Chemistry unit 1 6CH01 Discussion! :)

[chathumus]

In the MC i put Green towards negative terminal because i had in mind that Mno4 turns green in basic solutions :/ but most of my friends put purple color.

Some others MC answers that i remember
1)1st electron affinity of oxygen - Delta H is negative
2) 0---->o-+1e - 1st electron affinity of oxygen
3) (1/4)ch4---->C+4H
4) UV light causes cancer
5) 2-methyl But-2-ene
6) 2,3-dimethylpentane
7) Ca2+ and 02- are isoelectronic
8)Free radical substitution reaction
9)Ethane

Section B
1st question , i didnt understand the question ( it said something like an electron is emitted and a proton is formed :/ ) - I put Xenon as answer

mostly same. except i said purple moves to positive

 

[DC1313]

In the MC i put Green towards negative terminal because i had in mind that Mno4 turns green in basic solutions :/ but most of my friends put purple color.

Some others MC answers that i remember
1)1st electron affinity of oxygen - Delta H is negative
2) 0---->o-+1e - 1st electron affinity of oxygen
3) (1/4)ch4---->C+4H
4) UV light causes cancer
5) 2-methyl But-2-ene
6) 2,3-dimethylpentane
7) Ca2+ and 02- are isoelectronic
8)Free radical substitution reaction
9)Ethane

Section B
1st question , i didnt understand the question ( it said something like an electron is emitted and a proton is formed :/ ) - I put Xenon as answer

i put purple towards positive terminal
for the geometric isomers one, i put but-2-ene instead of 2methylbut-2-ene
for the isoelectronic one i dont remember well but there was an Na+ in it :/

the rest are the same

 

[chathumus]

oh

i wrote the same thing

maaann! I'm so silly i thought they were talking about the electron density map thing. Since its covalent I just drew a circle going around the two carbon bons and no pi bond whatsoever. Do you suppose they'd think my circle thing is the sigma bond gimme a mark? :/ I'm too hopeful, I know

 

[chathumus]

i wrote the same thing

kiara I saw charith and them talk about the pi bond thing and my heart sank lol. They were so happy they were dancing. So was until i realized my mistakes. what is my life I'm the only one who can successfully manage to fail a perfectly ordinary paper D:

 

[ALevel96]

For the isomer one the answer was but-2-ene! It said either cis-trans and EZ

 

[aldamon]

can you guys tell me some of the MCQs, I can't recall most of them, there was one about ions being isoelectronic, the electrolysis of KMnO4,the mean bond enthalpy, the electron affinity of oxygen, first ionization energy of oxygen atom, the systematic naming of a compound.....what else?

 

[aldamon]

Also I just realised I missed calculating the enthalpy change....*face palm*

 

[babar baig]

products i put : NaCl, CO2, and H2O. I balanced it too but forgot the numbers now
final answer, i got +96.1 or something
cracking of alkene : horizontal tube with cotton wool soaked in dedocane or dodecane or something XD then heat with a catalyst and collect over water.

please tell me what you wrote for the very last question in the paper!

Yup got the same exactly

 

[babar baig]

The atom economy is 100% because there are no waste products formed......thats what i wrote!!!

Yup thats right !

 

[babar baig]

Mcqs were tricky a bit !
the proton question which element did u write? i wrote xenon?
hess law answer was + 97 KJ mol-1 !
yield was 53-54%
why hydrogencarbonate was used i wrote neutralises teh acid :/
which has highest inoization energy i wrote bromine !

Everthing same here bro

 

[aldamon]

were we supposed to write name or formula of a suitable compound for an intake of iodide ions?

 

[babar baig]

oh
maaann! I'm so silly i thought they were talking about the electron density map thing. Since its covalent I just drew a circle going around the two carbon bons and no pi bond whatsoever. Do you suppose they'd think my circle thing is the sigma bond gimme a mark? :/ I'm too hopeful, I know

thats right u had to draw a horizontal dumble shaped circle around both carbons as sigma bond and a vertical dumble shaped circle around each carbon as a pie bond!

 

[babar baig]

is NaI correct for that Iodine question?

yeah i guess it was sodium iodide

 

[babar baig]

here is what i did wrong
1.the country and its reason
2.one of the hydrides
3.the ethene and bromine mechanism
4.a part of hess law
However was releaved to have the correct answer (+90 or +96) for the hess law

 

[babar baig]

here is what i did wrong
1.the country and its reason
2.one of the hydrides
3.the ethene and bromine mechanism
4.a part of hess law
However was releaved to have the correct answer (+90 or +96) for the hess law

so probably i lose like max 10 marks and it seems to be fine for an *A*

 

[Hailstorm94]

Somehow managed to score a B in jan...am not even gonna get a C this time..:'(.. Wht was the percentage yield??

4.5% or 4. something

 

[Hailstorm94]

I have many questions.
1)Where does the color go(purple/green)
2)Which ones were isoelectronic
3)What is sodium carbonate used for in cooking
4)Which moles were we supposed to use in the Hess's cycle

1) orange(na+ ion) goes to negative terminal 2) na+ and O2- are isoelectronic which means same number of electrons 3) someone ive heard said baking soda thats correct i personally said indigestion tables which u consume to neutralize acidity in your stomach 4) it was 2x ur first value as 2 moles of nahco3 so 2x115 add 321.6 getting u an answer like 90.8

 

[Manasa]

was the andwr for enthalpy change 4000 smth or 400 smth??...

 

[babar baig]

1) orange(na+ ion) goes to negative terminal 2) na+ and O2- are isoelectronic which means same number of electrons 3) someone ive heard said baking soda thats correct i personally said indigestion tables which u consume to neutralize acidity in your stomach 4) it was 2x ur first value as 2 moles of nahco3 so 2x115 add 321.6 getting u an answer like 90.8

Freaking cool man i got that !

 

[babar baig]

was the andwr for enthalpy change 4000 smth or 400 smth??...

manasa it was -115kj