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Descripción: Chemistry GRE Sample
Chemistry GRE Sample
UP 2
1 EXERCISE 1.
Table below show show s the pr oton num bers and neutron num bers of a few few elem elem ents w hich are r epr ese esent nt ed by t he lett ers U,V, U,V,W W ,X,Y X,Y and and Z. N u m b e r o f P r o t on on Num ber of Neutron Electron Element per atom per atom Arrangement U 3 4 V
5
6
W
8
8
X
9
10
Y
12
12
Z
17
20
a) b) c) d) e) 2.
Comp lete lete table by w rit ing the electron electron arrangem arrangem ents of all all th e particles. particles. W hat is the nucleon nucleon num ber of U? W hat is the num ber of valence valence elec electr tr ons in ion U + ? State the num ber of electr electr on shells in p arti cle Y. Draw the electron electron arrangem arrangem ents of particle Z and and ion W 2 - , r especti especti vely.
a) b)
W hat is m eant eant by isotope? isotope? Chlor ine-35 and chlorin e-37 e-37 is a pair of isotopes. i) State tw o similar iti es betw een een these isotopes. ii) State the differ ence betw een een these isotopes. c) Hyd r oge ogenn has thr ee isotopes. i) Name the thr ee isotopes isotopes of hydr oge ogen. n. ii) Give th e sym bols of the isotopes nam ed in c(i). d) Table below show s the isotopes and their use usess in daily life. Com plete Table below . Isotopes Use of Isotopes in Dail y Life Cobolt-60 i)
ii)
To detect detect clott clott ing of blood in body
iii)
To determ ine the rate of abs absorp orp tion of fertilizers by the plants
