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Quiz about The Uses of Various Chemical Substances
Quiz about The Uses of Various Chemical Substances

The Uses of Various Chemical Substances Quiz


There are several chemical substances that have very important uses in our daily lives. How much do you know about these substances?

A multiple-choice quiz by angikar. Estimated time: 4 mins.
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Author
angikar
Time
4 mins
Type
Multiple Choice
Quiz #
370,654
Updated
Sep 06 23
# Qns
10
Difficulty
Average
Avg Score
7 / 10
Plays
993
Last 3 plays: Guest 68 (5/10), Brooklyn1447 (4/10), agglida (8/10).
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Question 1 of 10
1. A tincture of this non-metal is applied to cuts and wounds as an antiseptic. Which non-metal am I talking about? Hint


Question 2 of 10
2. Which substance is primarily used as a fire extinguisher for fires originating from electrical equipment? Hint


Question 3 of 10
3. Dental amalgams can be used to fill tooth cavities. What are these dental amalgams made from? Hint


Question 4 of 10
4. Which of these fuels is a commonly used fuel for cooking food? Hint


Question 5 of 10
5. Which of these elements is mostly used for long-distance electrical transmission? Hint


Question 6 of 10
6. Iron is galvanized to prevent rusting and corrosion. Which metal is primarily used for galvanization? Hint


Question 7 of 10
7. Plaster of Paris is commonly used for making moulds and statues. Which compound is used to make Plaster of Paris? Hint


Question 8 of 10
8. The water of a swimming pool is disinfected by passing which nonmetal through the water? Hint


Question 9 of 10
9. Tamarind tastes sour because it contains which acid? Hint


Question 10 of 10
10. A solution of aqua regia can be used to polish items made of gold. What is aqua regia a mixture of? Hint



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quiz
Quiz Answer Key and Fun Facts
1. A tincture of this non-metal is applied to cuts and wounds as an antiseptic. Which non-metal am I talking about?

Answer: iodine (I)

A tincture of iodine contains iodine in ethyl alcohol (the solvent), mixed with some potassium iodide (KI). Methyl alcohol is not used as it is poisonous. This solution is reddish brown in colour. When applied on cuts and wounds, iodine, being an antiseptic, helps prevent infections. Iodine can also be used to get relief from pain when it is mixed with petroleum jelly to make a paste.
2. Which substance is primarily used as a fire extinguisher for fires originating from electrical equipment?

Answer: carbon dioxide (CO2)

Water, though the most common fire extinguisher, cannot be used to put out electrical fires, as common water, which contains dissolved salts in it, is a good conductor of electricity, and therefore would allow the electricity to flow. This could harm the electrical equipment.

However, carbon dioxide does not do so. It does not harm the electrical equipment. Although gaseous normally, carbon dioxide can be stored as a liquid under immense pressure. When released, it expands enormously and covers the burning substance like a blanket, cutting off the supply of oxygen, which stops the combustion. Also, when released, it cools down a lot. Thus, apart from acting as a blanket, it also lowers the temperature of the burning substance. If its temperature falls below the ignition temperature (the minimum temperature required to burn), it stops burning.
3. Dental amalgams can be used to fill tooth cavities. What are these dental amalgams made from?

Answer: alloys of mercury, along with silver, tin and copper

Previously, alloys of gold or silver(mixed with some other substances to make them tougher) were used to fill the tooth cavities, but they are so expensive that dental amalgams became more popular. However, they are not a perfect alternative to our teeth, so we should not give up our habit of brushing our teeth thinking that the dental amalgams will fill the cavities! The popularity of amalgams has decreased due to concerns about the toxicity of mercury.
4. Which of these fuels is a commonly used fuel for cooking food?

Answer: LPG

LPG stands for Liquefied Petroleum Gas. Petroleum gas is a gaseous fuel obtained from the fractional distillation of petroleum. Petroleum gas can be however stored as a liquid (in LPG) under immense pressure. LPG is preferred to solid fuels such as coal and liquid fuels such as petrol as LPG is a gaseous fuel and therefore burns more completely. It also produces less solid residue such as soot and harmful poisonous substances such as carbon monoxide (CO). LPG also has a higher calorific value. Its primary constituent is butane. Butane combines with the oxygen in the air to form carbon dioxide and water vapour. The chemical reaction is:-

2C4H10 + 13O2 = 8CO2 + 10H2O

Butane is a compound of the alkane group. Hydrogen, although non-polluting, is not used as it is highly reactive and is unsafe to carry, handle and use.
5. Which of these elements is mostly used for long-distance electrical transmission?

Answer: aluminium (Al)

Silver is the best conductor of electricity but it is not used to make these wires as it is very expensive. Copper is the next best conductor of electricity, followed by aluminium. Domestic wires are covered by a layer of electrical insulation, such as bakelite, for safety. All metals (except tungsten) are good conductors of electricity as they have free electrons in their valence shell. Sodium is not used as it is a soft and highly reactive metal. Aluminium is ductile, i.e. it can be drawn into wires, and is thus used for electrical transmission.
6. Iron is galvanized to prevent rusting and corrosion. Which metal is primarily used for galvanization?

Answer: zinc (Zn)

Iron reacts with the water vapour and oxygen in the air when left exposed in moist air and forms a layer of hydrated ferric oxide or rust (Fe2O3.xH20 - the number of water molecules varies). The rust formed slowly eats away the metal. Galvanization is done to prevent this.

The iron article is placed in molten zinc in this process, then it is allowed to cool. The molten zinc solidifies to form a firm coating on the iron article. The layer of zinc acts as a protective layer and prevents rusting. Although electroplating is a better method of protection, it is more expensive.
7. Plaster of Paris is commonly used for making moulds and statues. Which compound is used to make Plaster of Paris?

Answer: calcium sulphate

Calcium sulphate is used as plaster of Paris as 2CaSO4.H2O. Plaster of Paris is used to support broken bones during the healing process. When a broken limb is set in a cast made of a paste of plaster of Paris in water, movement of the bone is restricted, which helps the bone to heal. Calcium sulphate is also used as gypsum (CaSO4.2H2O) in the cement industry. Calcium sulphate is a salt.
8. The water of a swimming pool is disinfected by passing which nonmetal through the water?

Answer: chlorine (Cl)

Chlorination purifies the water. Chlorine gas forms a mixture of hydrochloric acid (HCl) and hypochlorous acid (HOCl) when passed through water. Hypochlorous acid is, however, quite unstable. Thus the hypochlorous acid breaks down into oxygen and hydrochloric acid when the resulting acidic mixture is placed in sunlight or heated. The hydrochloric acid formed kills the germs present in water. However this has to be done cautiously as an excess of hydrochloric acid could be harmful for those swimming in the swimming pool.

Cl2 + H2O = HCl + HOCl

or 2Cl2 + 2H2O = 2HCl + 2HOCl
or 2Cl2 + 2H2O = 2HCl + 2HCl + O2
Result:-
2Cl2 + 2H2O= 4HCl + O2
9. Tamarind tastes sour because it contains which acid?

Answer: tartaric acid

The molecular formula of tartaric acid is HO2CCH(OH)CH(OH)CO2H. Its basic formula is simply C4H6O6. Tartaric acid is used as a souring agent and can also be found in baking powder. Tartaric acid is an organic acid and is less corrosive than mineral acids. Oxalic acid is found in tomatoes. Ascorbic acid is Vitamin C. Citric acid is found in citrus fruits such as lemon and orange.
10. A solution of aqua regia can be used to polish items made of gold. What is aqua regia a mixture of?

Answer: nitric acid and hydrochloric acid

Aqua regia is the most powerful acidic mixture. The upper layer of gold articles becomes dull when exposed to moist air for a long time, so gold articles can be placed in aqua regia solution in order to clean them. Then the acid reacts with the impurities present.

The upper layer of gold gets washed away due to this and there is a loss of mass, exposing the inner layer. The gold article appears polished as the shine of the inner layer of gold is still intact. Items should not be left in the solution too long, or they will dissolve completely.
Source: Author angikar

This quiz was reviewed by FunTrivia editor rossian before going online.
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