CHEM 1021 Study Guide - Comprehensive Final Guide: Conversion Of Units, Acid Strength, Transition Metal
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1. hg is called quicksilver and is mostly obtained by reduction from the mineral cinnabar. 2. many window companies now us kr to fill sealed panes in order to reduce energy waste, and the gas can also be used to detect leaks in industrial sealed containers. 3. iron is one of the most plentiful elements. It comprises about 5. 6% of the earth"s crust and almost all of the earth"s core. 4. approximately 2/3 of the mass of the human body is oxygen. 5. calcium is essential for animal and plant nutrition. Calcium participates in many biochemical reactions, including building skeletal systems and moderating muscle action. Made of two or more elements chemically combined. Formulas for compounds: write the symbols of all elements in the compound. H, o: write subscripts of indicate the # of the atoms of each element. Composition - amounts of each pure substance can change o. Pure substances can only be broken down by a chemical.
