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Is a bomb calorimeter an isolated system and is a coffee cup calorimeter a closed system?

Posted: Sun Jan 21, 2018 2:22 pm
by Isa Samad 1L
Was wondering if these two calorimeters are considered an isolated system and closed system respectively or is it the other way around?

Re: Is a bomb calorimeter an isolated system and is a coffee cup calorimeter a closed system?

Posted: Sun Jan 21, 2018 2:42 pm
by Mike Vinci 2B
The bomb calorimeter is a closed system that can exchange energy with the surroundings and is isochloric (no volume change). The coffee cup calorimeter is isolated, meaning pressure is constant and no energy can be exchanged with the surroundings, known as adiabatic conditions

Re: Is a bomb calorimeter an isolated system and is a coffee cup calorimeter a closed system?

Posted: Sun Jan 21, 2018 9:51 pm
by Anna Li 2E
The purpose of a bomb calorimeter is to calculate heat generated by a reaction (hence the name 'bomb') by measuring the difference in temperature of the water surrounding said reaction. So, if the bomb calorimeter was an isolated system, this heat transfer would be unable to occur and we would not be able to observe any change in temperature.

The purpose of a coffee cup calorimeter is to calculate the heat from a reaction mixture directly with a thermometer so it must be an isolated system in order to get the most accurate information. If the heat generated by the reaction mixture was able to escape and enter its surroundings, the temperature we record from the mixture would not be the actual energy released by the reaction.