Tag: classification of mixtures

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Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Mixture is a physical combination of two or more pure substances.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mixture, a physical combination of two or more pure substances. A mixture is distinguished from a compound, which is formed by the chemical combination of two or more pure substances in a fixed, definite proportion. 

It should be noted that the components of a mixture retain their own chemical properties and may be present in any proportion.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Gunpowder is an example of a__________.

  1. compound

  2. mixture

  3. element

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Gunpowder is an explosive mixture of potassium nitrate, charcoal, and sulphur in ratio 75 : 15: 10 used in time fuses, blasting and fireworks. 
It is obtained by mixing compounds so it is not a compound or an element.
Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

A true solution (or simply a solution) is a homogeneous mixture, in which the solute and solvent molecules cannot be distinguished even under a microscope.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A true solution (or simply a solution) is a homogeneous mixture, i.e., in a true solution, the solute and solvent molecules cannot be distinguished even under a microscope because the size of the particle is very small.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Which among the following statement(s) is/are true?

  1. Brass is an element

  2. Dry ice is a mixture

  3. Aerated drink, e.g., coca cola is a mixture

  4. Diesel is a mixture
Reveal answer Fill a bubble to check yourself
C,D Correct answer
Explanation

A ) Brass is an alloy made of copper and zinc.
B) Dry ice, sometimes referred to as "cardice" (chiefly British chemists), is the solid form of carbon dioxide, so it is a compound.
C) Aerated drink would be anything that would have fizz (gas) filled in it. For example, your pepsi, coke, thums up, mirinda etc.
D) Diesel is mixture of many hydrocarbons.
Options C & D are correct.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

In a mixture, constituents exhibit:

  1. similar properties

  2. only those properties which are characteristic to the mixture.

  3. their own properties

  4. no properties
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Impure substances are commonly called mixtures. A mixture is a material containing two or more elements or compounds that are in close contact and are mixed in any proportion. The constituents of mixtures exhibit their individual properties. These constituents can be separated by physical means.

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

The alloy bronze contains Copper and Tin. This is a:

  1. homogeneous mixture

  2. heterogeneous mixture

  3. solid solution of two immiscible metals

  4. both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Generally, an alloy is a mixture of two or more elements, at least one of which is a metal, and which exhibits metallic bonding characteristics. It may be either homogeneous (eg a solid solution; i.e. single phase; e.g brass) or heterogeneous ( a mixture of metallic phases e. g. Steel— the iron/carbon system) 

Multiple choice chemistry separation of substances classification of mixtures mixtures: examples and properties types of solutions

Column II gives method to separate phases mentioned in column I. Match them and select the correct answer from the codes given below.

Column I Column II
(a) Miscible liquids (p) Distillation
(b) Immiscible liquids (q) Crystallization
(c) Pure copper sulphate  from an impure sample (r) Sublimation
(d) Salt and ammonium chloride (s) Separating funnel

  1. (a) - (q), (b) - (s), (c) - (p), (d) - (r)

  2. (a) - (p), (b) - (s), (c) - (q), (d) - (r)

  3. (a) - (r), (b) - (s), (c) - (p), (d) - (q)

  4. (a) - (r), (b) - (s), (c) - (q), (d) - (p)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sublimation is the transition of a substance directly from the solid to the gas phase without passing through the intermediate liquid phase.
Salt and ammonium chloride can be separated using this.
Crystallization is also a chemical solid-liquid separation technique, in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs.
Pure copper sulphate from an impure sample.
Distillation is a process of separating the component substances from a liquid mixture by selective evaporation and condensation. Distillation may result in essentially complete separation (nearly pure components), or it may be a partial separation that increases the concentration of selected components of the mixture.
A separating funnel is a glass funnel with a tap at the bottom. A separating funnel is a separation technique that is used for two liquids that do not dissolve in each other.