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# If the isotope of nickel z 28 whose mass number a is

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If the isotope of nickel ( Z = 28) whose mass number ( A ) is 58 forms a Ni 2+ ion, the ion has the following composition of protons ( p ), neutrons ( n ), and electrons ( e ): 28 p , 58 n , 26 e 28 p , 58 n , 30 e 28 p , 30 n , 28 e 28 p , 30 n , 26 e 28 p , 30 n , 30 e g. Is a strong electrolyte in water Hg 2 Cl 2 CH 3 CO 2 H SiO 2 HNO 2 C 12 H 22 O 11 h. What is the energy in Joules of a photon whose wavelength is 525 nm? ( h = 6.64 x 10 –34 J @ s; c = 3.00 x 10 8 m·s –1 ) 3.79 x 10 –19 J 1.99 x 10 –25 J 1.26 x 10 –27 J 3.79 x 10 –28 J 1.05 x 10 –31 J

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Page 3 of 11 H C H H O C H H H α Cl O O O O _ H C O O H S O O O H C N H C H C H H Name_______________________________ i. Complete and balance the following skeletal equation with lowest whole number coefficients : C 6 H 5 CO 2 H( l ) + O 2 ( g ) 6 CO 2 ( g ) + H 2 O( l ) The coefficient for O 2 ( g ) is 17 15 30 34 7 j. Consider the following Lewis model. Which of the following best describes the size of the angle marked α ? ~90 o ~109.5 o ~120 o ~180 o exactly 180 o k. Which molecule or ion among the following has a delocalized π system (only central atom electrons shown)? l. Judging from trends in electronegativity, which one of the following bonds is most polar Sn-Cl C-N N-N S-O S-Br m. Consider :N / N:, diatomic nitrogen. In terms of valence bond theory, the nitrogen-nitrogen bond could be described as σ only π only σ + π σ + π + π ionic n. Among the following, the species that has a positive value of electron affinity, A , for acquiring one additional electron Cl O C N I
Page 4 of 11 Name_______________________________ o. Among the following, which result definitely has two significant figures? 7.51 + 5.6 98.3 – 96.37 54.6/6.00 12.5 × 4 500/25 p. The following indicate transitions between two n states of the hydrogen atom. Which one would result in emission of visible light?

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