Which of the statement below states the negative impact did chemistry have on society through the production and use of chlorofluorocarbons (cfcs)? a. hazardous coolants in refrigeration units were replaced. b. better refrigeration reduced loss of food through spoilage. c. lower levels of ozone allowed more ultraviolet radiation to reach earth. d. fire safety improved through the use of fire extinguishers.

What does a complete balanced chemical equation include? a. exothermic coefficients b. endothermic coefficients c. valence electrons d. molar coefficients

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.