Practice Questions
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In a bomb calorimeter experiment, a sample with a mass of 2 grams is combusted, resulting in a temperature increase of 15°C. If the heat capacity of the calorimeter is known to be 4.5 kJ/°C, what is the total heat released during the combustion process, assuming thermal equilibrium is reached?
The heat capacity tells how much heat the calorimeter takes to rise one degree Celsius. Other options are incorrect because Many students think the te...
In designing a bomb calorimeter, which material property is most crucial for ensuring precise temperature measurements during calibration and subsequent combustion tests?
Low specific heat capacity means the material needs less energy to change temperature. Other options are incorrect because High thermal conductivity o...
In a calorimetry experiment, a calorimeter is calibrated to determine its heat capacity. After calibration, a substance is added that causes the calorimeter to reach thermal equilibrium at a new stable temperature. Which of the following statements best explains the importance of achieving thermal equilibrium in this context?
Thermal equilibrium means the temperature no longer changes, so all heat has moved into the calorimeter. Other options are incorrect because Equilibri...
When a substance is burned in a calorimeter, how does the temperature change relate to the energy released during combustion?
Heat released from burning moves into the calorimeter’s water and walls. Other options are incorrect because Some think a hotter flame would cool the ...
When determining the heat of combustion for a fuel in a bomb calorimeter, which factor primarily influences the accuracy of the energy measurement obtained?
The calorimeter’s heat capacity tells us how much heat it can absorb for each degree of temperature rise. Other options are incorrect because People t...
In bomb calorimetry, what does a significant temperature increase indicate about the substance being tested?
When a substance burns in a sealed bomb, it releases heat. Other options are incorrect because Thinking a stable substance gives a big temperature cha...
A chemist is investigating a new biofuel composed of a complex mixture of organic compounds. They decide to use bomb calorimetry to assess the energy content of this fuel. What key factors should the chemist consider when interpreting the results of their calorimetry experiment, especially regarding the structure and stability of the compounds involved?
The shape of each molecule matters. Other options are incorrect because Some think the outside temperature is ignored, but the calorimeter is not perf...
Which of the following statements correctly describe the principles of bomb calorimetry? Select all that apply.
Bomb calorimetry uses a sealed chamber to burn a sample, and the heat released changes the water temperature around it. Other options are incorrect be...
In bomb calorimetry, the primary measurement taken to determine the energy change of a reaction is the change in __________.
When a substance burns in the bomb, the heat released moves into the surrounding water. Other options are incorrect because Many think pressure change...
Which of the following compounds would likely yield the highest energy release when combusted in a bomb calorimeter?
Hexane has many carbon–hydrogen bonds that release a lot of energy when they break and new bonds form. Other options are incorrect because Some people...
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