Chemistey Doubts

[JmCullen]

what's the different between isomers and isotopes?

 

[haochen]

isotope:
same element which hv the same number of proton (atomic number) and different atomic mass.
eg. U-238 and U-235

isomers:
An element which hv the same molecular formula but different structure formulas
eg.But-1-ene and But-2-ene

hope u understood

 

[1bilalm]

next.. sorry.. im not good in chemistry..

what is the structure of protein?
is it NH2-CRH-C=O-OH ????

yeah actully wat i know is dat the formula for PROTEN is just NH2

 

[JmCullen]

isotope:
same element which hv the same number of proton (atomic number) and different atomic mass.
eg. U-238 and U-235

isomers:
An element which hv the same molecular formula but different structure formulas
eg.But-1-ene and But-2-ene

hope u understood

oh i see.
Thanks a lot!
how about this..

differences in volatility, solubility and electrical conductivity between ionic and covalent compounds

what i know, ionic is soluble and it is good conductor of electricity when molten right?

 

[haochen]

isotope:
same element which hv the same number of proton (atomic number) and different atomic mass.
eg. U-238 and U-235

isomers:
An element which hv the same molecular formula but different structure formulas
eg.But-1-ene and But-2-ene

hope u understood

oh i see.
Thanks a lot!
how about this..

differences in volatility, solubility and electrical conductivity between ionic and covalent compounds

what i know, ionic is soluble and it is good conductor of electricity when molten right?

yeah but u need to know ionic is soluble in water and covalent is soluble in organic liquid
covalent dont conduct electricity

 

[JmCullen]

isotope:
same element which hv the same number of proton (atomic number) and different atomic mass.
eg. U-238 and U-235

isomers:
An element which hv the same molecular formula but different structure formulas
eg.But-1-ene and But-2-ene

hope u understood

oh i see.
Thanks a lot!
how about this..

differences in volatility, solubility and electrical conductivity between ionic and covalent compounds

what i know, ionic is soluble and it is good conductor of electricity when molten right?

yeah but u need to know ionic is soluble in water and covalent is soluble in organic liquid
covalent dont conduct electricity

how about the volatility and electrical conductivity?
covalent conduct electricity?

 

[haochen]

covalent dont conduct electricity

ionic is non-volitile

covalent is volatile

hope it helped

 

[JmCullen]

covalent dont conduct electricity

ionic is non-volitile

covalent is volatile

hope it helped

thanks!!!
oh..
btw, what is the name of "same number of protons but different number of neutrons"?
is it isotope?

 

[xIshtar]

covalent dont conduct electricity

ionic is non-volitile

covalent is volatile

hope it helped

thanks!!!
oh..
btw, what is the name of "same number of protons but different number of neutrons"?
is it isotope?

Yep, an isotope is exactly that..

As for the earlier question about proteins..

The basic units, amino acids, utilise the amine linkage, NH2..

The proteins consist of a carboxylic acid and an amine.. So, it utilises the C=ONH bonding..

Hope I helped..

 

[JmCullen]

covalent dont conduct electricity

ionic is non-volitile

covalent is volatile

hope it helped

thanks!!!
oh..
btw, what is the name of "same number of protons but different number of neutrons"?
is it isotope?

Yep, an isotope is exactly that..

As for the earlier question about proteins..

The basic units, amino acids, utilise the amine linkage, NH2..

The proteins consist of a carboxylic acid and an amine.. So, it utilises the C=ONH bonding..

Hope I helped..

yes, u do help!!!!
finally you appear! hahaha! thx!!!!!!

 

[xIshtar]

No probs. xD. I've been doing M'choice papers all morning, done 6 so far xP..

 

[JmCullen]

No probs. xD. I've been doing M'choice papers all morning, done 6 so far xP..

oh!! no wonder! haha..
oh.. can u explain the difference between concentrated hydrochloric acid and concentrated aqueous sodium chloride and dilute aqueous sodium chloride, dilute sodium chloride when they undergo electrolysis?
i mean, the product. im confuse with concentrated, concentrated aqueous, dilute, dilute aqueous.

 

[MohammedNoor]

Metal X is low in the reactivity series and it is liberated by electrolysis of its bromide.
Metal X is ……1…… and the bromide is ……2…… .
Which words correctly complete gaps 1 and 2?

1 2
A lead in solution
B lead molten
C sodium in solution
D sodium molten


i didnt understand this ............plz explain me this question

 

[xIshtar]

No probs. xD. I've been doing M'choice papers all morning, done 6 so far xP..

oh!! no wonder! haha..
oh.. can u explain the difference between concentrated hydrochloric acid and concentrated aqueous sodium chloride and dilute aqueous sodium chloride, dilute sodium chloride when they undergo electrolysis?
i mean, the product. im confuse with concentrated, concentrated aqueous, dilute, dilute aqueous.

Basically. You need to learn the discharge series, and the ions in a solution in order to answer these questions.

Whenever there is an aqeous solution, there are also OH ions, meaning hydrogen or Oxygen can be formed..

So, for HCl -> At the cathode = Hydrogen, At the anode = Chlorine -> Electrolyte = Used up I believe..
Aqeous Sodium Chloride (Brine) -> At the cathode = Hydrogen, At the anode = Chlorine -> Electrolyte = NaOH forms.

Just make sure you note the ions, and learn the discharge series well..

Metal X is low in the reactivity series and it is liberated by electrolysis of its bromide.
Metal X is ……1…… and the bromide is ……2…… .
Which words correctly complete gaps 1 and 2?

1 2
A lead in solution
B lead molten
C sodium in solution
D sodium molten


i didnt understand this ............plz explain me this question

Low in the reactivity series, immediately eliminates C and D. So, think about the discharge series.. I think B is the answer

 

[JmCullen]

Metal X is low in the reactivity series and it is liberated by electrolysis of its bromide.
Metal X is ……1…… and the bromide is ……2…… .
Which words correctly complete gaps 1 and 2?

1 2
A lead in solution
B lead molten
C sodium in solution
D sodium molten


i didnt understand this ............plz explain me this question

is that B?
it's either A or B.
But im thinking of B though. what's the answer?

 

[MohammedNoor]

No probs. xD. I've been doing M'choice papers all morning, done 6 so far xP..

oh!! no wonder! haha..
oh.. can u explain the difference between concentrated hydrochloric acid and concentrated aqueous sodium chloride and dilute aqueous sodium chloride, dilute sodium chloride when they undergo electrolysis?
i mean, the product. im confuse with concentrated, concentrated aqueous, dilute, dilute aqueous.

Basically. You need to learn the discharge series, and the ions in a solution in order to answer these questions.

Whenever there is an aqeous solution, there are also OH ions, meaning hydrogen or Oxygen can be formed..

So, for HCl -> At the cathode = Hydrogen, At the anode = Chlorine -> Electrolyte = Used up I believe..
Aqeous Sodium Chloride (Brine) -> At the cathode = Hydrogen, At the anode = Chlorine -> Electrolyte = NaOH forms.

Just make sure you note the ions, and learn the discharge series well..

Metal X is low in the reactivity series and it is liberated by electrolysis of its bromide.
Metal X is ……1…… and the bromide is ……2…… .
Which words correctly complete gaps 1 and 2?

1 2
A lead in solution
B lead molten
C sodium in solution
D sodium molten


i didnt understand this ............plz explain me this question

Low in the reactivity series, immediately eliminates C and D. So, think about the discharge series.. I think B is the answer

Yah its the right answer ............can u upload the discharge series......plz .........by the way thnx

 

[JmCullen]

Basically. You need to learn the discharge series, and the ions in a solution in order to answer these questions.

Whenever there is an aqeous solution, there are also OH ions, meaning hydrogen or Oxygen can be formed..

So, for HCl -> At the cathode = Hydrogen, At the anode = Chlorine -> Electrolyte = Used up I believe..
Aqeous Sodium Chloride (Brine) -> At the cathode = Hydrogen, At the anode = Chlorine -> Electrolyte = NaOH forms.

Just make sure you note the ions, and learn the discharge series well..

ohh.. ok! i'll try to do more about this kind of questions. thanks!!!

oh!
i hv one question here..


Describe, in outline, the manufacture of aluminium from pure aluminium oxide in molten cryolite.

basically, how to extract aluminium???
bauxite straight away undergo electrolysis?! :O

 

[xIshtar]

Yah its the right answer ............can u upload the discharge series......plz .........by the way thnx

The discharge series should be in your chemistry book..

Just remember that more reactive metals are lower..
H is above them in the series..
SO4 is lower than OH..

Best advice I can give

Just look in your book at the electrolysis chapter.

 

[brainiac]

here u go this is the reactivity series for metals ................. hope i helped and good luck for exams

 

[MohammedNoor]

Yah its the right answer ............can u upload the discharge series......plz .........by the way thnx

The discharge series should be in your chemistry book..

Just remember that more reactive metals are lower..
H is above them in the series..
SO4 is lower than OH..

Best advice I can give

Just look in your book at the electrolysis chapter.

Discharge series means reactivity series or whatttttttttttttt..............................