Given a scientific question, generate a correct answer to it.

Ex Input:
What is the mass of one mole of any given substance?

Ex Output:
molar mass

Ex Input:
What works by providing a lower energy pathway from reactants to products?

Ex Output:
catalyst

Ex Input:
Many ionic compounds with relatively large cations and a 1:1 cation:anion ratio have this structure, which is called the what?

Ex Output:
cesium chloride structure