[exercise] ESSAY SECTION B ;D goodluck

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[exercise] ESSAY SECTION B ;D goodluck

Post by fatin pauzi on Tue Sep 07, 2010 12:36 pm

hey, cuti tu, cuti gak... jgn lupe bce bku CHEM. ;D
jom try jwb soklan neyhh. ;DD




ELEMENT
NUCLEON NUMBER
PROTON NUMBER
X
24
12
Y
12
6
Z
16
8

FIGURE 1

Based on figure 2, answer the following questions :
a) i- write the electron arrangement of ATOMS X and Z [2m]
ii- write the number of neutrons in element Y & the symbol of an isotope of element Y[4m]
b) an ionic compound is formed when X reacts with Z but a covalent bond is formed between Y and Z. explain how these ionic and covalent compound are formed. [14m]
selamat menjawab ~

ANSWER SCHEME
pls b reminded to attempt the question by urself first b4 u take a look at the answer scheme. TQ
a) i- X : 2.8.2 Z: 2.6
ii- number of neutrons = 12 - 6 = 6
b)


  • to achieve the stable octet electron arrangement of a duplet or an octet electron arrangement [1]
  • Atom X will release 2 electrons to form X 2+ ion to achieve stable electron arrangement [1] Z + 2e- -> Z2-
  • the two electrons will be accepted by Z atom to form an Z2- ion [1] X -> X2+ + 2e-
  • the positive & negative ions are attracted togeteher by strong electrostatic force, which is called as ionic bond [1]


  • Atom Y has 4 valance electrons; Atom Z has 6 valence electrons [1]

  • Atom Z needs 2 electrons meanwhile atom Y needs 4 electrons to achieve stable electron arrangement [1]
  • Atom Z contributes 2 electrons for sharing while atom Y contributes 4 electrons for sharing
  • two Z atoms each will share their 4 valence electrons with 4 valence electrons in one atom Y 2 pairs of electron with one atom Y [1]
  • a double covalent bond formed between Y and Z [1]
  • A molecule with the formula YZ2 is formed



  • the ionic compound is formed between X and Z is melted. two carbon electrodes are placed in solution XZ [2]
  • when the switch is on, a reading on the ammeter is observed to show that it conducts electricity [1]
  • when ionic compounds are molten or dissolve in water, the ions of the compounds can move about. the moving ions carry the electrical current. in the solid state, the ions cannot move, so the current cannot flow [2]




hope u guys are satisfied wif this answer scheme. ;DD
chem A+.





lots.of.love,
chem department


Last edited by Admin on Tue Sep 07, 2010 4:36 pm; edited 1 time in total (Reason for editing : Good Effort!)
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obtain completely Taxi 12s

Post by coco23 on Wed May 21, 2014 11:25 am

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Carmine 6s Bondi

Post by coco23 on Thu May 22, 2014 11:14 am

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