- Messages
- 51
- Reaction score
- 18
- Points
- 18
Nvm, I got the answer, thanks anyways!oh sorry.
3FeO(s) + 2Al(s) = 3Fe(s) + Al2O3(s)
We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
Click here to Donate Now (View Announcement)
Nvm, I got the answer, thanks anyways!oh sorry.
3FeO(s) + 2Al(s) = 3Fe(s) + Al2O3(s)
Prop-2-en-1-ol:Which reagent would react with prop-2-en-1-ol to form a product that could exist as optical isomers?
Why is it bromine and not PCl5?
Right, right, ofc. I was thinking more on the lines of could form after another reaction. Now I see what was wrong, thanks!Prop-2-en-1-ol:
CH2=CHCH2OH
If you react this with PCl5, the alcohol group will be replaced by Cl:
CH2=CHCH2Cl
There is no chiral carbon in this compound.
If you react prop-2-en-1-ol with Br2 instead, the alkene group reacts:
CH2BrCHBrCH2OH
The pink carbon atom above is chiral.
This same with me too!!AOA
Please people, I need serious help with this boring subject. I've tried reading the course book twice, tried solving some topicals but still I cant seem to get more than 30/40 in MCQs ...... HELP ME PLZ. Any good way to retain all the syllabus would do the work. i'm not looking for notes. Just tell me an effective way to study this subject
30 is not bad.AOA
Please people, I need serious help with this boring subject. I've tried reading the course book twice, tried solving some topicals but still I cant seem to get more than 30/40 in MCQs ...... HELP ME PLZ. Any good way to retain all the syllabus would do the work. i'm not looking for notes. Just tell me an effective way to study this subject
Dont give a damn about others. You know what you are and u do ur level best that's it. Marks dont judge ur knowledge..30 IS bad if people expect more from you :'(
Hey guys! I wanted to ask that do you guys have any idea where I can get the sample paper of May/June 2016 for As level chem?
Its either A or C.Which pollutant, present in the exhaust fumes of an internal combustion engine, has an element in the +2 oxidation state and an odd number of electrons in one molecule of the pollutant? A) CO B ) H2S C) NO D )NO2
Ans C Please explain!
I understand.30 IS bad if people expect more from you :'(
Moles of thiosulphate ions = 19.5 x 0.02 / 1000 = 0.00039mol
ThanksMoles of thiosulphate ions = 19.5 x 0.02 / 1000 = 0.00039mol
This is equal to moles of copper ions:
Moles of copper ions = 0.00039mol
Concentration of copper ions = 0.00039mol / 50 * 1000 = 0.0078mol/dm^3
This is concentration in moles per volume. Let's convert it to mass per volume:
0.0078mol/dm3 of copper ions = 0.0078*63.5 = 0.4953g/dm3
So there is 0.4953g of copper dissolved in every 1000cm3 of water.
We need to find percentage of copper by mass. Note that 1000cm3 of water has 1000g of mass.
Percentage by mass = 0.4953g / (1000 + 0.4953)g x 100% = 0.05%
Okay, thanks!Its either A or C.
A has 14 electrons
C has 15 electrons
If you check the threshold grades 32-33 is already an A (Depends on how hard the paper is) Just a couple of grades man! GO FOR IT!AOA
Please people, I need serious help with this boring subject. I've tried reading the course book twice, tried solving some topicals but still I cant seem to get more than 30/40 in MCQs ...... HELP ME PLZ. Any good way to retain all the syllabus would do the work. i'm not looking for notes. Just tell me an effective way to study this subject
Heyy! Can you please explain how to do this?There is a simple concept behind them. Why not post a question?
For almost 10 years, the site XtremePapers has been trying very hard to serve its users.
However, we are now struggling to cover its operational costs due to unforeseen circumstances. If we helped you in any way, kindly contribute and be the part of this effort. No act of kindness, no matter how small, is ever wasted.
Click here to Donate Now