question: What sentence would provide a factual answer to this question: "What does water taste like after a substance is dissolved in it?"

answer: dissolving a substance in water causes the water to taste like that substance

question: What sentence would provide a factual answer to this question: "There is more friction the more rough a surface being touched has, so the most friction would be found in"

answer: friction occurs when two object 's surfaces move against each other

question: What sentence would provide a factual answer to this question: "Which would most rely on a coal-fire power station?"

answer:
coal is used to produce electricity by burning in coal-fire power stations