Mixtures and Their Types
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Questions and Answers

What is the name given to a mixture where the constituents are evenly spread throughout?

Homogeneous mixture

What type of mixture is a mixture of chalk and water?

Heterogeneous mixture

What are the two properties of a mixture?

The constituents of a mixture may be in any ratio. They retain their individual properties.

The constituents of a mixture do not change when mixed together.

<p>True (A)</p> Signup and view all the answers

Give two examples of separation methods that can be used to separate the constituents of a mixture.

<p>Filtration and evaporation.</p> Signup and view all the answers

It is necessary to remove undesirable constituents from rice before cooking it.

<p>True (A)</p> Signup and view all the answers

Tea leaves are separated from tea by using a strainer.

<p>True (A)</p> Signup and view all the answers

Why is it necessary to separate harmful substances from river water?

<p>Sometimes harmful substances are present in river water. They must be removed before supplying the water to our homes.</p> Signup and view all the answers

Air contains many substances, such as gases, smoke and dust particles.

<p>True (A)</p> Signup and view all the answers

What is the organ in our body that requires oxygen for respiration and separates it from other components?

<p>Lungs</p> Signup and view all the answers

The process of separating unwanted components is already done by the body, so we don't have to do it.

<p>True (A)</p> Signup and view all the answers

How is butter obtained?

<p>Butter can be obtained from milk or curd by churning it.</p> Signup and view all the answers

Crude oil or petroleum is a mixture of several useful constituents

<p>True (A)</p> Signup and view all the answers

How are petrol, kerosene, diesel, tar, etc. obtained?

<p>These are obtained by separating them from crude oil.</p> Signup and view all the answers

Flashcards

Mixture

A substance made up of two or more components mixed together but not chemically combined.

Homogeneous Mixture

Has the same properties throughout, like salt dissolved in water.

Heterogeneous Mixture

Has different properties in different parts, like sand and water.

Ratio of Constituents

The components of a mixture can be present in any amount, like adding more sugar to your coffee.

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Retention of Individual Properties

The substances in a mixture keep their original properties, like sugar still tastes sweet even when mixed with water.

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Separation of Constituents

The components of a mixture can be separated using simple methods like straining or filtering.

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Removal of Undesirable Constituents

Getting rid of unwanted components from a mixture, for example, removing stones from rice.

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Food Preparation

Separating mixtures for food preparation, like removing tea leaves from a cup.

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Medical Applications

Separating mixtures for medical use, like supplying oxygen to patients.

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Obtaining Useful Constituents

Separating useful parts from mixtures, like getting petrol from crude oil.

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Decantation

A method for separating mixtures based on different densities, like separating sand and water.

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Evaporation

A method for separating mixtures based on different boiling points, like separating water and salt.

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Sieving

A method for separating mixtures based on different particle sizes, like separating sand and pebbles.

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Dissolving and Filtration

A method for separating mixtures based on the ability of one component to dissolve in a liquid, like separating sand and salt.

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Magnetic Separation

A method for separating mixtures based on the different magnetic properties of its components, like separating iron filings from sand.

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Centrifugation

A method for separating mixtures based on different densities, like separating cream from milk.

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Chromatography

A method for separating mixtures based on the attraction of different components to a stationary phase, like separating different pigments in ink.

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Distillation

A method for separating mixtures based on the difference in their boiling points, like separating different components in crude oil.

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Sublimation

A method for separating mixtures based on the ability of one component to sublime, like separating camphor from sand.

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Sedimentation

A method for separating mixtures based on the size of the particles, like separating different sizes of sand.

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Study Notes

Mixtures

  • Mixtures are combinations of two or more substances in any ratio.
  • Constituents in a mixture retain their individual properties.
  • Mixture constituents do not change when mixed together.
  • Mixtures can be separated using various methods.

Homogeneous Mixtures

  • Constituents are evenly spread throughout the mixture.
  • All parts of a homogeneous mixture have the same properties.
  • Examples include sugar in water, air.

Heterogeneous Mixtures

  • Constituents are not evenly spread.
  • Different parts of the mixture have different properties.
  • Examples include iron filings and sand, chalk in water, and dusty air.

Separation of Mixtures

  • Separation is needed to remove unwanted components or extract useful ones.
  • Examples:
    • Removing undesirable constituents from food (e.g., stones from rice, leaves from tea)
    • Removing harmful substances from water (e.g., using water filters).
    • Obtaining useful constituents (e.g., butter from milk, petroleum products from crude oil).

Identifying Mixtures/Compounds

  • Comparing boiling points or melting points can reveal whether a substance is a pure compound or a mixture.
  • Pure substances have fixed melting and boiling points.
  • Mixtures of substances have variable melting and boiling points depending on their composition.

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Description

This quiz covers the concepts of mixtures, including homogeneous and heterogeneous types. You'll learn about how the constituents retain their properties and methods for separating them. Explore real-life examples of mixtures and their separation techniques.

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