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
1cii)
No of mole=mass/molar mass
=1.11/40+(35.5x2)
=1.11/111
=0.01moles/dmcube
20.0g dissolves 0.001moles
Then 1000g dissolves 1000x0.01/20
Solubility=0.05mol/dmcube
====================
3ai)
Crystallisation is a separation technique that is used to separate. 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
===================
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.
Answers Loading.... 85%
A giant ribbon will not hang in front of the White House. No marches
will be held. The lights on the Empire State building will not shine a
special color. Instead, March 24th - World TB Day-is just like most
any other day. Little attention will be paid to the fact that
tuberculosis is now the number one infectious disease killer in the
world.
TB has long been the stepchild of the three major global health
diseases - AIDS, TB and malaria. A major reason why is that TB
primarily impacts people living in poverty, those who are voiceless or
whose voices are simply ignored. It is ironic that a curable disease
remains a disease fighting to gain attention.
It is also ironic that at a time when Ebola and Zika have put our
nation on notice about serious health threats, the same concern is not
given to TB, which can spread like wildfire just by coughing. We need
to look no further than Marion, Alabama to see how quickly TB can
overwhelm a city. TB in Marion is now worsethan in man...
Comments
Post a Comment