Nature of Matter: Elements, Compounds, and Mixtures Class 8 Worksheet with Answers Science Chapter 8 - #NCSOLVE 📚

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Class 8 Science Chapter 8 Nature of Matter: Elements, Compounds, and Mixtures Worksheet

Class 8 Nature of Matter: Elements, Compounds, and Mixtures Worksheet

Worksheet On Nature of Matter: Elements, Compounds, and Mixtures Class 8 – Nature of Matter: Elements, Compounds, and Mixtures Worksheet Class 8

A. Objective Type Questions

Multiple Choice Questions

Question 1.
Ritu adds salt to water and stirs it well. The salt disappears and she cannot see it anymore. What kind of mixture is this?
(a) Non-uniform mixture
(b) Colloidal mixture
(c) Uniform mixture
(d) Suspended mixture
Answer:
(c) Uniform mixture

Question 2.
Rehan was helping his mother in the kitchen. He noticed that when she prepared lemonade, the sugar completely dissolved in the water. He asked whether the sugar could be separated from it again. What is the correct explanation?
(a) It is a compound, so sugar cannot be separated.
(b) It is a mixture, and sugar can be separated by chemical methods.
(c) It is a uniform mixture and sugar can be separated by physical method like evaporation.
(d) It is a non-uniform mixture where sugar settles at the bottom.
Answer:
(c) It is a uniform mixture and sugar can be separated by physical method like evaporation.

Question 3.
Which of the following is a non-uniform mixture?
(a) Salt solution
(b) Brass
(c) Air
(d) Mixture of sand and iron filings
Answer:
(d) Mixture of sand and iron filings

Question 4.
Brass is a mixture of
(a) copper and tin
(b) copper and zinc
(c) iron and chromium
(d) aluminium and zinc
Answer:
(b) copper and zinc

Question 5.
Priya was making a science project using copper and zinc. Her teacher suggested using brass instead. Why is brass a better choice?
(a) It is lighter than copper and zinc.
(b) It is a pure substance and has better properties.
(c) It is an alloy, a uniform mixture with improved strength and durability.
(d) It reacts easily with air and gives a shine.
Answer:
(c) It is an alloy, a uniform mixture with improved strength and durability.

Question 6.
Choose a gas which is found the most in air?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Argon
Answer:
(c) Nitrogen

Question 7.
Why does lime water turn milky when exposed to air?
(a) Due to dust
(b) Due to nitrogen
(c) Due to carbon dioxide
(d) Due to oxygen
Answer:
(c) Due to carbon dioxide

Question 8.
AQI stands for
(a) Air Quality Index
(b) Atmospheric Quantity Indicator
(c) Air Quality Information
(d) Air Quantity Isotope
Answer:
(a) Air Quality Index

Question 9.
Which of the following is a pure substance?
(a) Milk
(b) Soil
(c) Iron
(d) Fruit juice
Answer:
(c) Iron

Question 10.
Read the statements given below about the elements.
(i) Made of one kind of atom.
(ii) Can be broken down into simpler substances.
(iii) Classified as metals, non-metals and metalloids.
(iv) Found in both free and combined forms.
Choose the correct set of true statements:
(a) (i), (iii), and (iv)
(b) (ii), (iii), and (iv)
(c) (i), (ii), and (iii)
(d) (i), (ii), and (iv)
Answer:
(a) (i), (iii), and (iv)

Question 11.
Which element exists as a liquid at room temperature?
(a) Gallium
(b) Bromine
(c) Iron
(d) Nitrogen
Answer:
(b) Bromine

Question 12.
Study the given table:

Sample	Fixed Composition?	Physically Separable?	Example of Type
(i) Sugar
(ii) Brass
(iii) Glucose

Which of the above combinations are incorrectly described?
(a) (i) and (ii) only
(b) (ii) and (iii) only
(c) (i) and (iii) only
(d) (i), (ii) and (iii)
Answer:
(c) (i) and (iii) only

Question 13.
Aadi was learning about mixtures in school. He mixed iron filings with sulphur powder and noticed that they could still be separated using a magnet. However, after heating the mixture, he saw that the resulting substance did not respond to a magnet anymore. What conclusion can be drawn from this?
(a) The mixture has become non-uniform
(b) A new compound has formed with properties different from the original elements
(c) Sulphur lost its magnetic property
(d) Iron evaporated during the reaction
Answer:
(b) A new compound has formed with properties different from the original elements

Question 14.
Aarav’s science teacher gave him a task: classify the following – iron, air, iron oxide. What is the correct classification?
(a) Iron – compound, Air – mixture, Iron oxide – element
(b) Iron – element. Air – mixture, Iron oxide – compound
(c) Iron – mixture, Air – compound. Iron oxide – element
(d) Iron – element, Air – compound, Iron oxide – mixture
Answer:
(b) Iron – element. Air – mixture, Iron oxide – compound

Question 15.
Given below is an image of a physical mixture. Choose the correct observation:

Iron and sulphur fillings mixture

(a) New substance is formed on mixing
(b) Components lose their properties
(c) Can be separated using a magnet
(d) Cannot be separated by physical method
Answer:
(c) Can be separated using a magnet

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: Mixtures always have a fixed composition.
Reason: Mixtures are formed by physical combination of two or more substances.
Answer:
(d) Assertion is false, but Reason is true.

Question 2.
Assertion: Alloys are considered mixtures.
Reason: Alloys consist of elements that are chemically bonded together.
Answer:
(c) Assertion is true, but Reason is false.

Question 3.
Assertion: Elements cannot be separated into simpler substances by any method.
Reason: Elements are made up of only one kind of atom.
Answer:
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

Question 4.
Assertion: Water is a compound made of elements, hydrogen and oxygen.
Reason: Water can be broken down into hydrogen and oxygen by passing electricity.
Answer:
(b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

Question 5.
Assertion: Air is a compound which is formed when different elements combine in fixed ratio.
Reason: It contains oxygen and nitrogen in fixed ratio.
Answer:
(d) Assertion is false, but Reason is true.

Explanation:
Assertion is false, but Reason is true. Air is a mixture, not a compound. The gases in air are not chemically combined nor present in a fixed ratio.

Fill in the Blanks

Question 1.
Fill in the blanks by choosing the appropriate word from the box given below:
element, mixture, water, compound, air, uniform, non-uniform, sulphur, alloys, electrolysis, pure
(a) A ________ contains two or more substances mixed physically without any chemical change.
Answer:
mixture

(b) Stainless steel and brass are examples of ________, made for better strength or properties.
Answer:
alloys

(c) ________ is a uniform mixture of several gases like oxygen and nitrogen.
Answer:
air

(d) Mixtures like soil and sprout salad are ________ because components are easily visible.
Answer:
non-uniform

(e) A ________ has elements combined chemically in a fixed ratio.
Answer:
compound

Question 2.
Fill in the blanks by unjumbling the words given in the brackets:
(a) A mixture in which the components are evenly distributed is called ________. (frmouin)
Answer:
uniform

(b) A solid, uniform mixture of two or more metals is called an ________. (loyla)
Answer:
alloy

(c) A mixture of copper and zinc used in musical instruments is called ________. (ssbar)
Answer:
brass

(d) The gas that supports burning and is part of air is ________. (xeygno)
Answer:
oxygen

(e) The lightest material used in oil spill clean-up is ________. (napehger gelaroe)
Answer:
graphene aerogel

True/False

Question 1.
Put a tick (✓) against the correct statements and cross (✗) against the incorrect statements about the properties or features of mixtures.
(a) The components of a mixture can be separated by physical methods.
Answer:
✓

(b) Mixtures are always formed by a fixed ratio of elements.
Answer:
✗

Reason: Mixture is formed when two or more substances are mixed where each substance retains its properties.

(c) The components of a mixture retain their original properties.
Answer:
✓

(d) Air is a uniform mixture of gases like nitrogen and oxygen.
Answer:
✓

(e) Soil is a non-uniform mixture.
Answer:
✓

Question 2.
Choose the option which shows the correct sequence True (T) and False (F) for the statements given below :
(a) Water is a mixture of hydrogen and oxygen.
(b) Alloys like brass are uniform mixtures.
(c) Mixtures show properties of their components.
(d) Metals are generally poor conductors of heat and electricity.
(e) Heating iron and sulphur together forms a compound.
(f) Elements can be broken down further by physical means.
(1) F T T F T F
(2) T F T F T T
(3) F T T F T F
(4) T T T F T F
Answer:
(2) T F T F T T

Match the Following

Question 1.
Match the explanation in Column I with their suitable scientific terms in Column II.

Column I (Explanations)	Column II (Terms)
(a) A uniform mixture of gases like nitrogen and oxygen	(i) Compound
(b) A pure substance made of chemically combined elements	(ii) Air
(c) A substance made of only one kind of atom	(iii) Element
(d) A solid solution of two metals (e.g., copper + zinc)	(iv) Alloy
(e) A mixture where different components are visible	(v) Non-uniform mixture

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

Column I (Explanations)	Column II (Terms)
(a) A uniform mixture of gases like nitrogen and oxygen	(ii) Air
(b) A pure substance made of chemically combined elements	(i) Compound
(c) A substance made of only one kind of atom	(iii) Element
(d) A solid solution of two metals (e.g., copper + zinc)	(iv) Alloy
(e) A mixture where different components are visible	(v) Non-uniform mixture

Question 2.
Match the terms given in Column I with the phrases given in Column II.

Column I	Column II
(a) Air	(i) Compound
(b) Water	(ii) Mixture
(c) Iron	(iii) Metal element
(d) Brass	(iv) Alloy (mixture of metals)
(e) Quartz	(v) Mineral compound

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

Column I	Column II
(a) Air	(ii) Mixture
(b) Water	(i) Compound
(c) Iron	(iii) Metal element
(d) Brass	(iv) Alloy (mixture of metals)
(e) Quartz	(v) Mineral compound

B. Subjective Type Questions

Define the Following Terms

1. Mixture
____________________________________

2. Uniform mixture
____________________________________

3. Non-uniform mixture
____________________________________

4. Alloy
____________________________________

5. Element
____________________________________

6. Metalloid
____________________________________

7. Compound
____________________________________

8. Minerals
____________________________________

Give Reasons for the Following

1. Air is considered a mixture.
____________________________________

2. Water is a compound and not a mixture.
____________________________________

3. Salt solution is considered a mixture.
____________________________________

Very Short Answer Type Questions

Question 1.
Which type of mixture is air?
____________________________________

Question 2.
Name one alloy and also its components.
____________________________________

Question 3.
Which gas turns lime water milky?
____________________________________

Question 4.
Name a non-uniform mixture you see in daily life.
____________________________________

Question 5.
How many types of particles make up a pure substance?
____________________________________

Question 6.
Name one element and one compound.
____________________________________

Question 7.
What kind of element is germanium?
____________________________________

Question 8.
How many elements are liquid at room temperature? Name them.
____________________________________

Question 9.
What is formed when iron and sulphur are heated together?
____________________________________

Question 10.
What is graphene aerogel used for?
____________________________________

Short Answer Type Questions

Question 1.
Observe the given example and answer: Rahul added salt to water and stirred. The salt disappeared.
(a) What type of mixture is formed?
____________________________________

(b) Write any two properties of such mixtures.
____________________________________

Question 2.
Reena mixes sand with iron filings,
(a) What type of mixture is it?
____________________________________

(b) How can the components be separated?
____________________________________

Question 3.
Why can salt be recovered from a salt solution by evaporation and not by filtration?
____________________________________
____________________________________
____________________________________

Question 4.
What is an alloy? Give two examples.
____________________________________
____________________________________
____________________________________

Question 5.
Name the gas that turns lime water milky. Why does this happen? Give the word equation for the reaction.
____________________________________
____________________________________
____________________________________

Question 6.
During an activity, students place a black sheet of paper undisturbed near an open window or outdoors for several hours. They observe particles suspended in a sunbeam. What does this prove about air?
____________________________________
____________________________________
____________________________________

Question 7.
Identify whether these are pure substances or mixtures.

Substance	Type
Air
Water
Iron

Question 8.
What is the main difference between a mixture and a compound?
____________________________________

Question 9.
State two characteristics of pure substances.
____________________________________

Question 10.
What are elements? Give one metallic and one non-metallic examgle
____________________________________

Question 11.
Vikram observes his teacher heating sugar in a test tube. After some time, black residue forms. What is the black substance?

____________________________________

Question 12.
Look at the table and answer the questions:

Mineral	Use
Silver	Jewellery, electronics
Calcite	Cement production
Talc	Cosmetic products (talcum)
Copper	Electrical wires

(a) Which two are native minerals?
____________________________________

(b) Which one is used in construction?
____________________________________

(c) Which mineral is used in personal care products?
____________________________________

Long Answer Type Questions

Question 1.
Complete and analyse the following:

Type of Matter	Description	Example
(i) Element	Only one kind of atom	Gold
(ii) Compound	Chemically combined elements	Iron and sand
(iii) Mixture	Physically combined substances	Salt solution

Question 2.
Differentiate between Elements, Compounds, and Mixtures in a table with examples.

Property	Elements	Compounds	Mixtures

Question 3.
Observe the diagram below of passing electricity through water and answer the following questions:

(i) Name the gases collected in both test tubes.
____________________________________

(ii) Which gas supports combustion and which gas is flammable?
____________________________________

(iii) Why is the volume of hydrogen collected more than oxygen?
____________________________________

Question 4.
Explain the importance of mixtures and compounds in daily life with examples.
____________________________________
____________________________________
____________________________________

Question 5.
The following diagram shows a student mixing (Sample A) and heating (Sample B) iron and sulphur. Observe and answer the following questions :

(i) What is the difference between Sample A and Sample B?
____________________________________

(ii) What type of change occurs in Sample B – physical or chemical?
____________________________________

(iii) What is the name of the new substance formed?
____________________________________

Case Based Questions

Question 1.
Read the paragraph and answer the following questions.
Riya took three beakers with equal amounts of water. She added salt to the first, sand to the second, and sugar to the third. She stirred all of them for 2 minutes and left them undisturbed.

I. Which substances will completely dissolve in water?
(a) Salt and sugar
(b) Sand and sugar
(c) Only sugar
(d) Only sand
Answer:
(a) Salt and sugar

II. Which beaker shows a mixture that is not uniform throughout?
(a) Beaker with salt
(b) Beaker with sand
(c) Beaker with sugar
(d) All three ?
Answer:
(b) Beaker with sand

III. What kind of substance is sugar?
(a) Mixture
(b) Element
(c) Compound
(d) None of these
Answer:
(c) Compound

Question 2.
In a lab activity, students passed electric current through water and collected two gases. They noticed that the properties of these gases were very different from water.
I. What kind of change is electrolysis of water?
(a) Physical change
(b) Reversible change
(c) No change
(d) Chemical change
Answer:
(d) Chemical change

II. What are the products of this reaction?
(a) Hydrogen and carbon
(b) Hydrogen and oxygen
(c) Oxygen and nitrogen
(d) Hydrogen and water vapour
Answer:
(b) Hydrogen and oxygen

III. Which of the following is true about the reaction?
(a) Water remains unchanged
(b) New substances are formed
(c) Water is a mixture
(d) Hydrogen and oxygen combine to form elements
Answer:
(b) New substances are formed

Question 3.
Arjun mixed iron filings and sulphur powder and heated the mixture-Mfter the reaction, he noticed the new substance did not show properties of iron Or sulphur.
I. What kind of change took place during heating the mixture?
(a) Physical
(b) No change
(c) Chemical
(d) Reversible
Answer:
(c) Chemical

II. The substance formed is a:
(a) Mixture
(b) Element
(c) Compound
(d) Alloy
Answer:
(c) Compound

III. Can the new substance be separated by a magnet?
(a) Yes
(b) No
Answer:
(b) No

Question 4.
Seema was given a mixture of iron filings and sulphur powder in the science lab. She was told to perform two activities:
(A) In Activity 1, she carefully observed and separated the iron from sulphur using a magnet.
____________________________________
____________________________________

(B) In Activity 2, she took a fresh mixture of iron and sulphur, placed it in a test tube, and heated it until a black solid formed. She noticed that this black substance did not respond to a magnet and looked completely different from the original materials.
(i) Why was Seema able to separate the iron from sulphur using a magnet in Activity 1, but not in Activity 2?
____________________________________
____________________________________

(ii) What difference did Seema observe after adding dilute HCl1 to Activity l’s mixture and Activity 2’s product?
____________________________________
____________________________________

(iii) What does the difference in HCl reaction prove about the substances in Activity 1 and Activity 2?
____________________________________
____________________________________

Skill Based Activities

Question 1.
Unscramble the words related to matter given below:
(i) N I A M L R E → ________
(ii) M P C U D O N O → ________
(iii) Y A O L L → ________
(iv) RI X T U E M → ________
Answer:
(i) MINERAL
(ii) COMPOUND
(iii) ALLOY
(iv) MIXTURE

Question 2.
Choose the odd one out and justify the correct choice :
(i) Air, Brass, Water, Salt solution, Steel
(ii) Oxygen, Hydrogen, Iron, Carbon dioxide
(iii) Soil, Salad, Sand and water, Sugar solution
(iv) Silicon, Iron, Sulphur, Water
Answer:
(i) Water is a compound; while all others are mixtures.
(ii) Carbon dioxide is a compound, while the rest are elements.
(iii) Sugar solution is a uniform mixture, while others are non-uniform mixtures.
(iv) Water is a compound, while all the rest are elements.

Question 3.
Complete the Paragraph.
A (i) ________ is a combination of two or more substances that are not chemically combined. Mixtures can be (ii) ________ like air or (iii) ________ like sand and iron filings. A mixture can be separated using (iv) ________ methods. For example, salt and water can be separated by (v) ________, and iron can be separated using a (vi) ________.
Answer:
(i) mixture
(ii) uniform
(iii) non-uniform
(iv) physical methods
(v) evaporation
(vi) magnet.

Question 4.
Complete the crossword puzzle with the help of the clues given below:

Across	Down
3. A mixture of two or more metals.	1. This gas makes lime water turn milky.
5. A pure substance made of only one type of particle.	2. Formed when two or more elements join chemically.
6. A type of mixture where you cannot see the different parts.	4. Naturally occurring substances in rocks and soil.

Answer:
1. Carbon dioxide
2. Compound
3. Alloy
4. Minerals
5. Element
6. Uniform

The post Nature of Matter: Elements, Compounds, and Mixtures Class 8 Worksheet with Answers Science Chapter 8 appeared first on Learn CBSE.

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