GCE CHEMISTRY 2016 FREE ANSWERS HERE!!

CHEMISTRY OBJ:

1-10: ADCCADAADA

11-20: DCCBADDBCC

21-30: CBAACDDDAB

31-40: CACCBDDADB

41-50: ADBCDADBBA

1a the raw materials for the manufacture of synthetic
polymeters are readilyand cheaply available from
reftining of crude oil
-
1d)I)The transition elements are those elements having a
partially filled d or f subshell in any common oxidation
1d)ii)trasiction element have variable oxidation states
because they do not have incomplete filled D-orbitals
1d)iii)-for conducting electricity
 -for making malleable instruments
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3ai)
Crystallisation is a separation technique that is used toseparate. a solid that has dissolved in a liquid and made
a solution. The solution is warmed in an open container,
allowing the solvent to evaporate, leaving a saturated
solution.
3aii)
Evaporation is the process of a
substance in a liquid state changing to a
gaseous state due to an increase in temperature and/or
pressure.
3aiii)
Filtration is any of various mechanical, physical or
biological operations that separate solids from fluids
(liquids or gases) by adding a medium through which
only the fluid can pass.
3bi)
i)Their Melting and Boiling Points increases down the
group
ii)Their atomic Radius increases down the group
iii)Their Ionization Energy: decreases down the group
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(3bii)
4NaOH(aq)+2F2(aq)->4NaF(aq)+O2(g)+2H2O(l)
Cl2(g)+2NaOH(aq)->NaOCl(aq)+NaCl(aq)+NaCl
(aq)+H2O(l)
(3ci)
Gas is a state of matter while vapour is the
gaseous state of substance in equilibrium with
its liquid or solid state
(3cii)
Normal temperature and pressure
(3di)
Mg(s)+Cl2(g)->MgCl2(s)
(3dii)
n=mass/molarmass
n=24/35.5
n=1.2/24
n=0.05
number of moles=volume used/molar volume
0.05=V/22.4
V=1.12dm^3
(3e)
-Atomic number is the number of protons
present in an atomic nucleus of the element
-Mass number of an element is the sum of the
protons and neutrons in the atomic nucleus of
the element
3f)
diagrams
( k )** ( k )** ( 2) ( k )** ( k )**
3g)
because it attains equilibrium at very fast ratet

4a)I)HARD WATER:They will not form latter readily with
soap.it contains a number of dissolved salts.
Ii)Temporary hardness:Ca(OH)2
 Permanent hardness:NaS03
Iii)By using chemicals like caustiic soda. -By using
permutot OR zeolite
4b)I)-coagulation/flocculation
 -sedimentation
 -filtration
 -chlorination/disinfection
4b)ii)-potash alum
 -iodine
 -fluorine
4c)Solubility is the property
of a solid, liquid, or
gaseous chemical
substance called solute to
dissolve in a solid, liquid,
or gaseous solvent.

5ai) The sodium is oxidized, and the fluorine is
reduced. Redox (short for reduction– oxidation
reaction) is a chemical reaction in which the
oxidation states of atoms are changed through
the transfer of electrons between chemical
species, involving both oxidation and a
complementary reduction process .

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Tuesday, 20th September, 2016
Chemistry (obj and essay) 9.30am
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