Chemistry 5

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 for a chemical change

                 Burning of wood, Rusting of iron

• Examples for a Physical change

                 Melting, Freezing, Dissolving

• Elements which may loose electrons in chemical reaction are called

                 Metals

• Element used in fire crackers to get sparkling red color flame

                 Strontium

• Element used in fire crackers to get orange color flame

                 Calcium

• Element used in fire crackers to get green color flame

                 Barium

• Element used in fire crackers to get yellow color flame

                 Sodium

• Element stored in oil due to its high reactivity

                 Barium

• Radio active element in Alkaline Earth Metals

                 Radium

• Radio active liquid element

                 Francium

• Radio active 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 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 equipments

                 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)

• Metals related to arthritis

                 Potassium

• Chemicals used in organic farming for neutralizing acidic soil 

                 Potassium bicarbonate

• Raw material which is used in cement manufacturing

                 Lime stone

• 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 lime stone

                 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...)