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: Diamond, graphite and fullerene are examples of what form of carbon? Answer: crystalline
answer:
Pure carbon can form different types of crystals. Crystalline forms of carbon include diamond, graphite, and fullerenes.

question:
Question: What are mass, volume, and length an example of? Answer: extensive properties
answer:
Extensive properties vary according to the amount of matter present. Examples of extensive properties include mass, volume, and length.