Question

     An alloy is a mixture of a solid in ___________.
2.     A ___________substance is made of same kind of elements.
3.     A ___________is a homogenous mixture of two or more substances.
4.     Solubility of a gas always___________ with increase in temperature.
      
5.     ___________are classified according to the state of dispersed phase and dispersion phase.
6.     A colloidal with liquid as both dispersed phase and dispersion medium is called
7.     A/ an___________ does not show Tyndall effect.
8.     ___________is the principle of separation used in diagnostic labs for blood and urine tests.
9.     The separation of a mixture of camphor and sodium chloride involves the principle of ___________ to separate.
10.  Gas molecules at higher temperature have more___________ at lower temperature. 
11.  ___________of air is used in the separation of Oxygen, liquid nitrogen and argon from air.
12.  A colloid with liquid as dispensed phase and gas as dispersion medium is___________.
13.  A compound can be separated into constituent elements by ___________methods.
14.  ___________method is used to obtain the pure crystals of copper sulphate from its saturated solution.
15.  Boron, germanium and silicon are the best examples of______. class 9 lesson is matter around us is pure? answer it​

Answer 1

Answer:

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Explanation:

1. An alloy is a mixture or metallic solid solution composed of two or more elements. An alloy's properties are usually different from those of its component elements. Alloy constituents are usually measured by mass.

2. An element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing a single proton and a single electron.

3. A homogeneous mixture of two or more substances.

4. The gas molecules in a liquid are dissolved by the process of dissolution. As we know that dissolution is an exothermic process, the solubility should decrease with an increase in temperature to validate Le Chatelier’s Principle.

5. A colloid is a mixture in which one substance which has fine particles (dispersed phase) mixed into another substance (dispersion medium). ... The substances which are dispersed in the solution are called the dispersed phase, and the solution in which it is dispersed is called dispersion medium.

6. Emulsions are the colloidal solutions of two immiscible liquids in which one liquid acts as the dispersed phase and the other as the dispersion medium. In emulsion, the suspended droplets (dispersed phase) are larger than the particles of dispersion medium.

7. A mixture in which one material is divided into tiny particles (known as colloidal particles) and distributed in a second. ... True solutions therefore do not exhibit Tyndall influence, as the particle is not large enough to disperse the light incident on it.

8. In centrifugation, the mixture is spun at high speed and the denser particles are forced to the bottom and lighter stay at the top. This method is used in diagnostic laboratories for blood and urine tests.

9. To separate the components of a mixture of sand, common salt and ammonium chloride (or camphor) by sublimation.

10. At higher temperatures, therefore, the molecules of a gas move more rapidly than at lower temperatures, and vp increases. At a given temperature, all gaseous particles have the same average kinetic energy but not the same average speed.

11. They use a method called Fractional Distillation Method to produce pure oxygen from atmospheric air, which consists mostly of nitrogen and oxygen - 78% nitrogen, 21% oxygen and remaining 1% other gases including argon, carbon dioxide, neon, helium, and hydrogen.

12. Colloids also show the property of the Tyndall effect which is defined as the scattering of light by particles in the colloid. The colloidal system with dispersed phase as a liquid while dispersion medium as gas is cloud.

13. Compounds can be broken down into their constituent elements by chemical changes. A chemical change (that is, a chemical reaction) is one in which the organization of the atoms is altered.

14. Copper sulphate can be obtained from an impure sample by crystallisation. The impurities will remain in the mother liquor whereas the pure copper sulphate will crystallize out.

15. Metalloid is a chemical element having properties in between or a mixture of both metals and non-metals.  

The six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony and tellurium.

Answer 2

• An alloy is a mixture of a solid in ____solid_______.
• 2.     A ___homoatomic________substance is made of the same kind of elements.
• 3.     A ___fine solution________is a homogenous mixture of two or more substances.
• 4.     Solubility of gas always____increases_______ with an increase in temperature.

      

• 5.     ______Collodis_____are classified according to the state of dispersed phase and dispersion phase.
• 6.     A colloidal with liquid as both dispersed phase and dispersion medium is called suspension.
• 7.     A/ an____homogeneous solution _______ does not show the Tyndall effect.
• 8.     __Centrifugation_________is the principle of separation used in diagnostic labs for blood and urine tests.
• 9.     The separation of a mixture of camphor and sodium chloride involves the principle of ____evaporation_______ to separate.
• 10.  Gas molecules at higher temperatures have more____volume than_______ at lower temperatures. 
• 11.  __Fractional distillation _________of air is used in the separation of Oxygen, liquid nitrogen and argon from the air.
• 12.  A colloid with liquid as dispensed phase and gas as dispersion medium is___cloud________.
• 13.  A compound can be separated into constituent elements by ___separation________methods.
• 14.  ____Crysallisation_______method is used to obtain the pure crystals of copper sulphate from its saturated solution.
• 15.  Boron, germanium and silicon are the best examples of_metalloids_____.