Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
Bomb calorimetry measures temperature changes to determine energy changes in reactions.
B
The pressure in a bomb calorimeter remains constant during the combustion process.
C
It is primarily used to measure the energy content of food.
D
The combustion of a substance in a bomb calorimeter occurs in a sealed environment.
E
Bomb calorimetry can only be used for gases.
Understanding the Answer
Let's break down why this is correct
Answer
In bomb calorimetry the sample is burned in a sealed, water‑filled bomb so that all the heat released goes into heating the water; the calorimeter is insulated to prevent heat loss to the surroundings. The temperature rise of the water, multiplied by its known heat capacity, gives the heat of combustion. Because the reaction is complete and the calorimeter is well insulated, the measured heat is essentially the chemical energy of the sample. For example, burning 1 g of glucose in a 1‑L water bath that rises 0. 5 °C shows a heat release of about 4 kJ, calculated from the water’s heat capacity (4.
Detailed Explanation
Bomb calorimetry uses a sealed chamber to burn a sample, and the heat released changes the water temperature around it. Other options are incorrect because Many students think the bomb keeps the pressure constant like a kitchen oven, but it actually keeps volume constant; Bomb calorimetry can test foods, but it is not limited to them.
Key Concepts
Bomb Calorimetry
Energy Measurement
Combustion Reactions
Topic
Bomb Calorimetry
Difficulty
easy level question
Cognitive Level
understand
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