Question 3 (1 point) Why was a bomb calorimeter used in this analysis instead of
ID: 574808 • Letter: Q
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Question 3 (1 point) Why was a bomb calorimeter used in this analysis instead of a coffee-cup calorimeter? Select all that apply. a) In a bomb calorimeter, the reaction takes place in the water. b) A bomb calorimeter is used to measure high temperature reactions. c) A bomb calorimeter is used to measure the heat flow of the reaction which is always equal to the magnitude of the enthalpy change. d) A bomb calorimeter is used to measure the heat flow of reactions involving gases e) A bomb calorimeter can be pressurized to many atmospheres of pure oxygen to promote rapid and full combustion of the sample.Explanation / Answer
Correct Answer is B, D, E
A coffee cup calorimeter is great for measuring heat flow in a chemical solution, but it can't be used for reactions, which involve gases since they would escape from the cup. The coffee cup calorimeter can't be used for high-temperature reactions either since these would melt the cup. A bomb calorimeter is used to measure heat flow for solids with low to high-temperature reactions.
A bomb calorimeter works in the same manner as a coffee cup calorimeter, with one big difference. In a coffee cup calorimeter, the reaction takes place in the water. In a bomb calorimeter, the reaction takes place in a sealed metal container, which is the bomb vessel. The bomb vessel is then placed in an insulated adiabatic chamber (polystyrene insulation in some models).
The other major difference is that the bomb vessel is a sealed high-pressure vessel. The bomb vessel, with the sample inside, is inflated to 30 Bar with pure oxygen. The oxygen assists the burning process of the sample to guarantee a complete burn.
A coffee cup calorimeter is great for measuring heat flow in a solution, but it can't be used for reactions which involve gases since they would escape from the cup. The coffee cup calorimeter can't be used for high-temperature reactions, either, since these would melt the cup. A bomb calorimeter is used to measure heat flows for gases and high-temperature reactions.
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