Tag: pure substance and mixtures

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Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

Mixture is different from a compound. True or false?

  1. True

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

A mixture consists of two or more substances which may be elements, compounds or both mixed together physically in any proportion, but not chemically combined. However, a compound consists of two or more elements that are chemically combined in a fixed proportion. Hence, a compound is different from a mixture.

Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

Which of the following is not a property of mixture?

  1. Does not have a sharp melting or boiling point

  2. Heat is taken in or given out in the preparation

  3. Can be separated by physical means

  4. May be homogeneous or heterogeneous
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The parts of a mixture can be separated by physical means. A mixture does not have a sharp melting or boiling point. It may be homogeneous or heterogeneous. Energy is neither given out nor absorbed in the preparation of a mixture. However, heat is taken in or given out in the preparation of a compound.

Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

Which of the following statement is incorrect?

  1. In compounds components are present in definite proportion whereas in mixtures components are present in varying proportion

  2. Compounds are homogenous whereas mixtures are mostly heterogeneous

  3. Particles in a compound are generally of same kind whereas in mixtures they are of different kind

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All the compounds are made up of different elements and have properties different from their constituent element.

Mixture composed of variant proportion of components.
Hence, all statements are correct.

Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

Which of the following is a characteristic property of both mixtures and compounds?

  1. Their properties are same as those of their components

  2. Energy is released when they are formed

  3. Their masses are equal to the sum of the masses of their components

  4. They contain the components in fixed proportions
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mixture and a compound both follow the law of conservation of mass so their weight equals to the sum of mass of their components.

Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

Ionic compounds have ____ melting and boiling points whereas covalent compounds have _____ melting and boiling point.

  1. low, high

  2. moderate, low

  3. high, low

  4. moderate, high
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ionic compounds consist of strong electrostatic forces between ions, requiring high energy to break, resulting in high melting and boiling points. Covalent compounds consist of molecules held by weaker intermolecular forces, resulting in lower melting and boiling points.

Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

Which of the following can give further simplification using ordinary means?

  1. An element or a mixture

  2. A mixture or a compound

  3. A mixture or an atom

  4. An element or a compound
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A mixture or a compound can give further simplification using ordinary means.


A mixture can be broken into individual components.

A compound can be broken into individual elements.

A substance composed of two or more compounds, each of which retains its own properties is called a mixture.

Hence option B is correct.

Multiple choice chemistry pure substances and mixtures: separation of mixtures difference between mixtures and compounds pure substance and mixtures types of pure substances

In which row are the substances correctly classified?

  1. element - brass; compound - sulfur; mixture - water

  2. element - sulfur; compound - brass; mixture - water

  3. element - sulfur; compound - water; mixture - brass

  4. element - water; compound - sulfur; mixture - brass
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
$\text{1.water is a compound made by combination of hydrogen and oxygen.}$
$\text{2.sulfur is an element.}$
$\text{3.Brass is mixture of elements sulphur and zinc.}$