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Chemistry Flashcards

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1
Q

Who is known as the father of modern chemistry?

A

Lavoisier

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2
Q

What is matter?

A

Is anything which occupies space and as mass. The five phases of mass are solid liquid gas, plasma, boseEinstein condensate

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3
Q

What is atom?

A

It is a smallest particle of matter that takes part in chemical reactions

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4
Q

What is law of conservation of mass?

A

It can be neither created nor destroyed, example, Iron , gold, silver etc.given by lavoisier

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5
Q

What are molecules?

A

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.

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6
Q

Who has given the law of multiple proportions?

A

Dalton

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7
Q

What is solid?

A

Solid has definite shape, size and volume. example paper wood, et cetera

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8
Q

What is liquid?

A

Liquid have definite volume, but no definite shape, example what are milk, et cetera

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9
Q

What is gas?

A

Yes, have neither definite volume nor definite shape, example, oxygen, hydrogen, et cetera, and all the states of matter or interconvertible

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10
Q

What is an element?

A

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

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11
Q

How many elements are present?

A

118 and out of which 94 are natural elements

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12
Q

Element which are liquid at a room temperature are

A

Mercury, bromine

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13
Q

The order of elements in the human body

A

Oxygen, carbon, hydrogen, nitrogen

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14
Q

The order of elements in the earths surface is

A

Oxygen, silicon, aluminium, iron, and calcium

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15
Q

What is the name of the recently discovered heavy element? Atomic number is 117

A

Ununseptium

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16
Q

What are compounds?

A

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.

17
Q

What is an homogeneous solution?

A

Mixture which have uniform composition throughout the solution, example sugar solution, salt, solution, air, et cetera

18
Q

What is an heterogeneous mixture?

A

The heterogeneous structure are composition have non-uniform composition throughout the entire solution, such as mixture of salt and sugar, colloidal solution.

19
Q

What is boiling point?

A

It is the point at which the vapour pressure of liquid becomes equal to the atmospheric pressure.

20
Q

What is sublimation?

A

Process in which a solid substances convert directly into vapour on application of heat

21
Q

What is the solute?

A

Which is dissolved in a liquid to make a solution is called a solute

22
Q

Solvent

A

Liquid in which the solute is dissolved is called solvent

23
Q

What is a colloidal solution?

A

It is an heterogeneous mixture in which size of solute particles between those in solution and those in suspension

24
Q

What is Tyndall effect?

A

Cordial solution can scatter light because of the presence of large solute Particles is known as Tyndall effect

25
Q

What is brownian movement

A

The separation of solute particles from the colloidal solution using centrifugal force is known as Brownian movement

26
Q

Colloidal solutions are coagulated using

A

Electrolytes

27
Q

Colloidal solutions are purified by

A

Dialysis, which is also used in the purification of blood with the help of artificial kidney machine

28
Q

What is the name of the compound, which is used to purify the water?

A

Alum - xAI(so4).12h20

29
Q

What is the name of the process by which the seawater is desalinated

A

Reverse osmosis

30
Q

What is the name of the chemical compound, which is used to stop the bleeding of blood?

A

Fecl3 - iron chloride

31
Q

What is the name of the effect which causes the blue colour of the sky?

A

Tyndall effect - the dust particles in the air scatter the light does forming a blue colour

32
Q

The concentration of a solution is defined as

A

The mass of solute grams present in hundred grams of solution

Science (11 decks)

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