Importance Of Chemistry Flashcards

1
Q

higher concentration of which oxides in the atmosphere leads to acid rain

A

sulphur oxides and nitrogen oxides

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2
Q

examples of extreme weather events caused by greenhouse gases and what principles are involved

A

flooding, drought, high wind and storm
principles of geo-chemistry are involved

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3
Q

what does nitrogen oxide do in the brain

A

acts as a messenger compound for transmission of brain waves

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4
Q

what does nitrogen oxide do in the immune system

A

it slows down the growth of tumor cells

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5
Q

which principles are important for nitrogen oxide in our body

A

biochemical process principles

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6
Q

chemical fertilizers

A

urea, ammonium sulphate, etc
help in better production of crops

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7
Q

what is important in the synthesis of various chemical compounds and products of commercial value

A

alkalis
acids
salts
dyes

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8
Q

preservatives used to preserve food and check its wastage

A

sodium benzoate
sodium metabisulphite

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9
Q

which insecticides and pesticides are helpful for crop protection and storage of food grains

A

ddt
gammexane

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10
Q

air conditioners use chemicals like

A

lidquid ammonia or liquid sulphur dioxide

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11
Q

drugs used in cancer therapy

A

cisplatin and taxol

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12
Q

drug used for helping AIDS victim

A

azt (azidothymidine)

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13
Q

class of ceramic material used for making superconductors are called

A

perovskites

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14
Q

what are conducting polymers

A

organic polymers that conduct electricity

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15
Q

what is optical fibre

A

flexible, transparent fibre made of pure glass (silica) not much wider than human hair

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16
Q

refrigerant responsible for ozone depletion in the stratosphere

A

cfc (chlorofluorocarbons)

17
Q

cfc has been replaced with

A

chemically synthesized- R-410A
natural- ammonia, carbon dioxide, sulphur dioxide, nonhalogenated hydrocarbons

18
Q

refrigerant which has no effect on ozone layer

A

ammonia

19
Q

refrigerants which have a low effect on ozone layer

A

carbon dioxide, hydrocarbons

20
Q

there are challenges for management of which greenhouse gases

A

methane, carbon dioxide, etc