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Assistant General Science

Chemistry – 04

രാസപ്രവർത്തനങ്ങൾ, ഏറ്റവും കൂടുതൽ കാണപ്പെടുന്ന മൂലകങ്ങൾ എന്നിവയുമായി ബന്ധപ്പെട്ട ചോദ്യങ്ങളാണ് ഇന്നത്തെ പാഠത്തിൽ ഉൾപ്പെടുത്തിയിരിക്കുന്നത്.

  • Substances that present in a chemical reaction which reacts together to form a product

Reactants

 

  • Final substances that are formed from a chemical reaction

Products

 

  • A substance that speeds up a chemical reaction

Catalyst

 

  • A chemical reaction in which heat is released

Exothermic reactions

 

  • A chemical reaction in which heat is absorbed

Endothermic reactions

 

  • A chemical reaction that involves the loss of electrons

Oxidation

 

  • A chemical reaction that involves the gain of electrons

Reduction

 

  • Ability of an atom to accept the electrons is known as

Electronegativity

 

  • Electronegativity was discovered by

Linus Pauling

 

  • Electronegativity scale was discovered by

Linus Pauling

 

  • Ability of an atom to donate the electrons is known as

Electropositivity

 

  • Union of atoms of two or more elements by mutual attraction

Chemical bond

 

  • A bond formed by transferring electrons from one atom to another is called

Ionic Bond

 

  • A bond formed by sharing of electrons between the atoms is called

Covalent Bond

 

  • Combining capacity of an atom to another is called

Valancy

 

  • A process in which solid turns straight into a gas

Sublimation

 

  • Examples of Sublimation

Naphthalene, Camphor

 

  • A process in which gas turns into solid

Deposition

 

  • A process in which liquid turns into gas

Vaporization

 

  • A process in which gas turns into liquid

Condensation

 

  • A process in which solid turns into liquid

Melting

 

  • A process in which liquid turns into solid

Freezing

 

  • Method for separating metals having low melting point

Liquation

 

  • Device in which electricity produced at cost of chemical reaction by oxidation-reduction process is known as

Electrochemical cell

 

  • Process of heating the ore below its melting point in the absence of air to remove volatile impurities like Arsenic called

Calcination

 

  • Method to separate a mixture of colored compounds

Chromatography

 

  • Deposition of a metal on another by electric current is called

Electroplating

 

  • Chemical reaction in which a substance reacts with water

Hydrolysis

 

  • Chemical decomposition by the action of heat is known as

Pyrolysis

 

  • Process of heating milk to 72 degrees about 16 seconds and then cooling it to 4 degrees to destroy harmful bacteria is called

Pasteurization

 

  • Method of separating a substance from a mixture of liquids having different boiling points

Distillation

 

  • Most abundant element in Earth crust

Oxygen (46.6%)

 

  • Second most abundant element in Earth crust

Silicon (27.7%)

 

  • Third most abundant element in Earth crust

Aluminium (8.3%)

 

  • Most abundant element in atmosphere

Nitrogen (78%)

 

  • Second most abundant element in atmosphere

Oxygen (21%)

 

  • Third most abundant element in atmosphere

Argon (0.9%)

 

  • Most abundant element in universe

Hydrogen

 

  • Most abundant element in human body

Oxygen

 

  • Most abundant metal in human body and developed animals

Calcium

 

  • Most abundant metal in Earth Crust

Aluminium

 

  • Most abundant metalloid in Earth Crust

Silicon

 

  • Most abundant element in seawater

Chlorine

 

  • Most abundant metal in bones

Calcium

 

  • Most abundant metal compound in bones

Calcium phosphate

 

  • Most abundant compound on Earth’s surface

Water

 

  • Most abundant compound in seawater

Sodium Chloride

 

  • Second most abundant compound in seawater

Magnesium Chloride

 

  • Second most abundant compound in Earth crust

Magnesium Oxide


(To be Continued…)