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Assistant General Science

Chemistry – 05

രാസമാറ്റങ്ങൾ, ലോഹങ്ങൾ അവയുടെ പ്രത്യേകതകൾ എന്നിവയാണ് ഇന്നത്തെ പാഠത്തിൽ ഉൾക്കൊള്ളിച്ചിരിക്കുന്നത്.

  • A change in matter in which no new substances are produced

Physical Change

 

  • A change in matter in which one or more new substances are produced

Chemical Change

 

  • Examples of a chemical change

Burning of wood, Rusting of iron

 

  • Examples of a Physical change

Melting, Freezing, Dissolving

 

  • Elements which may lose electrons in chemical reaction are called

Metals

 

  • Element used in firecrackers to get sparkling red color flame

Strontium

 

  • Element used in firecrackers to get orange color flame

Calcium

 

  • Element used in firecrackers to get green color flame

Barium

 

  • Element used in firecrackers to get yellow color flame

Sodium

 

  • Element stored in oil due to its high reactivity

Barium

 

  • Radioactive element in Alkaline Earth Metals

Radium

 

  • Radioactive liquid element

Francium

 

  • Radioactive gaseous element

Radon

 

  • Naturally occurring compound of Beryllium

Emerald

 

  • Property of metals capable of being drawn into wires is

Ductility

 

  • Property of metals capable of being hammered into very thin sheets is

Malleability

 

  • Property of metals to produce a ringing sound when it stuck with a hard surface

Sonority

 

  • Element which kept in wax

Lithium

 

  • The lightest metal

Lithium

 

  • Densest metal

Osmium

 

  • Hardest Metal

Chromium

 

  • Rainbow metal

Iridium

 

  • The strongest reducing agent

Lithium

 

  • Metals which kept in kerosene due to its high reactivity

Sodium and Potassium

 

  • Elements which are known as soft metals

Sodium and Potassium

 

  • Metal which regulates Blood pressure in human beings

Sodium

 

  • Compound of Sodium which is used as air purifier in submarines and in respiratory equipment

Sodium Peroxide

 

  • Chemicals used in fire extinguishers

Sodium Bicarbonate and Potassium Bicarbonate

 

  • Compound known as Baking Soda

Sodium bicarbonate (NaHCO3)

 

  • Compound known as Washing Soda

Sodium carbonate (Na2CO3)

 

  • Mixture of sodium bicarbonate and Tartaric acid salt

Baking powder

 

  • Compound used as a fixer in photographic films

Hypo (Sodium Thiosulphate)

 

  • Element used as coolant in nuclear reactors

Liquid Sodium

 

  • Chemicals used for purifying water

Potassium Permanganate (KMnO4)

 

  • Metal, related to arthritis

Potassium

 

  • Chemicals used in organic farming for neutralizing acidic soil

Potassium bicarbonate

 

  • Raw material which is used in cement manufacturing

Limestone

 

  • Compound which is used to regulate the setting time of cement

Gypsum

 

  • Perl is composed of

Calcium carbonate and Magnesium Carbonate

 

  • Perl is soluble in

Vinegar

 

  • Gas released when heating limestone

Carbon Dioxide

 

  • Gas which turns Milk of lime into Milky color

Carbon Dioxide

 

  • Coral reefs are composed of

Calcium Carbonate

 

  • Compound contained in Bone mineral

Calcium Phosphate

 

  • Compound used for the dehydration of gases

Calcium oxide

 

  • Chemical name of bleaching powder

Calcium hypochlorite


(To be Continued…)