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chemistry > is matter around us pure? > Flashcards

is matter around us pure? Flashcards

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1
Q

pure substance-

A

all the constituent particles of that substance are the same in their chemical nature

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2
Q

mixtures-

A

more than one kind of pure form of matter

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3
Q

solution-

A

it is a homogeneous mixture of 2 or more substances

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4
Q

mixtures have _________composition

A

variable

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5
Q

what are alloys?

A

mixtures of 2 or more metals or a metal and a non-metal

cannot be separated by physical methods

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6
Q

brass composition-

A

30%zinc 70%copper

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7
Q

a solution is made of _______ and _________

A

solute and solvent

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8
Q

what is a solvent?

A

the component of the solution that dissolves the other component in it (usually present in larger amount) is called the solvent

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9
Q

solute-

A

the component of the solution that is dissolved in the solvent (usually present in a smaller quantity) is called solute

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10
Q

the size of the particles of a solution are _______ in size

A

smaller than 1 nm

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11
Q

a solution __________a beam of light

A

does not

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12
Q

a solution is ________ (stable/unstable)

A

stable

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13
Q

a solution cannot be seperated by _______

A

filteration

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14
Q

saturated solution-

A

at any particular temperature, a solution that has dissolved as much solute as it is capable of dissolving is called a saturated solution

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15
Q

solubillity is-

A

the amount of solute present in the saturated solution at this temperature is called its solubility

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16
Q

unsaturated solution is-

A

amount of solute contained in a solution is less than the saturation level it is called unsaturated solution.

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17
Q

different _________ in a given solvent have different ___________at the same temperature

A

substances, solubilities

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18
Q

a suspension is a __________ (homogeneous/heterogenous)

A

heterogenous

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19
Q

what is a suspension?

A

when solute particles do not dissolve but remain suspended through the bulk of the medium

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20
Q

the particles of a suspension __________(are/are not) visible to the naked eye

A

are visible

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21
Q

the particles of a suspension _________a beam of light

A

scatter

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22
Q

a suspension is __________(stabke/unstable)

A

unstable (particles settle down)

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23
Q

a suspension can be separated through filtration- (true false)

A

true

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24
Q

a colloidal solution is _______ spread throughout the solution

A

uniformly

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25
Q

a collidal solution is a _________ mixture(homogeneous/heterogenous)

A

heterogenous

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26
Q

a collidal solution has relatively ______particles which _____ be see through a naked eye (can/cannot)

A

small particles, cannot

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27
Q

a collidal solution _________(does/does not) scatter a beam of light

A

does

28
Q

a collidal solution is _______(stable/unstable)

A

stable

29
Q

what is tyndall effect?

A

scattering of a beam of light

30
Q

heterogeneous -

A

non uniform throughout, can be serpated by physical methods

31
Q

homogenous is-

A

uniform throughout

32
Q

how can dye be separated from blue/black ink?

A

by evaporation

33
Q

how to separate cream from milk?

A

centrifugation

34
Q

how to seperate mixture of 2 immicible liquids like kerosene oil and water?

A

seperating funnel

35
Q

how to seperate mixture of salt and camphor?

A

sublimation

36
Q

how to know if dye in black ink a single colour?

A

chromatography

37
Q

what is chromatography?

A

separation of solutes that dissolve in the same solvent

38
Q

how to seperate mixture of 2 miscible liquids?

A

distillation

39
Q

when is simple distillation used?

A

when there is a sufficient difference in the boiling points

40
Q

when is fractional distillation used?

A

when the difference in boiling points is less than 25 degree kelvin

41
Q

what is a fractioning coloumn?

A

it is a tube packed with glass beads

the beads provide surface for vapors to cool and condense

42
Q

how to compress air?

A

increasing pressure and decreasing temperature

43
Q

how to seperate pure copper sulphate from an impure sample?

A

crystallisation

44
Q

when is crystallisation used?

A

to purify solids

45
Q

how was the first scientist to use the term ‘element’ and when?

A

robert boyle, in 1661

46
Q

who was the man who defined element?

A

Antoine laurent lavoisier

47
Q

what it is an element?

A

a basic form of matter that cannot be broken down into simpler substances by chemical reaction

48
Q

what is a compound?

A

it is a substance composed of two or more element chemically combined with one another in a fixed proportion

49
Q

simplest form of compounds

A

molecules

50
Q

a liquid non metal at room temperature

A

bromine

51
Q

what is concentrated solution?

A

solution with high solute concentration

52
Q

hydrogen gas is -

A

colourless, odourless, combustible

53
Q

size of particles in a collide are-

A

between 1nm and 100nm

54
Q

size of particles of a suspension are-

A

greater than 100 nm

55
Q

what are aquenous solutions?

A

when the solvent is water, the solution is known as aquenous solution

56
Q

what are non-aquenous solutions?

A

when the solution is any other liquid other than water then the solution is known as non aquenous solution

57
Q

the continous zig zag movement of collidal particles in a dispersion medium is called?

A

brownian movement

58
Q

how many types of collides are there?

A

8

59
Q

how to separate a colloidal solution?

A

centrifugation

60
Q

gas + liquid=

A

foam (shaving cream)

61
Q

liquid +liquid=

A

emulsion (milk,face cream)

62
Q

solid +liquid=

A

sol (milk of magnesia, mud)

63
Q

gas+solid=

A

foam (rubber, sponge)

64
Q

solid +solid=

A

solid sol (colored gemstone, milky glass)

65
Q

liquid+solid=

A

gel (jelly, cheese, butter)

66
Q

liquid+gas=

A

aerosol (fog,clouds,mist)

67
Q

solid+gas=

A

aerosol (smoke, automobile exhaust)

chemistry (1 decks)

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