instruction:
Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.
question:
Question: The voltage of a voltaic cell can be determined by the reduction potentials of what? Answer: half reactions
answer:
The voltage of a voltaic cell can be determined by the reduction potentials of the half reactions.

question:
Question: What kind of reaction is needed to prepare amides? Answer: carboxylic acid reaction
answer:
Amides are prepared by the reaction of a carboxylic acid with ammonia or an amine.

question:
Question: The high points of a transverse wave are called what? Answer: crests
answer:
The high points of a transverse wave are called crests, and the low points are called troughs.