CHEM AND BIO HELP AND TIPS HERE

[Zephyrs]

how does electrostatic dust precipitator removes charged particles from sulphur dioxide 
thanz

Long time lurker here.

An electrostatis dust percipitator works to remove smoke and another dust particles from gas exhaust from factories. It passes the exhaust through a mesh that is positivly/negatively charged, causing the dust particles to become "ditto" charged. The gas is then passed through a pipe with opposite charged walls.

As the dust is charged, and opposites attract, the dust is attracted to the walls.

As far as I remember, that's all we need to know.

[Raywin]

Okay, I'll start with i)
a)
i)D   :2,8,18,8 - stable

ii)E   :2,8,18,8,1 - Group-I metal, one of the property:low density

iii) Covalent means two non-metals..so select only non-metals from the table..(except A) B- 2,8,4 and F 2,8,18,18,7

try to bond A with both of them (by drawing the atomic structure)
It is not possible with B, so it has to be F

OR if you want to be sure of your answer draw the bonding between A and F, gives you AF₃

iv)its B, always giant covalent structure of diamond has 4 electrons in the valence shell(outermost shell). Hence B
Revise Structure of diamond

v) A

Oh thx a lot..

[NidZ- Hero]

Long time lurker here.

An electrostatis dust percipitator works to remove smoke and another dust particles from gas exhaust from factories. It passes the exhaust through a mesh that is positivly/negatively charged, causing the dust particles to become "ditto" charged. The gas is then passed through a pipe with opposite charged walls.

As the dust is charged, and opposites attract, the dust is attracted to the walls.

As far as I remember, that's all we need to know.

thanz  alot Zephyrs

[The Golden Girl =D]

y'all i need advice on the following:

what is the best way to study chem paper 3 ? ...............

i believe i should do some past paper and should mostly focus on memorizing the syllabus


plz anwer ASAP

[elemis]

DO past papers THEN read your textbook.

[The Golden Girl =D]

DO past papers THEN read your textbook.

ok thx

[JD46]

HEy guys ,i'm really in trouble, the problem is that my chemistry guide(bob berry) is missing an important page(Pg 33 to 34) ,about excess reagents and  coincidentally ,i always mess up that question and lose marks,so could someone  scan the page off the guide and post it,or even a picture  would do, i'm sure you''ll wil understand ,thanks!   

[omair]

guys do u have any small notes for stoichiometry

[Vin]

guys do u have any small notes for stoichiometry

See if this topic has some ...

[aangel42]

When does ovulation occur in a female (like which day of the menstrual cycle)?

[Vin]

When does ovulation occur in a female (like which day of the menstrual cycle)?

after 14 days

[WARRIOR]

http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2009%20Jun/0620_s09_qp_3.pdf

questio 5 (b)

[Ivo]

http://www.freeexampapers.us/IGCSE/Chemistry/CIE/2009%20Jun/0620_s09_qp_3.pdf

questio 5 (b)

This has been answered before.

no problem..
anyways

the vol. of phosphate soln used in cm3 is half the height of the ppt in mm
also at 8cm3 all the soln is used up. tht is because adding more does not increase the height of the ppt meaning there was no further reaction on adding more.
also the formula is T3(PO4)2-----because

u take it as 12cm3 of T nitrate react with 8cm3 of sodium phosphate (thts wen all the reactants r used up)
so.....12:8...simplify it
12:8
6:4
3:2
and therefore u get T3(PO4)2

[Vin]

Okay one silly question about the same, how does it matter if the "the vol. of phosphate soln used in cm3 is half the height of the ppt in mm"?

[Ivo]

Okay one silly question about the same, how does it matter if the "the vol. of phosphate soln used in cm3 is half the height of the ppt in mm"?

How do you mean by "half the height", the question didn't ask it, right?