Question

scientists in a laboratory were working with insulin, a protein often used to treat diabetes. they left two identical vials of insulin in different places. this table shows how the temperature of each vial changed over 15 minutes. vial initial temperature (°c) final temperature (°c) vial on the counter 2.5 5.7 vial in the refrigerator 2.5 3.9 during this time, thermal energy was transferred from __ to __ each vial... the surroundings the surroundings... each vial

Explanation:

Step1: Recall heat - transfer principle

Heat transfers from a higher - temperature region to a lower - temperature region.

Step2: Analyze vial temperatures

The initial temperature of both vials is 2.5°C. The final temperature of the vial on the counter is 5.7°C and of the vial in the refrigerator is 3.9°C. In both cases, the temperature of the vials increased.

Step3: Determine heat - transfer direction

Since the temperature of the vials increased, thermal energy was transferred from the surroundings to each vial.

Answer:

the surroundings ... each vial