In a science project I’m doing, I’m putting a powder on peoples hands and seeing if a warning changes the amount of powder spread. What would be the variables in this project? Please help me lol, thank you!(i had no idea what category this goes in)

What is the force of attraction between the particles in a salt crystal

An atom of lithium (li) and an atom of chlorine (cl) engage in a chemical reaction. which correctly describes the structure of the resulting chemical compound? hint: consider the class of each element. the chemical compound will have a network structure. the chemical compound will have triple bonds. the chemical compound will have a ball-and-stick structure. the chemical compound will have double bonds.

Classify this reaction: 2al+n2-> aln.