1. Element X has two isotopes. The first isotope has a natural abundance of 80% and has a mass of 60 amu. The second isotope has a natural abundance of 20% and has a mass of 64 amu. Is the average mass going to be closer to 60 or 64 amu and why? The

Why do scientists look for patterns in the world? a. patterns can explain observations. b. patterns never change, no matter what. c. patterns are easy for scientists to detect. d. patterns are all the same, through all time.

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

Liquid ammonia is produced at high temperatures and under great pressure in a tank by passing a mixture of nitrogen gas and hydrogen gas over an iron catalyst. the reaction is represented by the following equation. n2(g) + 3h2(g) → 2nh3(g) changing all but one experimental condition will affect the amount of ammonia produced. that condition is a) increasing the concentration of both reactants b) changing the temperature within the tank c) decreasing the pressure within the tank. d) increasing only the amount of nitrogen present.