General Chemistry Questions & Answers

General Chemistry Questions & Answers (first) ionization energy - CORRECT ANSWER - amount of energy necessary to remove the least tightly bound electron from an isolated atom ∆G - CORRECT ANSWER - changes with changing reaction composition until it reaches zero ∆Gº - CORRECT ANSWER - describes a reaction at on especific temperature,pressure, and set of concentrations a catalyst - CORRECT ANSWER - make a reaction go faster by either speeding up the ratedetermining step or providing an optimized route to products a catalyst remains _______ at the end of a reaction - CORRECT ANSWER - unchanged a double bond has how many sigma and pi bonds - CORRECT ANSWER - 1 sigma, 1 pi abscissa - CORRECT ANSWER - the x-coordinate of an ordered pair according to the first law what can be done to ncrease a systems overaqll energy - CORRECT ANSWER - put in work according to the henderson-hasselbalch equation the pKa of HF equal the _________ at the halfequivalence point - CORRECT ANSWER - pH acid-base equivalence point - CORRECT ANSWER - point during the drastic pH increases at which just enough NaOH has been added to completely neutralize all the HF acid-base titration - CORRECT ANSWER - experimental technique used to determine the identity of an unknown weak acid (or weak base) by determining its pKa (or pKb) acid-ionization (acid-dissociation) constant (Ka) - CORRECT ANSWER - acid-dissociation reaction acidity - CORRECT ANSWER - measure of how well a compound donates protons, accepts electrons, or lower pH in a chemical system acidity down a group - CORRECT ANSWER - increases acidity from left to right across a period - CORRECT ANSWER - increases activation energy (Ea) - CORRECT ANSWER - minimum energy required of reactant molecules during a molecular collision for the reaction to proceed to products alkali metals and alkaline earth metals characteristics - CORRECT ANSWER - reducing agents (lose valence electrons) in redox reactions to obtain a stable octet alloy - CORRECT ANSWER - solution of a solid in a solid alpha decay - CORRECT ANSWER - reduced parent's atomic number by 2 and the mass number by 4 alpha particle - CORRECT ANSWER - emitted when a large nucleus wants to become more stable by reducuing the number of protons and neutrons; 2 protons and 2 neutrons amount of heat required to change a phase depends on what two things - CORRECT ANSWER - 1`. the type of substance 2. amount of substance amphoteric - CORRECT ANSWER - can act as either an acid or a base