Chemistry Question Ahhh!!! (1 Viewer)

[Ambition]

1) Using an example to illustrate your answer, explain how the formation of an addition polymer is different to the formation of a condensation polymer.

How would you answers this?

2) What reactions, conditions and catalyst are required in th reaction of ethene with water?

3)Define the tern weak in relation to acids?

 

[undalay]

1) Using an example to illustrate your answer, explain how the formation of an addition polymer is different to the formation of a condensation polymer.

How would you answers this?

2) What reactions, conditions and catalyst are required in th reaction of ethene with water?

3)Define the tern weak in relation to acids?

1.
- Provide example of additon polymer
- Provide example of condensation polymer.
- Outline how addition monomers have double bonds where as condensation does not.
- Outline how a small molecule (such as water) is emitted from the condesation polymerisation process, where nothing is lost during the addition polymerisatin process.

2.
- High temperatures (300 degrees)
- High pressures
- Dilute acid catalyst such as sulfuric acid
- Maybe write the equation depending on amount of marks allocated.

3.
Weak = Low ionisation %.
For example Acetic acid does not fully ionise, compared to HCl (a strong acid) which fully disassociates to H+ and Cl-

 

[Ambition]

I would really appreciate it, if somone could write out their response.

 

[Martyno1]

For the first one use cellulose (condensation) and polyethylene (addition) as your examples. I won't write out an answer without knowing how many marks it's worth atm.

 

[Ambition]

It is worht 4 marks

 

[uberturtle]

Addition polymerisation is the reaction of small monomer molecules with other monomers to produce polymer chains without the loss of any molecules.

C2H4 --> -(C2H4)n-

yeh can't really do this one properly, i suggest you draw ethene in the exam and show how the double bond breaks to form bonds which connect to other ethylene molecules.


Condensation polymerisation is the reaction of small monomer molecules with each other to produce polymer chains with the loss of a small molecule (eg. water)

C6H12O6 --> C6H10O5 + H2O
Glucose --> Cellulose + Water

NOTE: The atoms taken to make water do not come from only ONE glucose molecule.

 

[rooeys2]

1) Using an example to illustrate your answer, explain how the formation of an addition polymer is different to the formation of a condensation polymer.

How would you answers this?

2) What reactions, conditions and catalyst are required in th reaction of ethene with water?

3)Define the term weak in relation to acids?

1) a addition polymer forms by the joining of unsaturated monomers (or double bonded monomers) that form a long chain (polymer) by breaking their double bonds. (if this question is worth more than 2marks then i would probably talk more specificially about the process, like a catalyst is used to initiate the monomers so they can react with each other, forming a free radical, then they keep linking until the reaction is terminated by another long chain with a free radical)
for eg. polyethylene is a addition polymer formed from ethylene monomers

n(C2H4) ---> -(C2H4)-n
a condensation polymer forms usually from monomers of two different function groups that link together with elimination of a small molecule/ usually water. Cellulose is a condensation polymer formed from glucose monomers:
n(C6H12O6) --------> -(C6H12O6)-n + H2O
​

2) Ethene reacts with water to form ethanol with the presence of dilute sulfuric acid, this reaction is called hydration.​

C2H4(g) + H2O(l)----->C2H5OH(aq)
​

3) Weak acids can only partically ionise/dissociate H+ in water (this means it forms an equilibrium), thus their pH is normally higher than it is supposed to be because there are less H+ dissolved.
for example, acetic acid CH3COOH is a weak acid that only partially ionise in water.

CH3COOH(aq)<-------> CH3COO- (aq) + H+(aq)

hope that helps ​

 

[kooltrainer]

1)
for example, acetic acid CH2COOH is a weak acid that only partially ionise in water.

CH2COOH(aq)<-------> CH2COO- (aq) + H+(aq)

hope that helps ​

acetic acid is CH3COOH

 

[rooeys2]

lol thnx i typed it wrong

 

[uberturtle]

owned by the gummi bear.

 

[avoda28]

1) Using an example to illustrate your answer, explain how the formation of an addition polymer is different to the formation of a condensation polymer.

addition polymers are formed by the addition of many monomers of the same structure. (example ethene/ethylene). the double bond is broken and the monomers are joined together. the process begins with an initiator, and ends with a terminator. Condensation polymerisation uses 2 different monomers (example propanoic acid HOOC-CH2-COOH and 1,3-dipropandioc acid OH-CH2-CH2-CH2-OH) to form the polymer. condensation polymerisation eliminates a small molecule (usually water) as a by-product. addition polymerisation does not.


2) What reactions, conditions and catalyst are required in th reaction of ethene with water?

the reaction is hydration to ethanol. the catalyst required is dilute sulfuric acid. dunno why you need to say conditions thats just weird.

3)Define the tern weak in relation to acids?

a weak acid is any acid that does not completely (100%) ionize.
this means that an acid that ionizes even 99% is still considered weak.

 

[minijumbuk]

n(C6H12O6) --------> -(C6H12O6)-n + H2O

Isn't it meant to be (n-1)H2O?

 

[wogblogger]

yup