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Atomic Structure test& Redox Titration
Yeah,had chem test yesterday.Really hope i could pass this one..(well,since ive been failing countless of times due to MOLE! Grrr...) But maybe i did one or two screw ups...hope it wasnt that bad.Oh,ill just pray for the better ya *prays >.<*
Had SPA last period.Did redox titration which we use potassium manganate (vi) (izzit? oO) Well,cant remmber wad number..had a hard time doing,and we had insufficient time to complete mayb the 2nd trial and also not forgetting VA5! Gah...which we had to do like overnight and hand in the next morning (was struggling there,ok not really xP) and not to mention my skirt got the potassium stain =.= *sigh* and my mum had a hard time removing it,but at the end the stain is still there..LOL.Well,guess it shall be my remembrance of the redox titration ya xD
Anyhow,tomorrow will be having chem lesson so,ill update on the class then..x3
Saturday, April 25, 2009 @ 8:15 AM
Redox Reactions
What ive learnt would be how to identify the oxidation states.I used to be really bad at this or maybe i just forgot how to find it,heh.But i manage to get a gist about the topic.Hopefully,i will be able to catch it too.Ive learnt how to calculate the oxidation number with certain steps to guide me.
The downside,ive been failing my chem test =.= (i bet Mrs Pua is soo gonna kill me *sigh*) Well,IM REALLY BAD AT MOLE! Like since the secondary school..and ive been bragging about this from the star of chem lesson,when our first topic is...MOLE! argh! But,i shall not loose hope..im trying to practise more mole questions,but it seemed a lilttle hard considereing all my other subjects and also catching up on certain topics which i am unfamiliar of..Oh well,i shall do the best of my ability! GO ME GO!
Friday, April 24, 2009 @ 5:36 PM
Chemical Bonding
Ive learnt a new topic which is chemical bonding. There are 3 types of bond, metallic bonding,ionic bonding and covalent bonding.
Metallic bond is the force of attraction between the positive metal ions and the negative delocalised electrons.Also the bond is non-directional and it is strong too.Metals have high degree of electrical conductivity,high thermal conductivity,high melthing and boiling point,shiny,insoluble in water,malleable also can form alloys with other elements.
Ionic bonds are formed when electrons are trasferred from the balence shell of atoms of one element to other atoms.It is an electrostatic attraction between the positive ions (cations) and negative (anions).Its between a metal and non-metal.Is is non-directional and strong.
Covalent bond is the electrostatic force of attraction between the nuclei of each atom for the shared pair of electrons.There is the sigma and pi bond.
Also from these bonds,ive learnt that the way to draw out the electrons for the 'dot and cross' diagram,is slightly different from secondary school.This is also something which,we all need to adapt too xD