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WorksheetsRubber
Total questions: 26
Worksheet time: 9mins
Which of the following is not the Malaysia’s major exports
rubber gloves,
condoms
catheters
ballons
What is the monomer of natural rubber?
vinyl chloride
propene
stryene
isoprene
identify the homologous series for isoprene?
alkane
alkyne
carboxylic acid
alkene
Diagram shows latex in natural rubber.Diagram show
rubber polymer
isoprene
rubber monomer
no answer
What is IUPAC name for isoprene
2-methylbut-1,3-diene.
2-methylbut-2,3-diene.
3-methylbut-1,3-diene.
2-methylbut-1,4-diene.
Why rubber does not coagulate?
protein membrane of rubber particles is negatively charged on the outer surface.
This causes rubber particles to repel each other
This causes rubber particles to attract each other
protein membrane of rubber particles is positively charged on the outer surface.
What is the factor that affects the resistance of natural rubber towards oxidation by air?
The characteristics of natural rubber
rubber polymers
natural elastomeric polymers.
The presence of double bond C=C in the rubber polymerstructure
What is the Characteristics of natural rubber
soft
elastic
not Waterproof
not easily oxidised
not reactive to chemical
At high temperature, natural rubber will become soft and sticky.Based on the statement,what is the Characteristics of natural rubber
soft
not Waterproof
not easily oxidised
Low heat resistance
not Reactive to chemicals
The limitations found in natural rubber can be overcome
The characteristics of natural rubber
adding certain additives to obtain the desired characteristics.
natural elastomeric polymers.
The presence of double bond C=C in the rubber polymerstructure
Which diagram shows
The negatively charged protein membrane causes rubber particles to repel each other.
Hydrogen ions, H+ from acid neutralise the negatively charged protein membrane.
Rubber particles collide with one another that causes the protein membrane to break
Rubber polymers combine with one another that causes latex to coagulate.
Which diagram shows
The negatively charged protein membrane causes rubber particles to repel each other.
Hydrogen ions, H+ from acid neutralise the negatively charged protein membrane.
Rubber particles collide with one another that causes the protein membrane to break
Rubber polymers combine with one another that causes latex to coagulate.
Which diagram shows
The negatively charged protein membrane causes rubber particles to repel each other.
Hydrogen ions, H+ from acid neutralise the negatively charged protein membrane.
Rubber particles collide with one another that causes the protein membrane to break
Rubber polymers combine with one another that causes latex to coagulate.
Which diagram shows
The negatively charged protein membrane causes rubber particles to repel each other.
Hydrogen ions, H+ from acid neutralise the negatively charged protein membrane.
Rubber particles collide with one another that causes the protein membrane to break
Rubber polymers combine with one another that causes latex to coagulate.
Acid can coagulate the latex by
adding ammonia solution
neutralising the negatively charged protein membrane.
by adding a weak acid into the latex,
it can occur naturally by leaving the latex exposed to the air.
Bacteria in the air enter the latex and secrete lactic acid
What is the functions of Alkaline solutions
consist of hydroxide ions, OH−
can neutralise the acid produced by the bacteria.
The protein membrane of rubber particles remains negatively charged
rubber particles will continue to attract when they draw near one another.
Choose coagulant substance
i)Formic acid
ii)Ammonia solution
iii)Barium hydroxide solution
iv)Formaldehyde
v)Vinegar
ii,iii
ii,iii and iv
i,iv,v
i,v
Choose anticoagulant substances
i)Formic acid
ii)Ammonia solution
iii)Barium hydroxide solution
iv)Formaldehyde
v)Vinegar
ii,iii
ii,iii and iv
i,iv,v
i,v
State the characteristic of natural rubber based on diagram
process of producing rubber that is more elastic
The sulphur cross-links make vulcanised rubber stronger.
Natural rubber is soft
the double bond between carbons found in rubber molecules will react with sulphur or other substances to produce sulphur cross-links
easily oxidised when exposed to the air for a long period of time.
Choose the correct statement based on Diagram
for certain types of rubber, particularly synthetic rubber which does not contain C C.
Vulcanised rubber produced is free from sulphur and more environmentally friendly.
Natural rubber is soft
produce vulcanised rubber without using sulphur
easily oxidised when exposed to the air for a long period of time.
Identify A and B
i)A Unvulcanised Rubber
ii)B Vulcanised Rubber
iii)A vulcanised Rubber
iv)B Unvulcanised Rubber
i and iv
ii and iii
i and ii
i and iii
Choose characteristic of Vulcanised Rubber
i)Less elastic
ii)hard
iii)Resistant to high heat
iv)Easier to be oxidised
i and iv
ii and iii
i and ii
i and iii
Choose examples of synthetic rubber
neoprene
styrene-butadiene rubber (SBR)
silicone rubber.
isoprene
poliisoprene
Which of the following are not the characteristics og synthetic rubber
hard
Elastic
Resistant to oxidation
Resistant to chemicals
Heat conductor
Name a synthetic rubber that can be used to manufacture surgical gloves.
neoprene,
styrene-butadiene rubber (SBR)
silicone rubber
Nitrile rubber
How are the characteristics of natural rubber surgical gloves different from those produced by using synthetic rubber?
Resistant to oil and solvent
heat conductor
heat resistant
soft
