Question

As the temperature of this substance rises from 20°C to 50°C, the substance ___ heat, and its kinetic energy ___.

A) absorbs; increases
B) releases; increases
C) absorbs; remains constant
D) remains constant; increases

Answer 1

The substance absorbs heat and its kinetic energy increases as its temperature rises from 20°C to 50°C, in accordance with the kinetic-molecular theory.

Step-by-step explanation:

As the temperature of a substance rises from 20°C to 50°C, the substance absorbs heat, and its kinetic energy increases. This is explained by the kinetic-molecular theory, which states that the temperature of a substance is related to the average kinetic energy of its particles. When heat is absorbed, this increases the motion of the particles, which in turn raises the temperature. Therefore, the correct answer to the question is A) absorbs; increases.