11) Which of the following is an isoelectronic series? A) 02-, F, Ne, Na+ B) S, a, Ar, K E) Si2-, P2-, 52-, C2- D) F, CI, Br, I- O B5, Sit, As3, Te2- 12) The Lewis structure of N2H2 shows A) each nitrogen has two nonbonding electron pairs C)a nitrogen-nitrogen single bond E) each nitrogen has one nonbonding electron pair B) each hydrogen has one nonbonding electron pair D) a nitrogen-nitrogen triple bond 13) Of the bonds C-C, C-C, and CC, the C-C bond is A) weakest/shortest D) intermediate in both strength and length B) strongest/shortest E) weakest/longest 14) How many equivalent resonance structures can be drawn for the molecule of SO3 without having to violate the octet strongest/longest rule on the sulfur atom? A) 3 B) 2 C)1 D) 5 E) 4 15) Given the electronegativities below, which covalent single bond is most polar? Element: H N Electronegativity: 2.1 2.5 3.0 3.5 A) O-C B) 0-H C)0-N D) C-H E) N-H 16) The ground-state electron configuration of the element is [Kr]5s14d5. A) Nb B) Tc D) Mn E) Mo 17) The F-B-F bond angle in the BF2" ion is approximately A) 90° B) 109.5° C) 120° D) 180° E) 60° 18) There are o and n bond(s) in the H2C-CH2 molecule. B) 5 and 1 C) 3 and 2 D) 2 and 3 E) 4 and 3 A) 3 and 4
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
general chemistry , please solve question 5
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