Hi,
I was wondering if anyone could tell me what it means for a biopolymer to synthesize?
i.e. "douglas dennis was able to transfer genes from alcalegenes eutrophus that control PHB synthesis.
thanks,
ben
It just means that the monomer units join together into a polymer. Synthesis is combining things, so in this instance it means the same as "polymerise".
would someone be able to illustrate using an example, how we use activity series to figure half equations of displacement redox stuff? thank you 
Hey
A redox reaction always has a species being oxidised (lose electrons) and a species being reduced (gain electrons). In a displacement reaction, you need to determine if the solid metal will oxidise and the cations reduce.
Let's say you placed a piece of zinc into copper nitrate in a displacement reaction.
Will the zinc oxidise? Will the copper ions reduce?
This is when the Data Sheet is your best friend.
}\rightarrow\ce{Zn^{2+}}+\ce{2e^{-}}\\ \text{=0.76V}\\ \ce{Cu^{2+}}+\ce{2e^{-}}\rightarrow\ce{Cu(s)}\\ \text{=0.34V})
The voltages are potentials, or how willing zinc is to lose electrons, or how willing copper is to gain electrons. The larger the potential, the more spontaneous the reaction is. To see if a displacement reaction will actually occur, you need to find the total potential (E
o value) by adding zinc's oxidation potential (0.76V) with copper ions reduction potential (0.34V), which is 1.1V. Since it is positive, a reaction will occur because the displacement is willing to occur (spontaneous). The above equations are your half-equations.
If the total potential were negative, such as copper metal in zinc ions, there would be no half-equations because nothing happens.
Hope this helps
Hey!
So I'm looking at the syllabus dot point which states Explain what is meant by a condensation polymer
I understand that a condensation polymer is a polymer (long chain molecule) formed when pairs of monomers join and a small molecule (usually water) is eliminated.
but I don't understand the statement "Condensation polymers are made from monomers that have two different groups of atoms that can join together"
*I put the bit I don't understand in bold
also, does
"One or two types of monomers can be involved and no double bond is required – the bond forms where the molecule is eliminated."
mean that there cannot be three monomers? Also does it also mean that alkanes can form condensation polymers?
I'm also not really sure what is being addressed in this statement
"The end product of condensation polymerisation depends on the number of functional end groups of the monomer that can react. If there is only one reactive group the growing chain will terminate. With two reactive end groups a linear polymer if formed. with three or more reactive end groups a three-dimensional, cross0-linked polymer can be made"
^This is a statement I have memorised, but I have no idea what it means. My main problem is that I don't understand/am not used to the terminology.
Esterification is a condensation reaction, but cannot polymerise because the 'monomers' only have one functional group each.
Cellulose is a condensation polymer because each glucose monomer has multiple functional groups.
For the 3D polymers, they're not in the syllabus.
Also, for the "describe condensation", you don't necessarily have to include where the water comes from. As long as you include "Monomers with two functional groups each polymerise to form a polymer and a small molecule such as water." then you'll get the marks. Give an example if you have enough lines, and talk about cellulose.
also how do we do q4 from the 2005 hsc
https://www.boardofstudies.nsw.edu.au/hsc_exams/hsc2005exams/pdf_doc/chemistry_05.pdf
The question states that the polymer is a condensation polymer, so the monomers must have two functional groups each (the two can be the same type). You can immediately eliminate A and C because of those H-benzene-H molecules, which have no functional groups (-H are not functional groups). All the other monomers have two hydroxyl groups that allow for condensation, however 1st one of Option B has a double bond, which would undergo addition on the carbons rather than condensation on its two hydroxyl groups. Hence, the answer is D. I would do a bit of trial-and-error tbh.
can someone pls check my answers :/
CH3CHOHCH3
is that 2-propanol?
CH3CH2CHOHCH2CH2CH2OH
1,4-hex diol??
how do we draw this
Yep, they're both correct.
2-propanol can also be propan-2-ol
Admire my fabulous Paint skills...
Home
Help
Search
Login
