Question

what explains the key difference between a bomb calorimeter and a coffee cup calorimeter?
a bomb calorimeter is 10 times larger but works the same way.
a bomb calorimeter measures heat for liquid products only.
a bomb calorimeter has a separate chamber to hold substances and can even measure heat gain or loss for reactions that do not occur in water.
a bomb calorimeter can measure heat gain or loss in gaseous reactions but is not useful for reactions that occur at high pressures and temperatures.

Explanation:

• Analyze each option:
• First option: Bomb calorimeter's size isn't the key difference, and it doesn't work the same way as coffee cup. Eliminate.
• Second option: Bomb calorimeter isn't limited to liquid products. Eliminate.
• Third option: Bomb calorimeter has a sealed chamber (bomb) to hold substances, can handle reactions not in water (like combustion), while coffee cup is for aqueous/simple reactions. This matches the key difference.
• Fourth option: Bomb calorimeter is used for reactions at constant volume (high pressure/temp - like combustion), so this statement is wrong. Eliminate.

Answer:

C. A bomb calorimeter has a separate chamber to hold substances and can even measure heat gain or loss for reactions that do not occur in water.