Answer key

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Last edited 25 days ago by Learn LoopHQ.

Chapter: 04. Mixtures Separations Of Mixtures

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Deposition is the process where a gas directly changes into its solid state upon cooling, without passing through a liquid phase.

Two examples of homogeneous mixtures are sugar solution and unpolluted air.

Common salt is typically separated from sea water through evaporation, where the seawater is collected in shallow beds and allowed to evaporate under the sun, leaving the solid salt behind.

No, components of a compound cannot be separated by simple physical methods because they are chemically bonded and have lost their individual properties, requiring complex chemical processes for separation.

Alum helps in loading by causing fine solid particles, like clay in muddy water, to clump together and become heavier, which then settle down faster due to increased weight, thus speeding up sedimentation.

Winnowing separates components based on differences in their weight, where lighter components (like husk) are carried away by wind, while heavier components (like grains) fall vertically.

Two examples of heterogeneous mixtures are soil and water in oil.

When choosing a separation method, properties such as size, shape, color, density, melting point, boiling point, solubility, or magnetic nature of the components are considered.

Air is considered a mixture because its components are physically mixed and retain their individual properties, and its composition is not fixed.

In filtration, ‘residue’ is the insoluble solid material that remains on the filter, while ‘filtrate’ is the clean liquid that passes through the filter.

Separation of components from a mixture is necessary to remove undesirable or harmful substances, such as small stones from rice.

A mixture has a variable composition where components can be in any proportion, while a compound has a fixed composition with components present in definite proportions by mass.

A sieve with fine holes is used in the kitchen to separate tea leaves from tea, and a sieve with large holes is used at construction sites to remove stones and pebbles from sand.

The hand-picking method is most suitable for separating components from a mixture when the mixture is in a small quantity, the component to be separated forms a small portion, and the components differ visibly in size, color, or shape.

A pure substance contains only one kind of particle (atom or molecule), whereas an impure substance (mixture) contains two or more pure substances physically combined.

Sediment refers to the heavier, insoluble solid particles that settle at the bottom of a liquid, and supernatant is the clear liquid that remains above these settled particles.

A mixture of iron filings, chalk powder, and common salt requires more than one method for separation, utilizing magnetic separation, dissolution, filtration, and evaporation.

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