Explore

Practice Sheets

Practice Paper

Prepared by: learnloophq@gmail.com

Last edited 25 days ago by Learn LoopHQ.

Answer key

Chapter: 04. Mixtures Separations Of Mixtures

⁠

Mixtures — Separation Of Mixtures: Practice Exam

Student Name: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Date: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Instructions: Read each question carefully and answer to the best of your ability.

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I. Multiple Choice Questions (MCQs)

Which of the following is an example of a pure substance? a) Air b) Milk c) Sugar d) Honey

A mixture where components are uniformly mixed and cannot be seen separately is called: a) Heterogeneous mixture b) Impure substance c) Homogeneous mixture d) Compound

Which property of a mixture is NOT true? a) Its components retain their individual properties. b) It does not have a fixed melting point. c) It is a pure substance. d) Its composition can vary.

The method used to separate lighter husk from heavier grains by wind is: a) Hand-picking b) Sieving c) Winnowing d) Magnetic separation

What is the term for a solid changing directly into a gas upon heating? a) Evaporation b) Condensation c) Deposition d) Sublimation

Which of these is used to help fine, light solid particles settle faster in muddy water? a) Filter paper b) Alum c) Magnet d) Strainer

When a mixture of sand and water is left undisturbed, sand settles at the bottom. This process is called: a) Decantation b) Filtration c) Sedimentation d) Evaporation

The clear liquid obtained after filtration is known as the: a) Residue b) Sediment c) Filtrate d) Supernatant

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II. Fill in the Blanks

A substance that contains two or more pure substances physically mixed in any proportion is called a _ _ _ _ _ _ _ _ _ _ _ _ _.

Components of a mixture _ _ _ _ _ _ _ _ _ _ _ _ _ their individual properties.

Mixture of oil and water is an example of a _ _ _ _ _ _ _ _ _ _ _ _ _ mixture because their components can be seen separately.

The process of pouring out a clear liquid from a vessel without disturbing the sediment is called _ _ _ _ _ _ _ _ _ _ _ _ _.

Common salt can be separated from sea water by the process of _ _ _ _ _ _ _ _ _ _ _ _ _.

The components of a compound are combined _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ and not physically mixed.

Iron filings can be separated from sand using _ _ _ _ _ _ _ _ _ _ _ _ _ separation.

A mixture with many components often requires _ _ _ _ _ _ _ _ _ _ _ _ _ than one separation method.

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III. True/False Questions

Read each statement. Write ‘True’ if the statement is correct and ‘False’ if it is incorrect.

All pure substances are elements. _ _ _ _ _ _ _ _ _ _ _ _ _

A compound has a fixed composition. _ _ _ _ _ _ _ _ _ _ _ _ _

Energy is always released during the formation of a mixture. _ _ _ _ _ _ _ _ _ _ _ _ _

Hand-picking is suitable for separating very small, similarly sized particles. _ _ _ _ _ _ _ _ _ _ _ _ _

Tea leaves are separated from tea using the sieving method. _ _ _ _ _ _ _ _ _ _ _ _ _

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IV. Explanations of Terms

Explain the following terms in one to two sentences.

Emulsion: _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 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_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ \ _ _ _ _ _ _ _ _ _ _

Answer Key for Diagram-Based Question: A visual illustrating the winnowing process, contrasting the separation of lighter husk from heavier grains via wind.

{

"image_description": "A dynamic illustration of the winnowing process. On the left, a farmer is actively pouring a mixture of wheat grains and lighter husk from a flat basket held above their head. The wind is visibly blowing from left to right. The heavier wheat grains are shown falling directly downwards in a concentrated pile on the ground below the farmer. To the right of the farmer, the lighter husk particles are depicted being carried away horizontally by the wind, forming a distinct, dispersed pile further away. The ground is a light brown, suggesting an outdoor, agricultural setting under a clear sky.",

"style": "Cartoon, educational, clear, dynamic, suitable for elementary/middle school science textbook.",

"elements_to_include": [

"Farmer figure",

"Winnowing basket",

"Stream of falling grain mixture",

"Separate pile of heavy grains directly below",

"Separate, more spread out pile of light husk carried by wind",

"Directional lines indicating wind flow",

"Clear sky and ground"

"keywords_for_ai_generator": [

"winnowing process illustration",

"farmer separating grain husk wind",

"traditional grain cleaning method",

"physical separation science",

"density separation visual",

"elementary chemistry education",

"agricultural practice diagram"

]

}

⁠

V. Short Answer Questions

Why do mixtures not have definite properties?

Name the method you would use to separate sawdust from water and explain why.

How can you obtain pure water from tap water using a separation method?

⁠

VI. Observation-Based Questions

Observe the following scenario and answer the questions.

Scenario: You have a glass containing muddy water. You leave it undisturbed for several hours.

What will you observe after several hours?

What is the name of the process that occurs when the mud settles down?

If the mud particles were very light and did not settle easily, what substance could you add to help them settle faster?

⁠

VII. Differentiating Concepts/Processes

Differentiate between homogeneous and heterogeneous mixtures with an example for each.

⁠

VIII. Long Answer

Imagine you have a mixture of sand, common salt, and iodine. Describe a step-by-step procedure to separate all three components. Explain the reason behind each step.

⁠

IX. Environmental Awareness / Everyday Use

A city is facing a shortage of clean drinking water. Explain how a new technology using graphene-based sieves might help solve this problem, based on what you’ve learned.

⁠

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