2.is matter around us pure Flashcards
What is a solution?
A homogeneous mixture of two or more substances
In a solution of sugar in water, which component acts as the solute?
sugar
What is the main characteristic of a solution?
It is a homogeneous mixture with particles smaller than 1 nm
What term describes a solution that has dissolved as much solute as it can at a given
Saturated solution
In a solution of tincture of iodine, which substance acts as the solvent?
Alcohol
Which of the following correctly describes a dilute solution?
Contains less solute than a concentrated solution
: Which of the following is the largest component in a solution?
Solvent
What is a suspension?
A heterogeneous mixture in which solute particles remain suspended in the medium
Which property differentiates a colloid from a suspension?
Colloid particles do not settle down, while suspension particles do
: What is the Tyndall effect?
he scattering of a beam of light by particles in a colloid
Which method is used to separate colloidal particles from the mixture?
Centrifugation
common example of a colloid?
Milk
What are the components of a colloidal solution called?
Dispersed phase and dispersion medium
Which of the following is a property of colloidal particles?
They scatter a beam of light passing through it
What type of mixture is a suspension?
Heterogeneous
Which of the following properties is NOT considered a physical property of matter?
Inflammability
Which of the following is a characteristic property of metals?
`` Malleable
Which of the following is the only metal that is liquid at room temperature?
Mercury
Which element is NOT classified as a non-metal? A) Carbon
B) Silicon
C) Oxygen
D) Iodine
Silicon
Which of the following is a property of metalloids
Have intermediate properties between metals and non-metals
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
Burning a candle
Which of the following elements is an example of a metalloid? A) Iron
B) Sulfur
C) Boron
D) Neon
boron
Which of the following is a characteristic property of non-metals? A) Malleable
B) Poor conductors of heat and electricity
C) Ductile
D) Sonorous
Poor conductors of heat and electricity
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
Bromine and mercury
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
Gallium and cesium
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
Chemical change
What is a compound?
A substance composed of two or more elements, chemically combined in a fixed proportion
How many naturally occurring elements are there? A) 50
B) 80
C) 92
D) 100
92
What term describes the amount of solute present in a solution
Concentration
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) 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
(d) Different pigments from an extract of flower petals. -
Chromatography
