Question

multiple-choice question
what is the first law of thermodynamics?
energy cannot be created or destroyed
elements cannot be created or destroyed
for every reaction there is an equal and opposite reaction
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Explanation:

The first law of thermodynamics (also known as the law of energy conservation) states that energy cannot be created or destroyed, only transformed or transferred. The option "Elements cannot be created or destroyed" relates to chemical conservation laws (not thermodynamics), and "For every reaction there is an equal and opposite reaction" is Newton's third law (not thermodynamics). So the correct option is the one about energy conservation.

Answer:

A. Energy cannot be created or destroyed (assuming the first option is labeled A; if no labels, identify as the first option: "Energy cannot be created or destroyed")