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Matter and Its Composition Test - 3

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Matter and Its Composition Test - 3
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  • Question 1
    1 / -0

    Who developed a theory that “Matter is made up of small discrete particles which are like solid balls”?

    Solution

    Dalton developed an atomic theory that is still mostly accepted today. It is one of the most important theories in all of science. Dalton thought individual atoms were solid, hard spheres, so he modeled them with wooden balls.

  • Question 2
    1 / -0

    Why crystallisation is a good process than evaporation for dryness?

    Solution

    Crystallization is better than evaporation because during Evaporation Some solids decompose or some, like sugar, may get charred on heating to dryness. Some impurities may remain dissolved in the solution even after filtration which on evaporation contaminates the solid.

  • Question 3
    1 / -0

    Which of the following is related to diffusion?

    Solution

    Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. It happens in liquids and gases because their particles move randomly from place to place. It is an important process for living things; it is how substances move in and out of cells.

  • Question 4
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    Which of the following phenomenon is used for breaking two or more dissolved solids which are present in a solution in very small quantities?

    Solution

    Two or more dissolved solids present in a solution in very small amounts can be separated and identified by chromatography. Though these substances are soluble in the same solvent, yet their solubility may different.

  • Question 5
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    Due to which of the following apparatus mixture of an immiscible liquid can be separated?

    Solution

    Separating immiscible liquids is done simply using a separating funnel. The two liquids are put into the funnel and are left for a short time to settle out and form two layers. The tap of the funnel is opened and the bottom liquid is allowed to run. The two liquids are now separate.

  • Question 6
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    What is the another name of explaining the natural process?

    Solution

    Scientific theories are constructed in order to explain, predict, and understand phenomena. This could include explanations for the movement of planets, weather patterns, or the behavior of animals.

  • Question 7
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    Which one has the particles closed together in a regular pattern?

    Solution

    In solids, the particles are arranged in a regular pattern. They are held together by strong forces. This is why solids have a fixed shape. You cannot squash or change the volume of solids.

  • Question 8
    1 / -0

    Due to gaining which of the following, the vibration in particles are to be seen as the solids are heated?

    Solution

    In a solid, the strong attractions between the particles hold them tightly packed together. Even though they are vibrating this is not enough to disrupt the structure. When a solid is heated the particles gain energy and start to vibrate faster and faster.

  • Question 9
    1 / -0

    Fe is the symbol for

    Solution

    Iron is a chemical element with symbol Fe and atomic number 26. Classified as a transition metal, Iron is a solid at room temperature.

  • Question 10
    1 / -0

    Which of the following point change solid state into liquid?

    Solution

    The solid begins to go from a solid-state to a liquid state — a process called melting. The temperature at which melting occurs is the melting point (mp) of the substance.

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