Final answer:
Heat capacity is an extensive property dependent on both the substance's type and mass, while specific heat capacity is an intensive property that depends only on the substance's type.
Step-by-step explanation:
The heat capacity of a substance is determined by both the type of substance and its mass. When we refer to specific heat capacity, it's an intensive property which means it depends only on the type of substance, not the amount.
In contrast, heat capacity is an extensive property, meaning its value is proportional to the amount of the substance involved.
Therefore, when considering the internal energy of a substance, both heat and work can change it, but the heat capacity is specific to the substance's identity and mass.
An example of this can be seen in the way that doubling an object's mass would double its heat capacity. In practical terms, when measuring the heat capacity, we often indicate it using specific heat (for a unit mass) or molar heat capacity (for a mole of substance), both of which reflect the substance's nature and amount.