Chemistry in Day to Day Life

8/20/2019 Chemistry in Day to Day Life

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Chemistr

yInEveryday

Life


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realised that it inuences everysphere of human life. The principlesof chemistry have been used for the

benet of mankind. Think ofcleanliness — the materials likesoaps, detergents, household

bleaches, tooth pastes, etc. will cometo your mind. Look towards thebeautiful clothes — immediately

chemicals of the synthetic bres usedfor making clothes and chemicalsgiving colours to them will come toyour mind. !plosives, fuels, rocketpropellants, building and electronic


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em s ry s a g par oour everyday life. #e nd

chemistry in daily life inthe foods we eat, the air

we breathe, our soap, ouremotions and literally

every ob$ect we can seeor touch. %ere&s a look atsome everyday


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Why the sky isblue?We a

ll can look up to the sky and see itsbeautiful blue colour. Why is it blue, andnot red, or white for instance? There isa phenomenon named 'ayleighscattering that consists on thescattering of light by particles muchsmaller than its wavelength. This eectis especially strong when light passesthrough gases. Each of the wavelengths

of light suers a dierent scatteringwhen it encounters the gas particlesthat form the atmosphere (nitrogen,oygen!. This eect is more prominent

in the case of short light wavelengths,that are the blue end of the visible


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"ow #oap $leans#oap is an ecellent cleanser because of

its ability to act as an emulsifyingagent. %n emulsi&er is capable ofdispersing one li'uid into another

immiscible li'uid. This means that whileoil (which attracts dirt! doesnt naturally

mi with water, soap can suspendoil)dirt in such a way that it can be

removed. The oil loving part of soapcollects onto the oil stain in the fabric.

*ut then what happens is that it pullsaway from the water, that is+ t puckers,as it were. While the oil loving end

puckers up to the oil in the stain theytogether become surrounded by the

other personality of the soap molecule -


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Why meals are cooked fasterin a pressure cooker?

% pressure cooker is like any otherpot but with a more elaborated lidthat seals the pot completely. When

you heat water inside the pot itboils and the steam cannot escape,so it remains inside and starts to

build up pressure. /nder pressure,cooking temperatures raise muchhigher than under normal conditions

(higher than the boiling point of


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Why 3nions 4ake /s $ry?

/nless youve avoided cooking, youveprobably cut up an onion and

eperienced the burning and tearingyou get from the vapours. When you

cut an onion, you break cells,releasing their contents. %mino acid

sulfoides form sulphuric acids.

En5ymes that were kept separate noware free to mi with the sulphuricacids to produce propanethiol #-oide,

a volatile sulphur compound that

wafts upward toward your eyes. This

h i i


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Why ice oats inwater

ce oats because it is about 67 lessdense than li'uid water. n otherwords, ice takes up about 67 morespace than water, so a litre of iceweighs less than a litre water. Theheavier water displaces the lighterice, so ice oats to the top. 3ne

conse'uence of this is that lakes andrivers free5e from top to bottom,allowing &sh to survive even when the

surface of a lake has fro5en over. f ice


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Why smoking is so harmful?

Why smoking causes cancer? It's because

tobacco and tobacco smoke contain more than 60carcinogenic compounds In genera!" more than

#"000 individua! substances have been identi$edin tobacco smoke" inc!uding carbon mono%ide"

hydrogen cyanide" ammonia and other to%icirritants

&esides a!! the harmfu! eects of tobacco" it'saddictive" and this e%p!ains hy a!though 0* of

smokers ant to +uit and ,-* attempt to +uiteach year" feer than * succeed .he main

reason hy tobacco becomes addictive is due to


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"ow 8oes #unscreen Work?#unscreen combines organic and inorganicchemicals to &lter the light from the sun so

that less of it reaches the deeper layers ofyour skin. 9ike a screen door, some lightpenetrates, but not as much as if the doorwasnt present. #un block, on the other hand,

reects or scatters the light away so that itdoesnt reach the skin at all.

#hat (unscreens (creen.he portion of the sun!ight that is $!tered orb!ocked is u!travio!et radiation .here are threeregions of u!travio!et !ight

/12 penetrates deep!y into the skin and can !eadto cancer and premature skin aging

/1& is invo!ved in tanning and burning of your


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y co ee eeps youawake

t is well-known that the eect of

coee on mood is related to itscontent in caeine. There is a

chemical in our brain called

adenosine, which binds to certainreceptors and slows down nerve cellactivity when we are sleeping. To a

nerve cell, caeine looks like

adenosine and it binds to theadenosine receptors. "owever, as itsnot really adenosine, it doesnt slow

down the cells activity like adenosine


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3o is curd formed4

5ormation of curd in mi!k is ca!!ed'5ermentation ' Curd is formed hen mi!k

is pasteuried and fermented by acombination of !actic acid bacteria and a

protease Curds are a dairy productobtained by curdling (coagu!ating) mi!k

ith rennet or an edib!e acidic substance

such as !emon 7uice or vinegar" and thendraining o the !i+uid portion (ca!!ed hey)2!so natura! souring by !actic acid bacteria

or yeast !eads to curdling (sour mi!kcheese


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e%perimenta! sciencehich !ets us tounderstand our or!d andmakes our !ife easier 28

one observes hat hedoes in his day to day !ife"

it i!! become easier"faster and funnier to

understand the mystery of


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Chemistry in Day to Day Life