Methods Of Separation: Chemistry Quiz

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  • 1/15 Questions

    Find the Rf value if y (start line-solvent front) is 10cm and the x (start line-spot) is 5cm.

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About This Quiz

Explore the Methods of Separation in Chemistry through this engaging quiz. Master techniques like filtration, fractional distillation, and crystal formation. Perfect for learners aiming to understand practical and theoretical aspects of chemical separation.

Methods Of Separation: Chemistry Quiz - Quiz

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  • 2. 

    Why is the colored spot not placed below the solvent level during chromatography?

    • Waste time

    • No effect

    • For fun

    • Dye will dissolve

    Correct Answer
    A. Dye will dissolve
    Explanation
    The colored spot is not placed below the solvent level during chromatography because the dye will dissolve in the solvent and move up the chromatography paper. Placing the spot below the solvent level would prevent the dye from dissolving and hinder its movement, resulting in inaccurate results.

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  • 3. 

    During filtration, the soild collected in the filter paper is called the_______.

    • Filtrate

    • Rubbish

    • Residue

    • Solid

    Correct Answer
    A. Residue
    Explanation
    During filtration, the solid collected in the filter paper is called the residue. This is because filtration is a process used to separate solids from liquids or gases, and the solid material that remains on the filter paper after the liquid or gas has passed through is referred to as the residue.

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  • 4. 

    Methods of separation for the components of liquid-liquid. (miscible)

    • Dissolution

    • Filtration

    • Evaporation

    • Fractional distillation

    Correct Answer
    A. Fractional distillation
    Explanation
    Fractional distillation is the correct answer because it is a method used to separate the components of a liquid-liquid mixture that are miscible. Miscible liquids are those that can mix together in any proportion. In fractional distillation, the mixture is heated, and the vapors of the different components have different boiling points. The vapors are then condensed and collected separately, resulting in the separation of the components based on their boiling points. This method is commonly used in industries such as petroleum refining to separate different components of crude oil.

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  • 5. 

    Sublimation refers to change of state of a substance from _______ to _______.

    • solid-liquid

    • Solid-gas

    • Liquid-gas

    • Gas-solid

    Correct Answer
    A. Solid-gas
    Explanation
    Sublimation is the process in which a substance changes directly from a solid state to a gas state, without going through the intermediate liquid state. Therefore, the correct answer is solid-gas.

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  • 6. 

    .If you want to use separating funnel to separate oil and water, what is the substance remain in the funnel after the experiment?

    • oil

    • Water

    • Oil and water

    • Nothing

    Correct Answer
    A. oil
    Explanation
    After using a separating funnel to separate oil and water, the substance that remains in the funnel is the oil. The separating funnel is designed to separate immiscible liquids, such as oil and water, based on their different densities. Since oil is less dense than water, it will float on top and can be easily separated by draining it out of the funnel. Therefore, after the experiment, only the oil will be left in the funnel.

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  • 7. 

    What are the two methods of paper chromatography?

    • ascending and unscending

    • Descending and insecending

    • Ascending and descending method

    • Done above

    Correct Answer
    A. Ascending and descending method
    Explanation
    Ascending and descending methods are the two methods of paper chromatography. In ascending paper chromatography, the solvent is placed in a container and the paper is immersed in it, allowing the solvent to travel up the paper. This method is commonly used for separating pigments. On the other hand, in descending paper chromatography, the solvent is placed at the top of the paper and allowed to flow down, separating the components of a mixture. This method is often used for analyzing amino acids and other organic compounds.

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  • 8. 

    To obtain a solute by crystallization method, the solubility of the solute must varies a lot with __________.

    • Volume

    • Speed

    • Nothing

    • Temperature

    Correct Answer
    A. Temperature
    Explanation
    The solubility of a solute must vary a lot with temperature in order to obtain it by the crystallization method. Crystallization involves dissolving a solute in a solvent and then allowing the solution to cool or evaporate, causing the solute to crystallize out. If the solubility of the solute does not change significantly with temperature, it would be difficult to separate the solute from the solvent through crystallization. Therefore, temperature is a crucial factor in determining whether the crystallization method can be used effectively.

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  • 9. 

    .Methods of separation for the components of solid-liquid.

    • Dissolution

    • Filtration

    • Evaporation

    • Fractional distillation

    Correct Answer
    A. Filtration
    Explanation
    Filtration is a method of separation for the components of solid-liquid mixtures. It involves passing the mixture through a filter, which allows the liquid to pass through while retaining the solid particles. This separation technique is commonly used when the solid particles are larger in size and cannot dissolve in the liquid. The solid particles are collected on the filter, while the liquid passes through and is collected separately. Filtration is an effective method for separating solid impurities from liquids.

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  • 10. 

    Methods of separation for the components of liquid-liquid. (immiscible)

    • Separating funnel

    • Filtration

    • Evaporation

    • Distillation

    Correct Answer
    A. Separating funnel
    Explanation
    The most appropriate method for separating the components of immiscible liquid-liquid mixtures is the "separating funnel." This method takes advantage of the difference in density between the two liquids, allowing them to form distinct layers in the funnel. The less dense liquid rises to the top, and the denser liquid settles at the bottom. By opening the stopcock at the bottom of the funnel, one liquid can be drained into a separate container, leaving the other behind. This method is specifically designed for separating immiscible liquids.

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  • 11. 

    During distillation, what are the little particles in the water?

    • Solid

    • Boiling chips

    • Glass

    • Stone

    Correct Answer
    A. Boiling chips
    Explanation
    During distillation, boiling chips are added to the water to provide nucleation sites for the formation of bubbles. These chips are small, porous stones or glass pieces that have a high surface area, allowing for efficient boiling and vaporization of the liquid. They prevent superheating and bumping by creating a controlled release of gas bubbles, ensuring a smooth and safe distillation process.

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  • 12. 

    And which one will show the result first?

    • Ascending

    • Descending

    • Unscending

    • Inscending

    Correct Answer
    A. Descending
    Explanation
    The correct answer is "Descending" because it refers to a sequence or order in which the values or numbers are arranged in decreasing order. In other words, it means that the result will be shown from the highest value to the lowest value.

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  • 13. 

    What are the methods used if you want to separate two solids of different solubility in a particular solvent?

    • Dissolution

    • Filtration

    • Evaporation

    • Crystallization

    • All above

    Correct Answer
    A. Crystallization
    Explanation
    Crystallization is the method used to separate two solids of different solubility in a particular solvent. In this process, the solvent is evaporated slowly, causing the solute to form crystals. The crystals can then be separated from the remaining liquid through filtration or decantation.

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  • 14. 

    ________ separates a dissolved solid from a solution as well-formed crystals.

    • Dissolution

    • Filtration

    • Evaporation

    • Distillation

    Correct Answer
    A. Distillation
    Explanation
    Distillation is the process of separating a dissolved solid from a solution by heating the solution to create vapor, which is then condensed and collected as a separate liquid. This method is used to separate substances based on their different boiling points. In the context of the given question, distillation is the most suitable method for separating dissolved solids from a solution as it allows for the formation of well-formed crystals.

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  • 15. 

    Methods of separation for the components of solid-solid.

    • Dissolution

    • Filtration

    • Evaporation

    • Crystallization

    • All above

    Correct Answer(s)
    A. Filtration
    A. Crystallization
    Explanation
    The methods for separating components in solid-solid mixtures are filtration and crystallization. Filtration involves passing the mixture through a filter to separate smaller solid particles from larger ones. Crystallization is used when components have different solubilities; the mixture is dissolved, and as the solvent evaporates, less soluble components crystallize out as solid crystals. Dissolution and evaporation are typically used for solid-liquid mixtures, not solid-solid separation.

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  • Current Version
  • Oct 12, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Mar 26, 2010
    Quiz Created by
    Felixpiers
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