Beaker 1 contains a true solution, beaker 2 contains a colloid and Beaker 3 contains a suspension. Tabulate the characteristics of each mixture in the following table. Activity Solution Colloid Suspension Filtering using a filter paper Particles can not be separated by filtration _____ _____ Passing an intense beam of light The path of the light beam is not visible The path of the light beam is visible _____ Keep it undisturbed _____ _____ Particles settle down

Activity Solution Colloid Suspension Filtering using a filter paper Particles can not be separated by filtration Particles can not be separated by filtration Particles can be separated by filtration Passing an intense beam of light The path of the light beam is not visible The path of the light beam is visible The path of the light beam is visible Keep it undisturbed Particles do not settle down Particles do not settle down Particles settle down The particles of true solution cannot be filtered through a filter paper because they are too small and are not visible to the naked eyes. The colloidal substances having very small constituents as compared to the pores of the filter paper. Hence, the constituent substances of colloid cannot be separated by ordinary filtration. The particles of a suspension do not pass through a filter paper. So a suspension can be separated by filtration. In the case of colloids, the solute (colloidal) particle size is comparatively bigger. Hence, they scatter a beam of light, thus making the path of the beam visible.The particles of suspensions are big enough to be seen with the naked eye. The light falling on them is reflected almost completely. When light is passed through a true solution, the dissolved particles are too small to deflect the light. The true solution is a homogeneous mixture, the particles are evenly distributed in the solution and do not get settled at the bottom of the container. The colloidal particles are smaller and not heavy. They always remain in a state of zig-zag motion hence do not settle down. The particles in a suspension are far larger than those of a solution, so gravity is able to pull them down and hence particles settle down.

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8th Kerala Board

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All solutions are mixtures. Still, do all mixtures exhibit the same nature?

Important Questions on Solutions

MEDIUM

8th Kerala Board

IMPORTANT

Science for Class 8 - Part 2>Chapter 4 - Solutions>Exercise 7>Q 1

Let's do an experiment. Take equal amounts of water in three separate beakers. Add copper sulphate crystals in the first, milk in the second and chalk powder in the third beaker. Stir them well. Keep the beakers undisturbed for some time.

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In which of these beakers did the substance settle down?

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8th Kerala Board

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Science for Class 8 - Part 2>Chapter 4 - Solutions>Exercise 7>Q 2

Let's do an experiment. Take equal amounts of water in three separate beakers. Add copper sulphate crystals in the first, milk in the second and chalk powder in the third beaker.

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What will you observe if an intense beam of light is passed through the sides of the three beakers? Write your answers in Yes/No in the following table.

Observation	Beaker- $1$	Beaker- $2$	Beaker- $3$
The path of the beam can be observed
Particles can be observed

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8th Kerala Board

IMPORTANT

Science for Class 8 - Part 2>Chapter 4 - Solutions>Exercise 7>Q 3

Beaker $1$ contains a true solution, beaker $2$ contains a colloid and Beaker $3$ contains a suspension. Tabulate the characteristics of each mixture in the following table.

Activity	Solution	Colloid	Suspension
Filtering using a filter paper	Particles can not be separated by filtration	_____	_____
Passing an intense beam of light	The path of the light beam is not visible	The path of the light beam is visible	_____
Keep it undisturbed	_____	_____	Particles settle down

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8th Kerala Board

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Science for Class 8 - Part 2>Chapter 4 - Solutions>Exercise 7>Q 4

Beaker - $1$ contains a true solution. Beaker- $2$ contains a colloid and Beaker - $3$ contains a suspension. Which mixture in these beakers has the smallest particle size? How was this identified?

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8th Kerala Board

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Science for Class 8 - Part 2>Chapter 4 - Solutions>Exercise 7>Q 5

Beaker -

1

contains a true solution. Beaker -

2

contains a colloid and Beaker -

3

contains a suspension. Which mixture in these beakers has the biggest particle size?

MEDIUM

8th Kerala Board

IMPORTANT

Science for Class 8 - Part 2>Chapter 4 - Solutions>Exercise 7>Q 6

Evaluate the following mixtures: Ink, muddy water, fog, atmospheric air, milk, sugar solution, dilute rice water. Classify them into true solution, colloid and suspension.

MEDIUM

8th Kerala Board

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Science for Class 8 - Part 2>Chapter 4 - Solutions>Exercise 7>Q 7

Have you noticed that the path of the light beam can be clearly seen due to the dust particles in a cinema theatre and in smart classrooms where visuals are shown using a projector? What is the reason behind this?

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8th Kerala Board

IMPORTANT

Science for Class 8 - Part 2>Chapter 4 - Solutions>Exercise 7>Q 8

Tabulate the mixtures that we use in our daily life into solutions, colloids and suspensions. Are colloids and suspensions homogeneous mixtures?

All solutions are mixtures. Still, do all mixtures exhibit the same nature?

Important Questions on Solutions

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