Question

1.What difference in the property of two miscible liquids enables their separation by fractional distillation?
2.Why is solution not heated to dryness to get crystals?
3.Give one example each of homogeneous and heterogeneous mixture.
4.Name the apparatus by which mixture of oil and water can be separated.
5.How can we check whether the given soli substance is pure or not?
6.A hard substance produces a tinkling sound when beat. Is it metal or a non- metal?
7.Is brass a mixture or a compound?
8.What type of solution is an alloy?
Liquid solution or solid solution
9.A mixture consisting of two miscible liquids 'A' and 'B' whose boiling points differ by 50 C can be separated by which process?
10.Which separation, technique is employed to separate complex mixture of organic compounds like carbohydrates, amino acids. Vitamins, hormones, etc?​

Answer 1

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1)  You separate by distillation. However some compounds such as ethanol and water form an azeotrope. For water:ethanol benzene can be added to “break” the azeotrope or water can be removed by electrolysis.

2) Why is solution not heated to dryness to get crystals ? Ans. Heating the solution to dryness will not remove soluble impurities and crystals of very poor quality are obtained.

3) A mixture is formed by combining two or more materials. A homogeneous mixture appears uniform, regardless of where you sample it. ... Examples of homogeneous mixtures include air, saline solution, most alloys, and bitumen. Examples of heterogeneous mixtures include sand, oil and water, and chicken noodle soup

4) separating funnel

A separating funnel is used to separate the mixture of oil and water.

5) To determine if a substance is pure in school laboratories, we can check the substance's melting or boiling points or use chromatography (see Separation Techniques). A pure solid has a constant/fixed melting point. ie. it will melt completely at one temperature only.

6)  The property by which a metal produces a ringing sound when struck hard is called sonorous property. It is a metal because metals are hard , it is sonorous and can be bent down.

7)   Compounds require chemical bonding, that is not present in simple brass, although many other copper alloys can produce some chemical bonds. So brass is a mixture, although , in practice we classify it as an alloy, because the molten mixture solidifies into a crystal structure on solidification.

8)  Alloy is a solid solution. An alloy is a solid solution, as it contains two metals and metals are solid too.

9)  Distillation Process

A mixture consisting of Two Miscible liquids whose boiling point's differ by 50 degree C can be separated by Distillation Process.

10) CHROMATOGRAPHY

CHROMATOGRAPHY is a separation technique used to separate complex mixture of organic compounds like carbohydrates, amino acids, vitamins, hormones, etc

Answer 2

Question 1:

In order to separate two miscible liquids by fractional distillation there should be a difference in physical property as follows:

• Generally , the boiling points of the two components should be differ by 25°C (45°F).

Question 2:

During crystallization, heating is not performed because it does not help in removal of the impurities. As a result, very poor quality crystals will be obtained.

Question 3:

Example of homogenous mixture is air.

Example of heterogeneous mixture is sand in water.

Question 4:

Oil and water can we separated by a Separating Funnel apparatus.

Question 5:

We can use Archimedes principle how to find out if a solid object is pure or not. After dipping it in water , the volume of water displaced can be used to calculate the density of the solid and then compared to the known density of that kind of material.

Question 6:

Metals have a property of creating tingling noise when beaten with another material. The is created due to vibration of the free surface electrons present in a metal.

Question 7:

Brass is an alloy made by a mixture of various metals.

Question 8:

An alloy is a solid-solid solution.

Question 9:

Since liquid A and B have boiling points differed by 50°C we can easily use distillation in order to separate them.

Question 10:

Chromatography is the technique used to separate bio-micro and bio-macromolecules based on their molecular weight.

Hope It Helps.