TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: A(n) an ionic bond forms when the metal sodium gives up an electron to the nonmetal chlorine.

SOLUTION: What forms when the metal sodium gives up an electron to the nonmetal chlorine?

PROBLEM: Hemodialysis has a patient’s blood pass through a length of tubing that travels through an artificial kidney machine.

SOLUTION: Which form of dialysis has a patient’s blood pass through a length of tubing that travels through an artificial kidney machine?

PROBLEM: Most people can survive only a few days without water.

SOLUTION:
Most people can survive only a few days without what essential substance?