engineering. They are commonly used to measure the energy content of food, determine the efficiency of power plants, and study the thermodynamics of chemical reactions. In environmental science, calorimetry can also be used to measure the impact of human activities on the Earth's climate.

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