am I the only who gets confused with the reactions for pollution and removing pollution?? Does anyone mind putting up the equations we are supposed to know?
look at the jumps and count the number of electrons removed before the first jump. this will tell you the group number
e.g. period 2 element with successive ionisation energies of 1203 2304 3046 6078 the jump occurs after the third electron is removed, so it is in group 3 period 2, therefore it is Boron.
THANK YOU SO SO MUCH!!! I finally understand it you've saved my life
am I the only who gets confused with the reactions for pollution and removing pollution?? Does anyone mind putting up the equations we are supposed to know?
The ones that i know: 2CO + 2N0 ---> N2 + 2CO2 CaO/CaCO3 is used to remove SO2 as its basic and SO2 is acidic when dissolved. There is a third one about using hydrocarbons but i dont get it so im leaving it out
Can someone tell me what the shape of AsCl4+ would be? how many bp and lp's ?
the way i do it: As is in group 5 and has 4 Cl's attached=5+4=9 minus 1 for plus=8 so the shape is tetrahedral. If it was a munus sign, you'd add one...if that makes sense?
Can someone tell me what the shape of AsCl4+ would be? how many bp and lp's ?
I'm not good at this topic but I'll try . So As has 5 electrons on its outer shell.and there are 4 electrons from 4 Chlorines.[one provided by 1 chlorine].since there's a + charge that means As has lost one electron so now has 4 in total .4 electrons on As + 4 electrons from the Chlorines = 8 electrons .we divide 8/2 = 4 to find the number of bonding pairs of electrons present.There are 4 bonding pairs and no lone pairs because there are 4 pairs of electrons .Remember 4 bonding pairs form a tetrahedral shape with bond angles of 109.5 .hope I helped I did the same question this afternoon
atomic radius across a period: decreases. increased nuclear charge meaning stronger nuclear attraction. Shielding remains the same. (so due to the increased nuclear attraction, electrons are pulled in closer towards the nucleus, so the size decreases)
atomic radius down a group: increases. increased shielding so electrons are further away from the nucleus meaning a weaker nuclear attraction
ionisation energy down a group: decreases. Increased shielding so electrons are further away from the nucleas meaning a weaker nuclear attraction (Which makes the outer electron more easier to remove)
ionisation energy across a period: increases. Increased nuclear charge meaning stronger nuclear attraction. Same Shielding.
note: ionisation energy across a period can decrease for certain elements. for example, if an element enters a higher energy level, there the outer electron is further away from the nucleas as has more shielding (so is easier to remove) so, Be with electronic structure of 1s2 2s2 and B with electron structure 1st 2s2 2p1. ionisation energy decreases for B, as it is easier to remove. (see above explanation)
finally, ionisation energy can also decrease across a period due to electrons pairing. For example, electronic structure of N: 1s2 2s2 2p3 and of O: 1s2 2s2 2p4 electron in the 2p orbital has paired, meaning there is repulsion
hope this helped...
This actually cleared a few things for me aswell Thanks!!
haven't revised since Easter...cramming like crazy oh ****...i got a U in Jan now retaking if I get a U I won't be surprised...hate chemistry with a passion.
haven't revised since Easter...cramming like crazy oh ****...i got a U in Jan now retaking if I get a U I won't be surprised...hate chemistry with a passion.
if you want, you can watch videos, although might take 2 hours maybe... youtube - newcastle chemistry
if you want, you can watch videos, although might take 2 hours maybe...<br /> youtube - newcastle chemistry
<br /> <br /> thanks that's what I have been doing, watching loads of YouTube videos and its half one in the morning and surprisingly im.not sleepy..still Gunna wake up at six so I need to sleep. I am not worried about the exam since I am so horrificly bad at chem there is no hope... Good luck to everyone miracles..