Chemistry unit 1 6CH01 Discussion! :)

[Kiara Fernando]

in the mcq where they ask, propene or butane or pentane or something, what was the answer?

 

[Kiara Fernando]

in question 22 there was a question about carbon bonds may be....i drew the p-orbitals and shown pi and sigma bonds is it okay?

i wrote the same thing

 

[TheYearsThatCount]

in the mcq where they ask, propene or butane or pentane or something, what was the answer?

Answer is (A) Ethane.

Two methane free radicals join to form one ethane molecule

 

[Kiara Fernando]

is NaI correct for that Iodine question?

 

[Kiara Fernando]

Answer is (A) Ethane.

Two methane free radicals join to form one ethane molecule

oh thanks god

 

[TheYearsThatCount]

oh thanks god

You're welcome.
Just helping a fellow Sri Lankan

 

[TheYearsThatCount]

is NaI correct for that Iodine question?

Do you remember the question?, I cant really remember

 

[Kiara Fernando]

what compound would be soluble to form with iodine?

 

[ammar.danish1]

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

IT was 54% and isoelectronic were the one which Had NA+ and some other i guess

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

Green colour going to positive terminal
Baking Soda / cooking oil
Na+ and other was isoelectronic
4 i dont know

 

[TheYearsThatCount]

what compound would be soluble to form with iodine?

Oh, Yes Sodium Iodide is correct.

 

[ammar.danish1]

what compound would be soluble to form with iodine?

LOL i wrote NAI that's wrong i know

 

[Kiara Fernando]

LOL i wrote NAI that's wrong i know

man i wrote the same thing arghhh

 

[TheYearsThatCount]

IT was 54% and isoelectronic were the one which Had NA+ and some other i guess
Green colour going to positive terminal
Baking Soda / cooking oil
Na+ and other was isoelectronic
4 i dont know

I put purple to positive terminal (MnO4(2-)). Since its a negative ion and is purple colour

Na+ and O2- were isoelectronic

You should divide the moles you got in the pervious part by 2 for the hess cycle calculation. You get 96KJmol-1 or something

 

[trsa1995]

IT was 54% and isoelectronic were the one which Had NA+ and some other i guess
Green colour going to positive terminal
Baking Soda / cooking oil
Na+ and other was isoelectronic
4 i dont know

it was purple going to positive terminal not Green :/ magnate ions are purple bro

 

[Kiara Fernando]

Oh, Yes Sodium Iodide is correct.

YAY

 

[TheYearsThatCount]

man i wrote the same thing arghhh

LOL i wrote NAI that's wrong i know

If this is for the thyroid question then NAI is correct. KI is more commonly used but NAI is correct

 

[Zainkhan]

any soluble iodide is correct , KI , NaI anything soluble is correct ....

 

[Zainkhan]

Hess law the general equation is (2 times H1)-(-h2)) ( both arrows going down), products were 2NaCl,2CO2,2H20, i got the final answer as +96.1KJmol-1 Delta H must be positive because it was a decomposition reaction.

 

[chathumus]

in the mcq where they ask, propene or butane or pentane or something, what was the answer?

OMG KIARA! HAAAAIII lol

 

[Zainkhan]

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