The Amazing World of Solutes, Solvents, and Solutions Class 8 Worksheet with Answers Science Chapter 9 - #NCSOLVE 📚

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Class 8 Science Chapter 9 The Amazing World of Solutes, Solvents, and Solutions Worksheet

Class 8 The Amazing World of Solutes, Solvents, and Solutions Worksheet

Worksheet On The Amazing World of Solutes, Solvents, and Solutions Class 8 – The Amazing World of Solutes, Solvents, and Solutions Worksheet Class 8

A. Objective Type Questions

Multiple Choice Questions

Question 1.
Study the following table:

S. No.	Component	Description
I	Solvent	Substance that gets dissolved
II	Solute	Substance present in a smaller quantity
III	Solution	Uniform mixture of solute and solvent

Which of the above are incorrectly matched?
(a) Only I
(b) I and II
(c) II and III
(d) I, II and III
Answer:
(a) Only I

Question 2.
Which of the following combinations best represents a solution, where the solute completely dissolves in the solvent to form a clear and uniform mixture?
(a) A mixture of oil and water that forms separate layers
(b) A mixture of sand and water where the sand settles at the bottom
(c) A suspension of chalk powder in water that appears cloudy and settles on standing
(d) A salt water mixture in which salt dissolves completely to form a clear solution
Answer:
(d) A salt water mixture in which salt dissolves completely to form a clear solution

Question 3.
What happens when we add more sugar to a saturated sugar solution?
(a) More sugar dissolves
(b) The extra sugar settles at the bottom
(c) The solution becomes unsaturated
(d) The water evaporates
Answer:
(b) The extra sugar settles at the bottom

Question 4.
Which statement is true about saturated solutions?
(a) They can dissolve more solute at the same temperature.
(b) They are always made using hot water.
(c) They contain the maximum amount of solute that can dissolve at a given temperature.
(d) They are used only in laboratories.
Answer:
(c) They contain the maximum amount of solute that can dissolve at a given temperature.

Question 5.
A solution with a small amount of solute is called
(a) concentrated
(b) dilute
(c) saturated
(d) supersaturated
Answer:
(b) dilute

Question 6.
Which factor does NOT affect the solubility of a solid in a liquid?
(a) Temperature
(b) Nature of solute and solvent
(c) Colour of the solution
(d) Stirring
Answer:
(c) Colour of the solution

Question 7.
The solubility of baking soda in water is affected by which of the following factors?
I. Colour of water
II. Type of spoon used for stirring
III. Temperature of water
IV. Shape of the container

(a) I and II are correct
(b) Only I is correct
(c) Only III is correct
(d) III and IV are correct
Answer:
(c) Only III is correct

Question 8.
In the image illustrated below, aquatic life is shown to survive well underwater.

Why is cold water able to support more aquatic life than warm water?
(a) Oxygen dissolves more in cold water than in warm water.
(b) Cold water contains more nutrients.
(c) Cold water is heavier than warm water.
(d) Cold water allows more sunlight to enter.
Answer:
(a) Oxygen dissolves more in cold water than in warm water.

Question 9.
Which substance is commonly used as a universal solvent in medicinal preparations in Ayurveda? .
(a) Alcohol
(b) Oil
(c) Vinegar
(d) Water
Answer:
(d) Water.

Question 10.
Mira observed that air contains different gases like oxygen, nitrogen and carbon dioxide.
What type of solution is air?
(a) Solid
(b) Liquid
(c) Gaseous mixture
(d) Non-uniform mixture
Answer:
(c) Gaseous mixture

Question 11.
Arjun observed that cooking oil floated on top of water when mixed. What&pe of mixture does oil and water form? –
(a) Uniform mixture
(b) Solution
(c) Gas in liquid
(d) Non-uniform mixture
Answer:
(d) Non-uniform mixture

Question 12.
Which method is most suitable for measuring the volume of an irregular solid?
(a) Using a ruler
(b) Using a spring balance
(c) Displacement method
(d) Using a thermometer
Answer:
(c) Displacement method

Question 13.
The SI unit of density is
(a) kg/m²
(b) kg/m³
(c) g/cm²
(d) m³/kg
Answer:
(b) kg/m³

Question 14.
Observe the scenery where large chunks of ice are seen floating on the surface of a lake in a cold region.

What does this natural observation indicate about ice?
(a) Ice is heavier than water.
(b) Ice is less denser than water.
(c) Ice is insoluble in water.
(d) Ice has the same density as water.
Answer:
(b) Ice is less denser than water.

Question 15.
What happens to the density of a gas when pressure is increased while keeping the temperature constant?
(a) Density increases
(b) Density remains the same
(c) Density decreases
(d) Gas turns into solid
Answer:
(a) Density increases

Assertion-Reason Questions

The questions given below consist of an Assertion and a Reason. Based on that, choose the appropriate option.
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
(c) Assertion is true, but Reason is false.
(d) Assertion is false, but Reason is true.

Question 1.
Assertion: Hot water can dissolve more sugar than cold water because higher temperature increases the energy of particles and enhances solubility.
Reason: The solubility of most solids decreases with temperature, allowing more of the substance to dissolve.
Answer:
(c) Assertion is true, but Reason is false.

Explanation:
The assertion is true because hot water dissolves more sugar than cold water. However, the reason is false as the solubility of most solids increases, not decreases, with temperature.
Hence, Assertion is true, but Reason is false.

Question 2.
Assertion: Stirring helps sugar dissolve faster in water.
Reason: Stirring increases contact between solute and solvent particles, allowing them to mix and interact more effectively.
Answer:
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Question 3.
Assertion: Cold water supports more aquatic life than warm water.
Reason: Oxygen dissolves more in warm water than in cold water.
Answer:
(c) Assertion is true, but Reason is false.

Explanation:
The assertion is true because cold water supports more aquatic life. But the reason is false because oxygen dissolves more in cold water and not in warm water. Hence, Assertion is true, but Reason is false.

Question 4.
Assertion: Solubility of carbon dioxide in soda water increases when the bottle is kept in sunlight.
Reason: Gases dissolve less in liquids at higher temperatures as heat makes gas particles escape more easily into the air.
Answer:
(d) Assertion is false, but Reason is true.

Explanation:
The assertion is false as the solubility of carbon dioxide decreases in sunlight (warm temperatures). The reason is true as gases dissolve less in liquids at higher temperatures. Hence, Assertion is false but Reason is true.

Question 5.
Assertion: Bamboo floats on water due to its ability to remain above the surface without sinking.
Reason: Bamboo has a lower density than water, which allows it to stay afloat.
Answer:
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Explanation:
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Fill in the Blanks

Question 1.
Fill in the blanks by choosing the appropriate words from the box given below:

evaporates, salt, particles, uniform, dissolves, stirred, volume, solubility

(a) When a solid like ________ is added to water and ________, it forms a clear and uniform solution.
Answer:
salt, stirred

(b) A mixture is called ________ because the tiny ________ of the solute are evenly spread throughout the solvent.
Answer:
uniform, particles

(c) The rate at which a solute ________ in a solvent increases when the mixture is heated or continuously ________.
Answer:
dissolves, stirred

(d) The amount of solute that can dissolve in a fixed ________ of solvent at a particular temperature is known as its ________.
Answer:
volume, solubility

(e) When salt water is left open, the water slowly ________ into the air, leaving the solid ________ behind.
Answer:
evaporates, salt

Question 2.
Fill in the blanks by choosing the correct word from the bracket:
(a) Sugar is the ________ (solute/solvent) in sugar water.
Answer:
solute

(b) A mixture in which the components are spread uniformly throughout is called a ________ (uniform/non-uniform) mixture.
Answer:
uniform

(c) Liquids like oil and water form a ________ (non-uniform/uniform) mixture.
Answer:
non-uniform

(d) The amount of solute dissolved in a given quantity of solution is called its ________ (concentration/volume).
Answer:
concentration

(e) When the temperature of water increases, the solubility of oxygen in it ________(increases/decreases).
Answer:
decreases

(f) The ________ (layers/particles) of the Earth’s crust are made up of different materials with different densities.
Answer:
layers

True/False

Question 1.
Choose the option which shows the correct sequence of True (T) and False (F) for the statements given below:
(a) All liquids can dissolve in water.
(b) A saturated solution can dissolve more solute at a given temperature.
(c) Sugar dissolves faster in hot water than in cold water.
(d) Density is the ratio of mass to volume, and its SI unit is kg/m3.
(e) An iron rod is denser than a wooden stick of the same size.
(1) T T T F F F
(2) F F T T T
(3) F T F T T
(4) F F T T F
Answer:
(2) F F T T T

Question 2.
Put a tick with a green sketch pen if the statement is correct about states of matter,
(a) In a solution, the solvent is always present in larger quantity than the solute.
Answer:
True

(b) As temperature increases, the particles of a substance—whether solid, liquid, or gas have gain energy and tend to move farther apart from each other.
Answer:
True

(c) All gases are highly soluble in water.
Answer:
False
Reason: Not all gases are highly soluble in water and their solubility varies from gas to gas.

(d) For gases, increasing the pressure results in a decrease in volume.
Answer:
True

(e) A bamboo raft floats on water because it is denser than water.
Answer:
False
Reason: A bamboo raft floats because it is less dense than water and not denser.

Question 3.
Check out the notice board of your school’s Science Club, where studentgjaave pinned some statements about solutes, solvents, and solutions. Mark (✓) if the statement is true and scientifically correct. Mark (✗) for false if it is a rumour or incorrect.

Match the Following

Question 1.
Match the terms given in Column I with the phrases given in Column II.

Column I (Terms)	Column II (Property)
(a) Solute	(i) Substance that dissolves other substances
(b) Solvent	(ii) Uniform mixture of two or more substances
(c) Solution	(iii) Cannot dissolve any more solute
(d) Saturated solution	(iv) Substance that gets dissolved
(e) Concentration	(v) Amount of solute in a given amount of solution

(a) ________
(b) ________
(c) ________
(d) ________
(e) ________
Answer:

Column I (Terms)	Column II (Property)
(a) Solute	(iv) Substance that gets dissolved
(b) Solvent	(i) Substance that dissolves other substances
(c) Solution	(ii) Uniform mixture of two or more substances
(d) Saturated solution	(iii) Cannot dissolve any more solute
(e) Concentration	(v) Amount of solute in a given amount of solution

Question 2.
Match the Column I with Column II.

Column I (Terms/Example)	Column II (Property)
(a) Density	(i) Acts as solvent
(b) Digital weighing balance	(ii) Mass / Volume
(c) Non- uniform mixture	(iii) Used to measure mass
(d) Measuring cylinder	(iv) Mixture with non- uniform composition
(e) Nitrogen in air	(v) Used to measure volume

(a) ________
(b) ________
(c) ________
(d) ________
(e) ________
Answer:

Column I (Terms/Example)	Column II (Property)
(a) Density	(ii) Mass / Volume
(b) Digital weighing balance	(iii) Used to measure mass
(c) Non- uniform mixture	(iv) Mixture with non- uniform composition
(d) Measuring cylinder	(v) Used to measure volume
(e) Nitrogen in air	(i) Acts as solvent

Question 3.
Match the images (i)-(vi) with the correct labels given below. Each label represents a concept or example from the chapter.

A. Lighter than water
B. Non- Uniform mixture
C. Soluble substance
D. Uniform mixture
E. Heavier than water
(i) ________
(ii) ________
(iii) ________
(iv) ________
(v) ________
Answer:
(i) (C), (ii) (A), (iii) (B), (iv) (D),(v) (E)

One Word Type Questions

(a) A mixture that does not have the same composition throughout. ________
Answer:
Non-uniform

(b) The process of reducing the concentration of a solution by adding more solvent. ________
Answer:
Dilution

(c) The term used to describe the amount of solute dissolved in a given quantity of solution. ________
Answer:
Concentration

(d) Gas that is present in air the most and acts as the solvent. ________
Answer:
Nitrogen

(e) The common apparatus used to measure the volume of liquids in a laboratory. ________
Answer:
Measuring cylinder

B. Subjective Type Questions

Define the Following Terms

1. Solution
_____________________________

2. Uniform Mixture
_____________________________

3. Diluted Solution
_____________________________

4. Solubility
_____________________________

5. Density
_____________________________

Give Reasons for the Following

1. Sugar dissolves faster in hot water than in cold water.
_____________________________

2. A measuring cylinder is used to measure the volume of a liquid.
_____________________________

3. A wooden log floats on water while an iron nail sinks.
_____________________________

Very Short Answer Type Questions

Question 1.
Give one example each of
(i) uniform mixture ________
(ii) non-uniform mixture ________

Question 2.
What is meant by solute and solvent?
_____________________________

Question 3.
Identify the solute and the solvent in soda water.
_____________________________

Question 4.
Which gas is most abundant in air and acts as a solvent?
_____________________________

Question 5.
Does temperature affect the solubility of substances?
_____________________________

Question 6.
What happens to the solubility of a gas in water when the temperature increases?
_____________________________

Question 7.
Which part of rice floats on water while washing?
_____________________________

Question 8.
Objects with lower density than water float on its surface. Is the statement true?
_____________________________

Question 9.
Observe the apparatus given below. The following device/apparatus loused to measure .

_____________________________

Question 10.
Which layer of the Earth has the lowest density?
_____________________________

Short Answer Type Questions

Question 1.
Raman was preparing a salt solution by dissolving salt completely in a glass of water. Meanwhile, his sister was playing with a bowl containing a mixture of pebbles and sand.
(a) Identify the type of mixture prepared by Raman and his sister. (Uniform or Non-uniform)
_____________________________

(b) Mention one difference between these two mixtures.
_____________________________

Question 2.
Differentiate between a uniform and a non-uniform mixture.
_____________________________

Question 3.
Meera dissolved salt in water and found that it disappeared completely. How does this observation support the particulate nature of matter?
_____________________________

Question 4.
Air is a gaseous solution. Justify your answer.
_____________________________

Question 5.
Rajesh prepared two solutions: one with a small amount of salt in water another with a large amount of salt in water. What is the difference between these solutions?
_____________________________

Question 6.
Read the following statements carefully and arrange them in sequence to show how sugar dissolves in hot water more easily than in cold water.
(a) Sugar is added to hot water.
_____________________________

(b) The sugar particles spread out and mix with water molecules.
_____________________________

(c) The increased temperature gives energy to the particles to move faster.
_____________________________

(d) The sugar dissolves completely in the hot water.
_____________________________

Question 7.
Rearrange the words to form meaningful scientific sentences:
(a) solution / uniform / a /mixture / is / of / substances / two / or / more
_____________________________

(b) solubility / temperature / increases / most / with / of /solids
_____________________________

Question 8.
What observation can you draw from the given figure?

_____________________________
_____________________________
_____________________________

Question 9.
Describe an activity to measure the volume of an irregular solid.
_____________________________
_____________________________
_____________________________

Long Answer Type Questions

Question 1.
Classify the following mixtures as uniform or non-uniform (heterogeneous)..
(a) Salt dissolved in water _____________________________
(b) Sugar mixed completely in tea_____________________________
(c) Sawdust added to water _____________________________
(d) Chalk powder stirred in water _____________________________
(e) Air (a mixture of gases) _____________________________

Question 2.
Distinguish between the following pairs:
(a) Saturated and Unsaturated solution
_____________________________

(b) Dilute and Concentrated solution
_____________________________

Question 3.
Describe an activity to show that a solvent can dissolve only a limited amount of solute and beyond which the solution becomes saturated.
_____________________________
_____________________________
_____________________________

Question 4.
Give reasons for the following and justify the following statements:
(a) Adding more solvent can turn a concentrated solution into a dilute one.
_____________________________
_____________________________
_____________________________

(b) Cold water supports more aquatic life than warm water
_____________________________
_____________________________
_____________________________

(c) Oil floats on the surface of water.
_____________________________
_____________________________
_____________________________

Question 5.
A metal block has a mass of 1.17 kg and displaces 0.0015 m³ of water when fully submerged.
(a) Calculate the density of the metal block in kg/m³.
_____________________________
_____________________________
_____________________________

(b) The density of water is 1000 kg/m³. Will the metal block float or sink in water? Justify your answer.
_____________________________
_____________________________
_____________________________

Case Based Questions

Question 1.
Read the paragraph and answer the following questions :
Priya was helping her mother in the kitchen. She observed that when her mother added sugar to hot tea, it dissolved quickly and completely. However, when she added sugar to cold water, it took much longer to dissolve. She also noticed that after adding several spoons of sugar to the tea, no more sugar would dissolve even with stirring.
I. Why did sugar dissolve faster in hot tea than in cold water?
(a) Hot tea has more colour
(b) High temperature increases solubility and particle movement
(c) Cold water contains less sugar
(d) Cold water is heavier than hot tea
Answer:
(b) High temperature increases solubility and particle movement

II. What type of solution was formed when no more sugar could dissolve in the tea?
(a) Saturated solution
(b) Dilute solution
(c) Concentrated solution
(d) Supersaturated solution
Answer:
(a) Saturated solution

Question 2.
Ritu observed that a wooden log floated on water, while a metal key of the same size sank quickly. Her teacher explained that this difference in behaviour was due to a property that depends on how much mass is packed into a given volume. To find this property X, we need to measure both the mass and the volume of an object. The SI unit of X is ‘Y’.
I. What is ‘X’?
(a) Volume
(b) Temperature
(c) Density
(d) Weight
Answer:
(c) Density

II. What is ‘Y’?
(a) kg/m³
(b) g/cm³
(c) m/s²
(d) kg
Answer:
(a) kg/m³

Question 3.
Observe the image given below showing measuring cylinders of different sizes used in a laboratory to measure the volume of liquids.

A student is provided with three unknown liquids—A, B, and C. She pours 50 mL of each liquid into a measuring cylinder of suitable size. She records their mass using a digital weighing balance and calculates their densities using the formula:
Density = Mass / Volume

The observations are as follows:

Liquid	Mass (g)	Volume (mL)
A	100	50
B	65	50
C	40	50

I. Which liquid is the most dense?
(a) A
(b) B
(c) C
(d) All have the same density
Answer:
(a) A

Density of A = 100/50 = 2.0 g/mL
Density of B = 65/50 = = 1.3 g/mL
Density of C = 40 / 50 = = 0.8 g/mL
Hence, Liquid A has the highest density.

II. If the student wants to measure exactly 50 mL of liquid with the least error, which cylinder should she choose?
(a) The largest cylinder available in the lab
(b) The smallest cylinder that can hold just above 50 mL
(c) Any random cylinder as the capacity doesn’t affect accuracy
(d) The one with the widest base and regardless of graduations
Answer:
(b) The smallest cylinder that can hold just above 50 mL

Smaller cylinders with finer graduations allow more precise readings and minimise error during volume measurements.

Question 4.
Read the passage given below and answer the questions that follow.
In ancient times, before large ships were invented, people used bamboo and wooden logs to make rafts and boats for travelling across rivers and seas. These boats helped in fishing, trading and moving from one place to another.
How does the structure of bamboo help it in floating on water? Why do you think people preferred using bamboo and wood for boats instead of metal?

_____________________________
_____________________________
_____________________________

Question 5.
Read the passage given below and answer the questions that follow:
Riya saw a hot air balloon rising and asked her teacher the reason behind it. The teacher explained that warm air is lighter than cool air because its density becomes lower when heated. Why does the density of air decrease when heated, and how does this help the hot air balloon rise in the air?

_____________________________
_____________________________
_____________________________

Skill Based Activities

Question 1.
Find out the words from the puzzle with the help of the clues given below:
A. The liquid in which a solute dissolves to form a solution.
B. The property of matter defined as mass per unit volume.
C. A solution that contains the maximum amount of solute that can dissolve.
D. The substance that dissolves in a solvent.
E. A solution that contains a small amount of solute.

Answer:
A. SOLVENT
B. DENSITY
C.SATURATED
D. SOLUTE
E. DILUTE

Question 2.
Find the odd one out and justify your answer,
(a) Solvent, Solute, Solution, Stone
_____________________________
_____________________________
Answer:
Stone is not a part of a solution. Solvent, solute, and solution are directly involved in solution formation, while stone is not a dissolvable substance in the context of this chapter.

(b) Saturated, Unsaturated, Dilute, Solid
_____________________________
_____________________________
Answer:
Solid is a state of matter, while saturated, unsaturated, and dilute refer to types of solutions based on how much solute is dissolved in the solvent.

(c) Salt, Sugar, Water, Sand
_____________________________
_____________________________
Answer:
Sand does not dissolve in water and forms a suspension or settles down, while salt, sugar, and water are components that form a solution where the solute dissolves completely in the solvent.

Question 3.
Underlined words in the following sentences are jumbled up. Write them in their correct form to give meaning to the sentence.
(a) A UTLSEO is the substance that gets dissolved in a solution. ________
(b) UNIFOMR mixtures have the same composition throughout. ________
(c) Gases are more OSULBEL in cold water than in hot water. ________
(d) When heated, a substance expands and its DENTIYS decreases. ________
(e) The Earth’s outermost layer is called the SRCUT. ________.
Answer:
(a) SOLUTE
(b) UNIFORM
(c) SOLUBLE
(d) DENSITY
(e) CRUST

Question 4.
Complete the Paragraph.
Whether an object floats or sinks in water depends on its (i) ________, which is the mass per unit volume. A lighter object like a (ii) ________ floats easily and was used to travel across rivers, while a dense object like (iii) ________ sinks quickly. Interestingly, ice floats on water because its density is (iv) ________ than that of water. When the (v) ________ of a substance increases, its particles move apart, usually lowering the density. This principle helps a (vi) ________ rise, as the air inside becomes lighter than the surrounding air.
Answer:
(i) density
(ii) bamboo raft
(iii) iron
(iv) less
(v) temperature
(vi) hot air balloon

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