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A mixture is a combination of two or more substances that retain their individual properties. Mixtures can be homogeneous (uniform composition) or heterogeneous (distinct components). Separation techniques include filtra…
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Explain different methods used for separating mixtures with suitable examples.
Methods include filtration (sand and water), evaporation (salt from saltwater), and chromatography (ink separation).
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How would you separate a mixture of sand, salt and water? Explain the steps.
First, filter the mixture to separate sand, then evaporate the water to obtain salt.
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How would you separate iron filings, sand and salt from a mixture?
Use a magnet to remove iron filings, then filter to separate sand from saltwater, and evaporate to obtain salt.
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A mixture contains two liquids having different boiling points. Which method would you use to separate them? Explain.
Use distillation to separate liquids based on their boiling points.
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Explain how you would obtain pure water from salt water.
Obtain pure water by distillation, where saltwater is heated and water vapor is condensed back into liquid.
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Differentiate between a solution, suspension and colloid.
A solution is homogeneous, a suspension has larger particles that settle, and a colloid has intermediate particle sizes that do not settle.
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Explain sedimentation and decantation.
Sedimentation allows heavier particles to settle at the bottom, and decantation involves pouring off the liquid without disturbing the sediment.
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Explain the process of crystallisation.
Crystallisation is a separation technique where a solute forms crystals as the solution cools or evaporates.
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What is chromatography? Give one use.
Chromatography is a technique for separating mixtures based on different affinities; it is used in ink analysis.
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Why does a colloidal solution show the Tyndall effect?
A colloidal solution shows the Tyndall effect because the dispersed particles scatter light.
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Differentiate between homogeneous and heterogeneous mixtures with examples.
Homogeneous mixtures have uniform composition (e.g., saltwater), while heterogeneous mixtures have distinct components (e.g., salad).
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Why can salt be separated from salt solution by evaporation?
Salt can be separated from a salt solution by evaporation because the water evaporates, leaving the salt behind.
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Why is filtration not suitable for separating dissolved salt from water?
Filtration is not suitable because dissolved salt is at the molecular level and passes through the filter with the water.
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What is the principle of filtration?
The principle of filtration is to separate solids from liquids using a porous barrier.
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How can oil and water be separated?
Oil and water can be separated using a separating funnel due to their different densities.
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What is a mixture?
A mixture is a combination of two or more substances that retain their individual properties.
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What is a homogeneous mixture?
A homogeneous mixture has a uniform composition throughout.
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What is a heterogeneous mixture?
A heterogeneous mixture has distinct components that are not uniformly distributed.
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Define solute and solvent.
A solute is a substance dissolved in a solvent, which is the substance that dissolves the solute.
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What is a solution?
A solution is a homogeneous mixture of two or more substances.
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What is solubility?
Solubility is the ability of a substance to dissolve in a solvent.
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What is a saturated solution?
A saturated solution is one that contains the maximum amount of solute that can dissolve at a given temperature.
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What is a suspension?
A suspension is a heterogeneous mixture where solid particles are dispersed in a liquid.
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What is a colloid?
A colloid is a mixture where fine particles are dispersed in a continuous medium.
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What is the Tyndall effect?
The Tyndall effect is the scattering of light by colloidal particles.
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