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9 - science > 2.is matter around us pure > Flashcards

2.is matter around us pure Flashcards

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1
Q

What is a solution?

A

A homogeneous mixture of two or more substances

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2
Q

In a solution of sugar in water, which component acts as the solute?

A

sugar

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3
Q

What is the main characteristic of a solution?

A

It is a homogeneous mixture with particles smaller than 1 nm

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4
Q

What term describes a solution that has dissolved as much solute as it can at a given

A

Saturated solution

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5
Q

In a solution of tincture of iodine, which substance acts as the solvent?

A

Alcohol

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6
Q

Which of the following correctly describes a dilute solution?

A

Contains less solute than a concentrated solution

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7
Q

: Which of the following is the largest component in a solution?

A

Solvent

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8
Q

What is a suspension?

A

A heterogeneous mixture in which solute particles remain suspended in the medium

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8
Q

Which property differentiates a colloid from a suspension?

A

Colloid particles do not settle down, while suspension particles do

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9
Q

: What is the Tyndall effect?

A

he scattering of a beam of light by particles in a colloid

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10
Q

Which method is used to separate colloidal particles from the mixture?

A

Centrifugation

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10
Q

common example of a colloid?

A

Milk

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11
Q

What are the components of a colloidal solution called?

A

Dispersed phase and dispersion medium

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12
Q

Which of the following is a property of colloidal particles?

A

They scatter a beam of light passing through it

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13
Q

What type of mixture is a suspension?

A

Heterogeneous

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14
Q

Which of the following properties is NOT considered a physical property of matter?

A

Inflammability

15
Q

Which of the following is a characteristic property of metals?

A

`` Malleable

16
Q

Which of the following is the only metal that is liquid at room temperature?

A

Mercury

17
Q

Which element is NOT classified as a non-metal? A) Carbon
B) Silicon
C) Oxygen
D) Iodine

A

Silicon

18
Q

Which of the following is a property of metalloids

A

Have intermediate properties between metals and non-metals

19
Q

Which of the following examples illustrates both physical and chemical changes taking place?
A) Melting ice
B) Dissolving salt in water
C) Burning a candle
D) Freezing water

A

Burning a candle

20
Q

Which of the following elements is an example of a metalloid? A) Iron
B) Sulfur
C) Boron
D) Neon

A

boron

21
Q

Which of the following is a characteristic property of non-metals? A) Malleable
B) Poor conductors of heat and electricity
C) Ductile
D) Sonorous

A

Poor conductors of heat and electricity

22
Q

Which of the following elements are liquid at room temperature? A) Mercury and cesium
B) Gallium and cesium
C) Mercury and bromine
D) Bromine and sulfur

A

Bromine and mercury

23
Q

Which elements become liquid at a temperature slightly above room temperature (303 K)?]
A) Gallium and cesium
B) Bromine and sulfur
C) Iron and copper
D) Hydrogen and oxygen

A

Gallium and cesium

24
Q

C) What type of change occurs when iron filings and sulfur powder are heated together?
A) Physical change
B) State change
C) Chemical change
D) Mixture formation

A

Chemical change

25
Q

What is a compound?

A

A substance composed of two or more elements, chemically combined in a fixed proportion

26
Q

How many naturally occurring elements are there? A) 50
B) 80
C) 92
D) 100

A

92

27
Q

What term describes the amount of solute present in a solution

A

Concentration

28
Q

Which separation techniques will you apply for the separation of the following?

(a) Sodium chloride from its solution in water.
(b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
(c) Small pieces of metal in the engine oil of a car.
(d) Different pigments from an extract of flower petals.
(e) Butter from curd.
(f) Oil from water.
(g) Tea leaves from tea.
(h) Iron pins from sand.
(i) Wheat grains from husk.
(j) Fine mud particles suspended in water.

A

(a) Sodium chloride from its solution in water. - Evaporation

(b) Ammonium chloride from a mixture containing sodium chloride and ammonium chloride. - Sublimation

(c) Small pieces of metal in the engine oil of a car. - Filtration

(d) Different pigments from an extract of flower petals. - Chromatography

(e) Butter from curd. - Centrifugation

(f) Oil from water. - Separating Funnel

(g) Tea leaves from tea. - Filtration

(h) Iron pins from sand. - Magnetic Separation

(i) Wheat grains from husk. - Winnowing

(j) Fine mud particles suspended in water. - Sedimentation →Loading →Filtration

29
Q

(d) Different pigments from an extract of flower petals. -

A

Chromatography

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