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WorksheetsConsumer and industrial chemistry
Total questions: 20
Worksheet time: 11mins
a group of scouts go camping by the seashore. they have to do all their washing using sea water.
what is the suitable substance for them to wash their clothes effectively?
soap
bleach
detergent
antiseptic
chemical equation below shows the process of saponification.
fat + _______ --> soap + ______________
choose the correct reactant(R) and product(P)
R-sodium hydroxide, P-water
R-potassium hydroxide, P-glycerol
R-sodium oxide, P-glycerol
R-fatty acid, P-RCOONa
sally found clothes washed by detergent cleaner and looks brighter.
what additive is found in the detergent?
sodium perborate
fluorescent dyes
sodium silicate
protease
which statement is correct about fats and oils?
they are chemically different
they are mixture of organic acids and glycerol
they are not important because lead to health problems
fats come from plants while oils come from animals
Monosodium glutamate(MSG) is a flavouring agent. The addition of MSG in children’s food is not encouraged. Why?
Damaged the brain development in children
Appearance of black spot on the skin
Reduce the body immunization towards disease
Making the children become hyperactive
sodium chloride is added to fish to produce salted fish.
which of the following is the main function of sodium chloride?
replace the original fishy taste lost during processing
improve taste and freshness
prevent oxidation so that it does not turn rancid
it draws out water in order to inhibit the growth of bacteria
diagram shows the ingredients in mango-flavoured ice cream.
which of the following is used as stabiliser X?
salt
lecithin
tartrazine
sodium citrate
which of the following drugs is used to reduce fatigue and elevate mood?
paracetamol
penicillin
amphetamine
barbiturate
psychiatric patients are always restless and normally experience difficulties in sleeping.
which medicine is suitable to treat these patients?
aspirin
codeine
barbiturate
streptomycin
amoxicillin is a medicine that has the same function as penicillin.
what is its function?
relief pain
treat psychotic patient
treat bacterial infections
stimulate the body to produce antibody
In the preparation of detergents, step 1 involves the conversion of long-chain alcohol to sulphonic acid. What is the substance that reacted with the alcohol?
Concentrated sulphuric acid
Concentrated nitric acid
Concentrated sodium hydroxide
Concentrated potassium hydroxide
The diagram shows the preparation of soap. What is the role of concentrated sodium hydroxide solution?
to break oil into glycerol and fatty acids
to hydrolyse fatty acids to form glycerols
to neutralise fatty acids to form insoluble salts
to reduce the solubility of soap in the water
Why is nano-scale titanium dioxide used in suncream?
It is cheap.
It is antibacterial.
It blocks ultraviolet light.
It breaks down dirt.
Which of this properties are specific to graphene?
Flexible.
Fragile
Transparent
Soft.
Conductive
Used metal containers such as aluminium tins or iron tins need to be recycled. Which of the following are the reasons for recycling them?
Preserve natural resources
Reduce needs to collect used tins
Reduce the amount of waste buried in landfills
Reduce the amount of pollution at the site of extraction of ores
Green technology promotes the development of alternative fuels from natural resources that are a renewable and efficient use of energy to replace energy from fossil fuels. Alternative energy includes
wind energy
bioenergy
wave energy
solar energy
The electrocoagulation method is the latest green technology to treat sludge waste. An electric current, not chemicals, is used to deposited colloid particles in the liquid waste in an electrolytic cell. What is the material used as the anode?
Aluminium
Iron
Copper
Zinc
Which of the following heavy metals ions can be removed from the waste \water through the electrolysis process?
Na+
Be2+
Li+
Pb2+
