Chemistry Salters F332 june 2010

najeezy

alcohol - alkene = Al(2)0(3), 300 degrees, 1 atm.

where Al2O3 is the catalyst, and 300 degrees 1 atm is temp and pressure right?

Reply 263

if you get a question where you're given the concentration (in moldm^3) and volume in cm^3, do you multiply them then divide by 1000 to get moles?

or do you divide by 1000 when you are given volume in dm^3?

Reply 264

najeezy

12

najeezy

alcohol - alkene = Al(2)0(3), 300 degrees, 1 atm.

lastly alkene to alcohol = alkene + H(2)0, conditions/reagents = H(3)PO(4), 300 degrees also 60 atm.

Reply 265

najeezy

12

bla_bla_bla_blaa

where Al2O3 is the catalyst, and 300 degrees 1 atm is temp and pressure right?

mhmm.

Reply 266

rainbowsss

2

do you always convert grams to kg ?
and so c-f shortest bond = strongest. longer bonds down group, bond enthalpy of c-hals decreases down group with larger atom?

Reply 267

Jamesrb

rainbowsss

do you always convert grams to kg ?
and so c-f shortest bond = strongest. longer bonds down group, bond enthalpy of c-hals decreases down group with larger atom?

You convert KG to grams.

Reply 268

electronegativity is the ability to attract bonding electrons from an atom

true or false? correct answer wins a rep worth nothnig

Reply 269

Jamesrb

bla_bla_bla_blaa

electronegativity is the ability to attract bonding electrons from an atom

true or false? correct answer wins a rep worth nothnig

Electronegativity is the degree to which an atom attracts electrons.

Fluorine attracts more of the electron cloud, and so is more electronegative and will have a partial negative charge.

Reply 270

Jamesrb

Electronegativity is the degree to which an atom attracts electrons.

Fluorine attracts more of the electron cloud, and so is more electronegative and will have a partial negative charge.

thanks..

teaching is learning guys so help me to help you..

why are chlorine radicals not produced from the break down chloromethane molecules in the trophosphere (whatever the hell that is)

Reply 271

if you get a question where you're given the concentration (in moldm^3) and volume in cm^3, do you multiply them then divide by 1000 to get moles?

or do you divide by 1000 when you are given volume in dm^3?

Reply 272

bla_bla_bla_blaa

if you get a question where you're given the concentration (in moldm^3) and volume in cm^3, do you multiply them then divide by 1000 to get moles?

or do you divide by 1000 when you are given volume in dm^3?

You always work out titrations in dm^3. 1000cm=1dm

Reply 273

Dukedom

No you dont all the guides say to do it in cm3

Reply 274

bla_bla_bla_blaa

thanks..

teaching is learning guys so help me to help you..

why are chlorine radicals not produced from the break down chloromethane molecules in the trophosphere (whatever the hell that is)

If they are broken down they are. However things are rarely broken down in the troposphere - most of the high frequency solar radiation required to break down the halogenoalkane has been absorbed by the ozone layer in the stratosphere (the stratosphere is above the troposhere).

Reply 275

Moe Lester

You always work out titrations in dm^3. 1000cm=1dm

ite..

and how many electrons does sodium have in its outershell

rofl jk man relax

Reply 276

Dukedom

No you dont all the guides say to do it in cm3

No, you convert to dm^3. The concentration is given as mol dm-3 or g dm-3, at some point you have to convert to dm.

Reply 277

bla_bla_bla_blaa

ite..

and how many electrons does sodium have in its outershell

rofl jk man relax

Relax? Why are you asking questions if you don't want them answered?

Reply 278

rainbowsss

2

Lower frequency of radiation and therefore energy in the troposphere... God knows why ! Any help here... haha

Are the following 2 statements true :

1) Ionisation enthalpy decreases down the group, and therefore reactivity increases

2) Methane is useful in the stratopshere as it removes chlorine radicals which cause depletion of ozone. Howere in the troposphere it is less useful as ozone is harmful in the troposphere and therefore we want it to be removed form Cl radicals, but the methane causes them to dissappear.

Sorry that was worded terribly :P

Also does anyone know how to draw a NO or NO2 radical :O :s-smilie:

? =]

Reply 279