10 questions
Perfume contain esters. Which of the following is a property of ester?
can conduct electricity
dissolve in water
denser than water
low boiling point
The diagram represent the structural formula of a carbon compound. The compound is produced by the reaction between
ethanol and butanoic acid
ethanol and propanoic acid
butanol and ethanoic acid
propanol and ethanoic acid
What is the name of the functional group for ester?
carboxyl
carboxylate
hydroxyl
carbon-carbon double bond
Name the ester that produced from the reaction between butanoic acid and methanol? _________________________
Unsaturated fats can be converted into saturated fats by a process called catalytic _______________ ?
hydrogenation
oxidation
dehydration
fermentation
Fatty foods are very high in calories. Medical research found that a diet high in animal fats is considered unhealthy. What type of fats that will raise the level of cholesterol in the bloodstream?
saturated fats
unsaturated fats
Which substance is a natural polymer?
polythene
polyisoprene
polypropene
polyvinyl chloride
A rubber tapper finds that latex coagulates after several hours. What substance should be added into the latex to prevent it from coagulating?
Formic acid
Sodium chloride solution
Ammonia solution
Nitric acid
Charles Goodyear (December 29, 1800 – July 1, 1860) was an American self-taught chemist and manufacturing engineer who developed vulcanized rubber.
Nowadays in industrial vulcanization, latex is heated or exposed to _______________ to produced vulcanized rubber.
ammonia solution
disulphur dichoride
concentrated hyrdochloric acid
methanoic acid
The aircraft tyres are made from vulcanized rubber. What property of vulcanized rubber makes it suitable to be used for making these aircraft tyres?
it resist to oxidation
it is harder and stronger
it can maintain their elasticity
it can take the tremendous stress and strength