Liquid ammonia boils at –33.4ºc and has a heat of vaporization of 23.5 kj/mol. what is its vapor pressure at –50.0ºc? (r = 8.314 j/k•mol)

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 will most likely happen when two bromine atoms bond together?

What will most likely happen in the absence of a cell membrane? a) photosynthesis will not take place. b) the cell will not store food, water, nutrients, and waste. c) energy will not be released during cellular respiration. d) substances will pass in and out of the cell in an uncontrolled manner.