Chemistry Flashcards
Who is known as the father of modern chemistry?
Lavoisier
What is matter?
Is anything which occupies space and as mass. The five phases of mass are solid liquid gas, plasma, boseEinstein condensate
What is atom?
It is a smallest particle of matter that takes part in chemical reactions
What is law of conservation of mass?
It can be neither created nor destroyed, example, Iron , gold, silver etc.given by lavoisier
What are molecules?
It is the smallest particle of an element or compound, which is properties of that substance and can exist in free state. They are formed by two or more atoms in fixed ratio. Example H2O.
Who has given the law of multiple proportions?
Dalton
What is solid?
Solid has definite shape, size and volume. example paper wood, et cetera
What is liquid?
Liquid have definite volume, but no definite shape, example what are milk, et cetera
What is gas?
Yes, have neither definite volume nor definite shape, example, oxygen, hydrogen, et cetera, and all the states of matter or interconvertible
What is an element?
An element is a substance which cannot be split up into two or more simple substances by the usual chemical methods of applying heat light or electrical energy
How many elements are present?
118 and out of which 94 are natural elements
Element which are liquid at a room temperature are
Mercury, bromine
The order of elements in the human body
Oxygen, carbon, hydrogen, nitrogen
The order of elements in the earths surface is
Oxygen, silicon, aluminium, iron, and calcium
What is the name of the recently discovered heavy element? Atomic number is 117
Ununseptium
What are compounds?
Compounds contain more than one kind of atoms. These cannot be separated into constituent atoms by simple physical methods. Example silica SI O2 and water H2O.
What is an homogeneous solution?
Mixture which have uniform composition throughout the solution, example sugar solution, salt, solution, air, et cetera
What is an heterogeneous mixture?
The heterogeneous structure are composition have non-uniform composition throughout the entire solution, such as mixture of salt and sugar, colloidal solution.
What is boiling point?
It is the point at which the vapour pressure of liquid becomes equal to the atmospheric pressure.
What is sublimation?
Process in which a solid substances convert directly into vapour on application of heat
What is the solute?
Which is dissolved in a liquid to make a solution is called a solute
Solvent
Liquid in which the solute is dissolved is called solvent
What is a colloidal solution?
It is an heterogeneous mixture in which size of solute particles between those in solution and those in suspension
What is Tyndall effect?
Cordial solution can scatter light because of the presence of large solute Particles is known as Tyndall effect
