The World of Metals and Non-metals is a chapter in the CBSE Class 7 Science syllabus from Curiosity. This chapter hub brings together revision notes, practice questions, worksheets, flashcards to help students learn, practice, and revise The World of Metals and Non-metals effectively.
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NCERT Class 7 Science Chapter 4: The World of Metals and Non-metals (Pages 41–51)
CBSE
Class 7
Science
Curiosity
4
41–51
6 study resources
Download the The World of Metals and Non-metals revision guide with key points, summaries, and quick revision notes for CBSE Class 7 Science.
Key Points
Define metals and provide examples.
Metals are lustrous, malleable, ductile, and good conductors. Examples include iron, copper, and gold.
Define non-metals and provide examples.
Non-metals are dull, brittle, and poor conductors. Examples include sulfur, carbon, and oxygen.
Explain malleability with examples.
Malleability is the ability to be shaped. Metals like gold and silver can be made into thin sheets.
Explain ductility with examples.
Ductility is the ability to be drawn into wires. Gold can be stretched into a wire up to 2 km long.
What is sonority?
Sonority is the ringing quality of sound. Metals like coins and bells exhibit this property.
State the conduction of heat in metals.
Metals conduct heat efficiently, making them ideal for cooking vessels. Wood does not conduct heat well.
State the conduction of electricity in metals.
Metals are good electrical conductors, allowing current to flow. Non-metals like sulfur do not conduct electricity.
What is rusting?
Rusting is the corrosion of iron due to moisture and air, leading to brown deposits. It can be prevented by painting.
Explain the significance of the Iron Pillar of Delhi.
The Iron Pillar shows advanced metallurgy. It's over 1600 years old with minimal rust, indicating expert skills.
What are metal oxides?
Metal oxides are generally basic and formed when metals react with oxygen. Example: Fe₂O₃.
What are non-metal oxides?
Non-metal oxides are usually acidic. For instance, SO₂ forms sulfurous acid in water.
State the effect of air on metals.
Metals can corrode when exposed to air, especially when combined with water. Example: rusting of iron.
Contrast metal and non-metal properties.
Metals are usually shiny and hard; non-metals are dull and brittle. This affects their applications.
Discuss the importance of metals in society.
Metals are essential in tools, construction, and technology. Their properties make them irreplaceable.
Explain the role of non-metals in life.
Non-metals like oxygen and nitrogen are vital for life and agriculture, supporting the ecosystem.
Define corrosion.
Corrosion is the gradual destruction of metals due to chemical reactions with environment, like rusting.
What is galvanization?
Galvanization involves coating iron with zinc to prevent rusting, an important protective measure.
List common uses of metals.
Common uses include construction materials, cookware, electronic devices, and vehicle parts.
Explain why sodium is stored in kerosene.
Sodium reacts violently with air and water, so it’s stored in kerosene to prevent such reactions.
How do non-metals differ in chemical reactions?
Non-metals typically form acids with oxygen and do not react with water like metals do, showing distinct chemistry.
Practice important questions and exam-style problems from The World of Metals and Non-metals. These questions cover key topics from the CBSE Class 7 Science syllabus.
How to practice: Start with the questions below to test your understanding of The World of Metals and Non-metals. Use the revision guide to review concepts you find difficult, then come back and retry the questions for better retention.
What is the property of a material that allows it to be beaten into thin sheets?
Which of the following metals is known for its high malleability?
Why is aluminium used for making foil?
Which of the following materials is not malleable?
When a metal is malleable, what does it indicate about its atomic structure?
What happens to a brittle material when it is hammered?
The property of metals that allows them to be drawn into wires is known as?
Which of the following metals would you expect to be less malleable?
If you want to create a thin sheet from a block of metal, which property is most important?
What defines a material as not malleable?
Which common household item demonstrates malleability?
Why can't non-metals like sulfur be shaped into sheets?
Which of the following best describes the relationship between malleability and ductility?
If a material can be hammered into a flat shape and retains that shape, it is considered to be?
Among the following, which metal is liquid at room temperature and cannot be considered malleable?
What does malleability refer to in materials?
Which of the following materials is known for its high malleability?
Which of the following can be formed into thin sheets due to malleability?
Why are metals usually more malleable than non-metals?
Which process is typically used to test the malleability of metals?
If a material breaks easily when hammered, what can be inferred about its malleability?
Which of the following properties is NOT associated with malleable materials?
Which of the following metal alloys is known for its excellent malleability?
Which method would most likely increase the malleability of a metal?
What happens to malleability as you increase the carbon content in steel?
Which of the following influences a material's malleability the most?
Which of these metals is known to be one of the least malleable?
Why are gold and silver popular in jewelry making in relation to malleability?
Which statement best describes a characteristic of malleable materials?
What is the term used to describe the property of metals that allows them to produce a ringing sound?
Which of the following materials is known for producing a dull sound when dropped?
Why do metals like bells produce a better sound compared to wood?
Which metal is commonly associated with the ringing sound of ghungroos?
What sound is typically produced when a metal coin is dropped on a hard surface?
Which of the following is a property of non-metals in relation to sound?
If a metal object and a wooden object are dropped from the same height, what distinguishes their sounds?
Which of the following metals is least likely to be sonorous?
Which physical property primarily affects the sonority of a material?
Which scenario best demonstrates the property of sonority?
How can you distinguish between sonorous and non-sonorous materials during an experiment?
Which musical instrument primarily relies on the sonority of metal?
What type of sound is produced by non-metals when struck?
In the context of sonority, what is a metal's ability to vibrate known as?
Which factor does NOT influence a material's sonority?
Why is sonority important in objects like school bells?
What property allows metals to be drawn into wires?
Which metal is known for being extremely ductile, allowing it to be drawn into long wires?
Why cannot non-metals like coal or sulfur be drawn into wires?
Which of the following applications is NOT commonly associated with ductile materials?
What is the significance of ductility in engineering materials?
Which of the following metals is typically used in electrical wiring due to its ductility?
In which of these does ductility play a critical role?
If a material shows high ductility, what would you expect it to do under stress?
What happens to ductility as temperature increases in metals?
Which type of wire is most commonly used in hanging light fixtures due to its ductility?
An example of a ductile metal that is often used in making jewelry is:
Which property differentiates ductile materials from those that are brittle?
If a metal is used for making a suspension bridge, what must its ductility allow for?
Which statement about ductility is true?
Which of the following materials is a good conductor of electricity?
Why does rubber protect electricians when they work with electricity?
What happens when you connect a copper wire to a battery and a bulb?
Which of the following materials would likely NOT make a light bulb glow when used in a circuit?
Which property of metal makes it a good conductor of electricity?
In a simple electric circuit, why is it important to use conductors?
What is the main reason that metals like copper and aluminum are used in electrical wires?
Which of these statements about conductors and insulators is incorrect?
Which of the following is primarily used to insulate electrical wires?
What effect does temperature have on conductors?
What is the reason for using steel wires in high-tension electricity transmission?
Why is it unsafe to use metallic objects to handle electrical appliances?
What is a typical characteristic of a superconductor?
Which material might be confusing for students regarding its conductivity due to its appearance?
What role does surface area play in the conduction of electricity?
What happens to iron when it comes into contact with both air and water?
Which condition prevents the iron nail from rusting in the experiment?
What property allows metals to conduct heat effectively?
What is the main cause of rust formation on iron objects?
Which of the following materials would be the best choice for making a cooking pot to ensure quick heating?
In the experiment using bottle A, what is the purpose of adding silica gel?
During an experiment, a metal spoon feels warmer than a wooden spoon after being in hot water. What does this demonstrate?
Why do old iron nails require scrubbing before the experiment?
If heat is applied to one end of a metal rod, how does heat transfer occur?
What type of change occurs when iron rusts?
Which of the following best describes why metals are commonly used for cooking utensils?
If an iron nail is fully submerged in water but sealed with oil, what is the expected outcome?
If a wooden chair is placed in a sunny spot, will it become hot? Why or why not?
Which factor is NOT necessary for iron to rust?
Which of the following is NOT a characteristic of materials that conduct heat well?
In bottle C of the experiment, why does rust form after some days?
In which of the following scenarios can conduction be observed?
What is the appearance of rust on iron?
Which of the following statements about thermal conductors is true?
What effect does humidity have on rust formation?
Which material among the following is known to be a good insulator?
How does covering iron nails with oil affect their rusting?
Why are metals often chosen over non-metals for cooking utensils?
What would be the best method to preserve an iron object from rusting?
Which material is the least effective for conducting heat?
Why is silica gel used in various products to prevent rust in iron?
If a metal fork and a plastic spoon are placed in hot soup, which one will feel hotter after a while?
What would you observe in bottle A, if all conditions are met properly?
What happens to conduction when an insulating layer is added to a metal pipe?
What is the primary reason metals are often used in heat exchangers?
Download and practice The World of Metals and Non-metals worksheets to improve problem-solving accuracy and speed for CBSE Class 7 Science exams.
This worksheet covers essential long-answer questions to help you build confidence in The World of Metals and Non-metals from Curiosity for Class 7 (Science).
Questions
Define malleability and explain its significance in everyday applications with examples.
Malleability is the property of metals that allows them to be hammered or rolled into thin sheets without breaking. This characteristic is significant because it enables the production of materials like aluminum foil, which is used for packaging and cooking. Other examples include gold and silver, which can be shaped into jewelry. Malleability is important in industries where shaping materials is needed for functionality. For instance, metal sheets used in construction are a result of malleable metal properties.
What is ductility? Provide examples of ductile materials and explain their uses.
Ductility is the ability of a material, typically metals, to be stretched into wires without breaking. Metals like copper and aluminum are known for their ductility, as copper is commonly used in electrical wiring due to its excellent conductivity. Ductile materials are vital in many applications, including making cables for bridges and heavy lifting equipment, allowing these items to endure stress without snapping.
Discuss the conductivity of metals and its importance in daily life.
Metals, such as copper and aluminum, are excellent conductors of heat and electricity. This property is crucial in household wiring and kitchen utensils, enabling efficient heat transfer and electricity flow. For example, metal pots heat evenly, ensuring food cooks properly, and electrical wires carry electricity effectively without overheating. This conductivity is leveraged in various technologies, making metals indispensable in modern life.
Explain the concept of rusting and the conditions necessary for it to occur.
Rusting is the chemical process that leads to the corrosion of iron when it reacts with oxygen and moisture in the environment. The formation of rust appears as reddish-brown patches on the metal surface. Rusting requires both water and oxygen, making it a concern for iron objects exposed to damp conditions. Methods like painting, galvanizing, or using oils help prevent rust formation, thereby prolonging the lifespan of metal items.
Identify and explain the differences between metals and non-metals based on their properties.
Metals are generally lustrous, malleable, ductile, and good conductors of heat and electricity. Examples include iron, copper, and aluminum. Non-metals, on the other hand, are usually dull, brittle, and poor conductors. Sulfur and carbon are examples. Metals can be shaped and drawn into wires, while non-metals cannot due to their brittleness, making them suitable for different applications in everyday life.
What are alloys, and why are they important in material engineering?
Alloys are mixtures of two or more metals or a metal and a non-metal, which enhance specific properties like strength, corrosion resistance, and malleability. For example, steel, an alloy of iron and carbon, is stronger than pure iron and is used in construction and machinery. Alloys are crucial in engineering as they offer enhanced performance for specific applications compared to pure metals.
Describe the role of metals and non-metals in environmental sustainability.
Metals and non-metals play significant roles in sustainability efforts. Metals like aluminum and steel are recyclable, reducing waste and energy consumption associated with new metal production. Non-metals like carbon are crucial in biological functions and materials like carbon fibers used in lightweight constructions. Sustainable practices in using these elements in renewable energy technologies, like solar panels, showcase their importance in reducing environmental impact.
How do properties of metals affect their use in household items?
The properties of metals significantly influence their selection for household items. For instance, because metals are good conductors of heat, metals like stainless steel and aluminum are used to make pots and pans. The malleability of metals allows for diverse kitchen tool shapes, and ductility is important for electrical wiring found in appliances. Choosing metals based on these properties ensures functionality, efficiency, and safety in household items.
Illustrate the impact of iron on civilization with historical examples.
Iron has greatly impacted civilization, particularly during the Iron Age when its use revolutionized tools and weapons. For example, iron tools enabled advanced farming techniques, leading to increased food production and population growth. Historical evidence from cultures such as the Harappans and ancient Indians demonstrates how iron facilitated construction, trade, and military advancements, ultimately shaping the course of human development.
Examine the use of metals in technology today and their future potential.
Metals play a significant role in current technology, especially in electronics, construction, and transportation. Copper is used in circuitry, while aluminum is valued for lightweight structures. Future innovations may include alloys designed for specific environmental challenges, such as heat resistance in aircraft materials or corrosion-resistant coatings for marine applications. The ongoing development of smart materials involving metal composites showcases metals' potential in future technological advancements.
This worksheet challenges you with deeper, multi-concept long-answer questions from The World of Metals and Non-metals to prepare for higher-weightage questions in Class 7.
Questions
Compare and contrast metals and non-metals based on their physical properties, providing at least three examples of each. Illustrate this comparison using a table.
Metals are generally lustrous, malleable, ductile, and good conductors of heat and electricity, whereas non-metals are typically dull, brittle, and poor conductors. Example metals include aluminum, copper, and iron, while examples of non-metals include sulfur, phosphorus, and oxygen. A comparison table can be structured to show properties side by side.
Explain the process of rusting of iron, including the conditions necessary for it to occur and methods to prevent rusting. Use diagrams to illustrate your explanation.
Rusting occurs when iron is exposed to both moisture and oxygen, forming iron oxide, which appears as a reddish-brown layer. To prevent rusting, methods like galvanization, painting, and oiling can be used. Diagrams illustrating the rusty iron and prevention methods would enhance understanding.
Discuss the importance of metals in agriculture, highlighting specific tools made of metals. Include reasons for the choice of metals used in these tools.
Metals like iron and aluminum are crucial in making agricultural tools such as plows, spades, and trowels because of their strength, durability, and rust resistance. The use of metals allows for effective farming and enhances crop production.
Describe the process of creating an electric circuit using conductors and insulators. Explain which materials from the given list can function effectively and why.
In an electric circuit, metals like copper and aluminum serve as conductors while materials like rubber and wood act as insulators. The conductivity of metals allows them to facilitate the flow of electric current, while insulators prevent leakage and protect from shock.
Investigate the role of malleability and ductility in the manufacturing of everyday items like cooking utensils and electrical wires. Provide examples and reasons.
Malleability allows metals to be shaped into various utensils like pans and pots, while ductility makes it possible to draw them into wires for electrical use. Gold's ductility contributes to making fine jewelry, while iron's malleability is key in tool production.
Compare the effects of air and water on metals versus non-metals using two contrasting examples from each category and explain the outcomes.
For instance, iron (metal) rusts when exposed to moist air while copper (metal) develops a greenish coat over time. On the other hand, materials like sulfur (non-metal) remain unchanged in dry air but can change in reaction to water. The chemical nature of rust formation and corrosion must be noted.
Explain how the properties of metals like conductivity and malleability are utilized in technological advancements, providing specific examples.
Metals like copper are used in electrical wiring due to excellent conductivity, while aluminum is used for lightweight structural components due to its malleability. These properties facilitate advancements in electrical and aeronautical technologies.
Describe the role of metals in ancient civilizations, focusing on iron and its impact on societal evolution, providing detailed examples.
Iron's introduction marked significant advancements in tools and agriculture, enhancing productivity and leading to societal progress. The Iron Pillar of Delhi serves as an example of ancient metallurgy and its corrosion resistance.
Discuss the differences in the acidic and basic nature of metal and non-metal oxides. Provide examples and write a balanced chemical equation for one reaction.
Metal oxides, like magnesium oxide, are typically basic, whereas non-metal oxides, like carbon dioxide, are generally acidic. A balanced equation can be: 2 Mg + O2 → 2 MgO. This captures the essence of their behaviors in aqueous solutions.
Explore the significance of the recycling of metals in contemporary society, noting environmental impacts and economic benefits.
Recycling metals such as aluminum and iron reduces energy consumption and conserves resources, leading to lower greenhouse gas emissions and economic savings related to mining and manufacturing. The importance and methods of recycling should be highlighted.
The final worksheet presents challenging long-answer questions that test your depth of understanding and exam-readiness for The World of Metals and Non-metals in Class 7.
Questions
Evaluate the implications of metal malleability in creating modern tools and structures.
Discuss how malleability benefits various industries, providing examples such as the manufacturing of kitchen utensils and construction tools. Weigh examples of metal versus non-metal applications.
Analyze the role of ductility in musical instruments and its impact on sound quality.
Debate the significance of ductile metals in creating stringed instruments versus other materials, exploring examples and their acoustic properties.
Discuss the environmental implications of metal corrosion and the methods to prevent it.
Evaluate the economic and ecological impacts of rusting on infrastructure, supporting your points with examples of prevention techniques like galvanization.
Evaluate how conductors and insulators are used in everyday electrical applications.
Analyze scenarios of different materials in electrical devices, discussing the significance of choosing metals over non-metals.
Assess the historical significance of iron in the evolution of civilization.
Examine how the use of iron tools compared to earlier metal tools influenced agricultural practices and societal structures.
Debate whether non-metals are undervalued in the context of daily life.
Present arguments on the importance of non-metals like oxygen and carbon in contrast to metals, using examples from different fields.
Investigate the role of metals in technology and innovation.
Challenge the reader to consider how advancements in metal applications have led to technological breakthroughs, providing specific recent examples.
Evaluate the methods used to recycle metals and their impact on sustainability.
Discuss the processes involved in metal recycling and the benefits for both the economy and the environment, giving concrete examples of materials recycled.
Assess the differences in reactivity of metals and non-metals with water and air.
Discuss phenomena such as rusting versus tarnishing and apply real-world examples to illustrate the importance of these differences in daily applications.
Critique the assertion that metals are entirely superior to non-metals.
Present a balanced view discussing situations where non-metals outperform metals, utilizing examples from health, agriculture, and environment.
Explore the properties of metals and non-metals in Class 7 Science. Learn about malleability, ductility, and the role of metals in daily life with hands-on activities.
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