What tests, other than visual observations, might be useful to determine if a reaction had occurred?

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.

What is the ima of the 1 st class lever in the graphic given? 2 3 0.5

Liv sheldon given the balanced equation for an organic reaction: c2h2 + 2cl2 → c2h2cl4 this reaction is best classified as *