Based on what you know about solutions, suspensions and colloids, what type of mixture do you think clouds are and why?
  • Clouds are colloids because they consist of tiny water droplets dispersed in air.
  • Clouds are solutions because the water is completely dissolved in air.
  • Clouds are suspensions because the water droplets settle out over time.
  • Clouds are pure substances because they contain only water.
Cities with a lot of smoke and dust in the air often look hazy because:
  • Smoke and dust scatter sunlight, making the air appear unclear.
  • The buildings are taller in such cities.
  • There is more water vapor in the air.
  • The temperature is always higher in these cities.
Fill in the blank for Solution: ________
  • homogeneous
  • heterogeneous
  • colloidal
  • suspension
Fill in the blank for Suspension: ________
  • heterogeneous
  • homogeneous
  • colloidal
  • solution
Fill in the blank for Colloid: ________
  • heterogeneous
  • homogeneous
  • solid
  • liquid
Table 5.1: Properties of different types of mixturesProperty: Particle sizeFill in the blank for Solution: ________
  • very small (molecular size)
  • large (visible to naked eye)
  • medium (colloidal size)
  • granular (sand-sized particles)
Table 5.1: Properties of different types of mixtures Property: Particle size Fill in the blank for Suspension: ________
  • large (can be seen with naked eye)
  • small (cannot be seen with naked eye)
  • medium (visible under microscope)
  • very fine (dissolved completely)
Mixtures are classified as ________ or ________ and also as solutions, suspensions, or colloids.
  • homogeneous, heterogeneous
  • solid, liquid
  • organic, inorganic
  • acidic, basic
Separation of mixtures is a crucial process for obtaining pure substances.
  • True
  • False
Crystallization is a technique used to get a pure solid from its ________ solution.
  • saturated
  • unsaturated
  • dilute
  • concentrated
Distillation is used to separate two miscible liquids with a minimum difference of ________ °C in boiling points.
  • 25
  • 5
  • 10
  • 50
Paper chromatography can be used to separate compounds by taking advantage of differences in their rates of movement on the ________.
  • paper
  • glass
  • metal
  • plastic
A separating funnel is used to separate two immiscible liquids based on their different ________.
  • densities
  • boiling points
  • colors
  • melting points
The transition of a solid directly into a vapour (below its melting point) without passing through the liquid state is called ________.
  • sublimation
  • condensation
  • melting
  • evaporation
The process when the vapour cools and changes back into a solid without becoming a liquid is called ________.
  • deposition
  • evaporation
  • condensation
  • sublimation
Centrifugation uses rapid spinning to separate heavier solid particles from a ________ mixture.
  • solid-liquid
  • gas-liquid
  • solid-gas
  • liquid-liquid
Coagulation involves the addition of a substance, called a ________, to make smaller particles clump together and settle down in a heterogeneous mixture of solids and liquids.
  • coagulant
  • solvent
  • diluent
  • reactant
The dispersed particles in a colloid or suspension scatter light, which is known as the ________ effect.
  • Tyndall
  • Brownian
  • Faraday
  • Raman
Which of the following mixtures are correctly classified as homogeneous (Hm) and heterogeneous (Ht)? Choose the correct option.
  • (i) Air — Hm, Milk — Ht, Sugar solution — Hm, Smoke — Hm
  • (ii) Brass — Ht, Fog — Ht, Vinegar — Ht, Muddy water — Hm
  • (iii) Copper sulfate solution — Hm, Salt solution — Hm, Milk — Hm, Bronze — Hm
  • (iv) Muddy water — Ht, Milk — Ht, Blood — Ht, Brass — Hm
A mixture can be categorised as a solution, a suspension, or a colloid, each possessing distinct properties. Utilise the words or phrases provided in the box to fill in the Table 5.2. Words and phrases may be used more than once. Complete the Table 5.2.
  • See Table 5.2 below for answers.
  • Fill in Table 5.2 using only the properties of solutions.
  • Complete Table 5.2 using random words from the box.
  • Use only suspension properties to fill Table 5.2.
What is the term for a mixture in which the composition is uniform throughout?
  • Heterogeneous mixture
  • Compound
  • Homogeneous mixture
  • Suspension
Which separation technique is used to separate a solid from a liquid by passing the mixture through a porous material?
  • Distillation
  • Filtration
  • Evaporation
  • Chromatography
Which separation technique relies on differences in the boiling points of liquids in a mixture?
  • Decantation
  • Magnetic separation
  • Distillation
  • Crystallization
A student has a mixture of sand and iron filings. Which separation technique would be most appropriate to separate these two components?
  • Filtration
  • Distillation
  • Magnetic separation
  • Chromatography
A mixture of salt and water is heated until all the water evaporates. Which separation technique is being used, and what remains after the process?
  • Distillation; water remains
  • Evaporation; salt remains
  • Filtration; salt remains
  • Crystallization; water remains
Paper chromatography is used to separate the components of a mixture. Which property of the components allows them to be separated using this technique?
  • Differences in density
  • Differences in boiling points
  • Differences in solubility and how far they travel with the solvent
  • Differences in magnetic properties
A student needs to separate a mixture of alcohol and water. Which technique should be used, and why is simple evaporation not ideal for this separation?
  • Filtration; because alcohol is insoluble in water
  • Distillation; because alcohol and water have different boiling points, allowing selective vaporization
  • Chromatography; because alcohol and water have different colors
  • Magnetic separation; because alcohol is magnetic
A student has a mixture containing three substances: sand, salt, and iron filings. Design a step-by-step separation plan using appropriate techniques to isolate each component. Which sequence of steps is most logical?
  • Filter to remove salt, then use a magnet for iron filings, then evaporate to get sand
  • Use a magnet to remove iron filings, then dissolve in water and filter to separate sand, then evaporate to recover salt
  • Distill the mixture to remove sand, then filter to remove iron filings, then evaporate to get salt
  • Evaporate the mixture to remove salt, then filter to remove iron filings, then use a magnet to separate sand
A scientist is analyzing a sample of seawater and needs to obtain pure water from it. She also wants to collect the dissolved salts separately. Considering the properties of the components, which combination of techniques would best achieve both goals, and in what order?
  • First filter the seawater, then use chromatography to collect the salts
  • First use distillation to collect pure water as condensed vapor, then evaporate the remaining solution to collect the salts
  • First use magnetic separation to remove salts, then evaporate to collect pure water
  • First use chromatography to separate the water, then filter to collect the salts
Two students are given a mixture of blue and red ink dissolved in water. Student A uses paper chromatography, while Student B uses distillation. Which student will successfully separate the ink colors from each other, and why does the other technique fail for this purpose?
  • Student B; distillation separates colors based on boiling point differences, while chromatography cannot separate dissolved substances
  • Student A; chromatography separates components based on their different rates of travel through the medium, while distillation would only separate water from the inks but not the inks from each other
  • Both students; distillation and chromatography both effectively separate colors in a mixture
  • Neither student; only filtration can separate colored inks dissolved in water
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