General Chemistry Questions & Answers
General Chemistry Questions & Answers Acid Dissociation Constant, K(a) - CORRECT ANSWER - Equilibrium constant for an acid in water. HA + H2O -- A- + (H3O)+ K(a) = [H3O+][A-]/[HA] Acid Strength of Molecular Structure - CORRECT ANSWER - Molecular structure determines whether or not a molecule will release its hydrogen into solution with three factors: 1) Strength of the bond holding the H onto the molecule. 2) Polarity of the bond. 3) Satbility of the conjugate base. Hydrogen halide acids (order of increasing acidity): HF, HCl, HBr, HI Oxyacids: more oxygen atoms means more acidic (resonance of conjugate base, higher oxidation number of central atom). Alkali Metal - CORRECT ANSWER - Group 1A elements, except hydrogen, that are on the left side of the modern periodic table. Think: alkali comes first in the alphabet and is the first group (compared to alkaline). Alkaline Earth Metal - CORRECT ANSWER - Group 2A elements in the modern periodic table. Think: alkali comes first in the alphabet and is the first group (compared to alkaline). Amphoteric - CORRECT ANSWER - A substance that can act as either an acid or a base depending on the environment (pH). In neutral solution, has *net neutral charge. Ex: water Amplitude - CORRECT ANSWER - The height of a wave from the origin to a crest, or from the origin to a trough.
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