Need Help on these questions! (1 Viewer)

[cook E]

Q1. Have no clue
Q2. Have no clue
Q3a. I know the by product is water, but I don't get how the polymer is an ester.
b. Do we just divide 60000 by the polymers molar mass? Or do we have to subtract
water aswell. I'm confused.

Btw I don't have the answers for these questions.

 

[MNsz]

I think you divide it by the polymers molar mass.

 

[muzeikchun852]

1) (i) you are right.
- (ii) Mg > Zr > Zn > Ni
- (iii) should be (-)

2 (a) it's right.
(b) check you note. it should be something - radiation going in the tube. ionise the argon ion in the air, etc.

3 (a) it is an ester because it has the COOC group, but glycolic acid doesnt, so it's not an ester.
however, the question only requires you to answer why it is classed as polyester - just say it undergoes a condensation reaction.

(b) find the molar mass of PGA - then 60,000 divide by that number.

 

[cook E]

1) (i) you are right.
- (ii) Mg > Zr > Zn > Ni
- (iii) should be (-)

2 (a) it's right.
(b) check you note. it should be something - radiation going in the tube. ionise the argon ion in the air, etc.

3 (a) it is an ester because it has the COOC group, but glycolic acid doesnt, so it's not an ester.
however, the question only requires you to answer why it is classed as polyester - just say it undergoes a condensation reaction.

(b) find the molar mass of PGA - then 60,000 divide by that number.

Hey man, can you elaborate on 1ii?
I get the others thank you very much.

 

[muzeikchun852]

Hey man, can you elaborate on 1ii?
I get the others thank you very much.

galvanic cell flows from anion to cation (negative to positive) right? and more reactive metal displace the less reactive metal right?
so firstly, the polarity of Zr with Mg is (-), hence Mg > Zr
secondly, the polarity of Zr in the next two is (+), hence Zr > Ni, Zr > Zn
but to see whether Zn is more reactive than Ni, or the other way around, you have to use the potential differences.
the greater the voltage, the higher the reactivity between metal, hence Mg > Zr > Zn > Ni.

 

[cook E]

galvanic cell flows from anion to cation (negative to positive) right? and more reactive metal displace the less reactive metal right?
so firstly, the polarity of Zr with Mg is (-), hence Mg > Zr
secondly, the polarity of Zr in the next two is (+), hence Zr > Ni, Zr > Zn
but to see whether Zn is more reactive than Ni, or the other way around, you have to use the potential differences.
the greater the voltage, the higher the reactivity between metal, hence Mg > Zr > Zn > Ni.

Oh ok I get it thank you man.
You're repped =D