CHEM 2070 Chapter Notes - Chapter 3: Lanthanide, Plus And Minus Signs, Krypton
Document Summary
Chem 2070 chapter 3 the periodic table and chemical periodicity. Left to right arrow separates reactants from products. A chemical equation must be balanced: law of conservation of mass. Individual atoms of various types are neither created nor destroyed: balanced chemical equation. Number of each type of atom remains the same in a chemical reaction. Balancing by inspection: adjust coefficients of chemical formulas on each side of the arrow. Balancing chemical equations algebraically: set variable relationships, ana + bh2o cnaoh + dh2, a=c, 2b=c + 2d, b=c, set a=1 (or any value, solve and substitute back into equation, make coefficients whole numbers. Elements can be grouped according to chemical properties: alkali metals. Lithium, sodium, and potassium have similar chemical properties=group. Hydroxides of these metals are alkaline: form corrosive aqueous solutions that feel slippery and react with acids, react with acids, alkali-earth metals. Magnesium, calcium, strontium, and barium have common chemical properties. Compounds occur in alkaline soil deposits: halogens.