How many seismograph stations are needed to use the S-P-method? Why?

Acetic acid, hc2h3o2, dissolves and completely dissociates in water and a solvation sphere of water molecules forms around the ions. this solute-solvent interaction

The compound methyl butanoate smells like apples. its percent composition is 58.8% c, 9.9% h, and 31.4% o. what’s the empirical formula ?

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.