When the law of conservation of energy is applied to heat, it is known as the law of thermodynamics. a) zeroth b) first c) second d) third

b     first

Explanation:

first law of thermodynamics: energy can neither be created or destroyed; however, when heat is added to a system, energy can be changed from one form to another.

This is the first law of thermodynamics.

Explanation:

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a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements