Chemistry: Post your doubts here!

[Tasneem_m98]

Is NO2+ (2 is a subscript and + is the charge) acting as a bronsted lowry base in the reaction NO2+ + H2O -> H2NO3+ (3 is a subscript and + is the charge)?????

 

[ashcull14]

A?
Cuz it contains the most C-Cl bonds, so will produce the most amount of Cl• free radicals

D?
Cuz C-I bond is the weakest so will produce precipitate fastest

thanks

 

[The Sarcastic Retard]

Someone please help. M/J 2014 paper 11 number 8
Link:https://www.google.com.sa/url?sa=t&...EQFjAD&usg=AFQjCNGId_JPSUXCASA68wmpsYeS_rC1Xg

Thank you!

PH should be 7 and temp should be low.

 

[The Sarcastic Retard]

Is NO2+ (2 is a subscript and + is the charge) acting as a bronsted lowry base in the reaction NO2+ + H2O -> H2NO3+ (3 is a subscript and + is the charge)?????

where do u find this eqn?

 

[Studydayandnight]

How do we do this?

Correct answer is C.

 

[Studydayandnight]

Helpppppppp

Correct answer is B.

 

[Studydayandnight]

NEED HELPPPP

Correct answer is D.

 

[Studydayandnight]

How is the answer B?

:'(

 

[Studydayandnight]

Omg, I don't understand half the paper. -_-

HELPPP

Correct answer is B.

 

[princess Anu]

Helpppppppp

Correct answer is B.

See if you understand this

 

[princess Anu]

Q2

 

[Studydayandnight]

Q2

I do get it Thanks

 

[tiki-taka]

28. all correct
29. only 1 is correct
can someone explain the logic??

 

[The Sarcastic Retard]

if "X" represents any one of the elements of G2: http://www.chemguide.co.uk/inorganic/group2/heatniteqtn.gif
1 mol of Mg(NO3)2 ------> 2 mol of NO2
n = m/Mr
n(Mg(NO3)2) = 7.4/148.3
n(NO2) = 2 * n(Mg(NO3)2) = 0.099797... ; 0.10 (2sf)
m = Mr * n
m(NO2) = 46 * 0.10 = 4.6g

 

[The Sarcastic Retard]

View attachment 54088
28. all correct
29. only 1 is correct
can someone explain the logic??

check answer of 28... It should be D

 

[Metanoia]

Omg, I don't understand half the paper. -_-

HELPPP

Correct answer is B.

Look at the molecules, which one of them is optically active (have a chiral carbon)?

Look at the groups connected to the double bonds, which of them is showing the trans isomerism?

 

[Sarosh Jameel]

HELP !

 

[Metanoia]

HELP !

With such questions, the neatest approach would be to use the tables to keep track of the quantities of reactants and products.

 

[obaid-ur-rehman]

9701/11/O/N/12 Ques 4

 

[princess Anu]

9701/11/O/N/12 Ques 4

is it A