Which occurs when two fluorine atoms react to produce a fluorine molecule?
(1) energy is absorbed as a bond is broken.
(2) energy is absorbed as a bond is formed.
(3) energy is released as a bond is broken.
(4) energy is released as a bond is formed.

Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397

The three types is stress that act on earths rocks are compression, tension, and