What assumption is made regarding the heat capacity on the MCAT?

The assumption that heat capacity does not change significantly with temperature is based on the premise that for many practical applications, especially at relatively small temperature ranges, the specific heat capacities of substances can be treated as constants. This is particularly useful when analyzing processes where temperature changes are not large enough to cause substantial variations in heat capacity.

In many cases, especially in introductory chemistry, the heat capacity of a substance is approximated as constant over a limited temperature range. This simplification allows for easier calculations when applying the heat equation (q = m * C * ΔT), where q is heat added or removed, m is mass, C is heat capacity, and ΔT is the change in temperature.

Assuming heat capacity remains constant facilitates straightforward numerical problems and theoretical concepts. While in reality, heat capacity does vary with temperature for most substances, the assumption is commonly accepted for many MCAT problems due to the scope and context in which they are presented.