Question

this part insulates the reaction chamber from the transfer of heat to or from the surrounding environment.
this part contains a known amount of water, which is placed there before the experiment starts.
this part is where the metal is placed at the beginning of the experiment.
this part is used for measuring the initial and final temperatures of the water.

Explanation:

• The part that insulates the reaction chamber from heat transfer is the outer cup (B).
• The part that contains a known amount of water is the inner cup (C).
• The part where the metal is placed at the beginning of the experiment is the inner cup (C).
• The part used for measuring the initial and final temperatures of the water is the thermometer (A).

Answer:

A. Thermometer, B. Outer cup, C. Inner cup