Science Class IX: Metals and Non-Metals
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Questions and Answers

Which of the following statements about non-metals and metals is true?

  • Non-metals produce basic oxides in water.
  • Metals typically produce basic oxides when dissolved in water. (correct)
  • Non-metals do not react with oxygen.
  • Most metals produce acidic oxides when dissolved in water.

    • Which metal is known to be a liquid at room temperature?

  • Mercury (correct)
  • Magnesium
  • Iron
  • Lead

    • What is the main characteristic of a metal that is described as malleable?

  • It is a poor conductor of heat.
  • It can be hammered or pressed into shapes without breaking. (correct)
  • It has a high density.
  • It can be easily stretched into wires.

    • When metals are burned in air, which of the following products is typically formed?

    <p>Oxides</p> Signup and view all the answers

    What flame color is typically seen when magnesium burns in air?

    <p>White</p> Signup and view all the answers

    Which of the following transformations correctly describes a chemical property of metals?

    <p>Metals can easily form compounds with non-metals.</p> Signup and view all the answers

    Which of the following properties does not apply to metals?

    <p>Brittle at room temperature</p> Signup and view all the answers

    How do the products formed when metals are burned in air typically behave in water?

    <p>They are insoluble in water.</p> Signup and view all the answers

    Which metal reacts violently with cold water and causes the evolved hydrogen to catch fire?

    <p>Potassium</p> Signup and view all the answers

    Which metal is known to float when it reacts with water?

    <p>Calcium</p> Signup and view all the answers

    What is produced when a metal reacts with water?

    <p>Metal oxide and hydrogen gas</p> Signup and view all the answers

    Which of the following metals does NOT react with cold water?

    <p>Magnesium</p> Signup and view all the answers

    Which metal's reaction with water is less violent, but still produces hydrogen?

    <p>Calcium</p> Signup and view all the answers

    What happens to magnesium when it is placed in hot water?

    <p>It reacts to form magnesium hydroxide</p> Signup and view all the answers

    Which metals do not react even with steam?

    <p>Copper and Gold</p> Signup and view all the answers

    In what order should metals be arranged according to their reactivity with water?

    <p>Potassium, Sodium, Calcium, Magnesium</p> Signup and view all the answers

    What is the role of the anode in electrolytic refining?

    <p>It dissolves into the electrolyte.</p> Signup and view all the answers

    In the process of electrolytic refining, what happens to the soluble impurities?

    <p>They remain in the electrolyte solution.</p> Signup and view all the answers

    Which electrolyte is used during the electrolytic refining of copper?

    <p>Acidified copper sulphate solution.</p> Signup and view all the answers

    What is anode mud?

    <p>Insoluble impurities that settle at the bottom of the anode.</p> Signup and view all the answers

    Which of the following metals undergoes corrosion by reacting with sulphur in the air?

    <p>Silver.</p> Signup and view all the answers

    During the refining process, what happens to the pure metal at the cathode?

    <p>It is deposited from the electrolyte.</p> Signup and view all the answers

    What happens to copper when it reacts with moist carbon dioxide in the air?

    <p>It gains a green coat.</p> Signup and view all the answers

    Which of the following is true about the cathode in electrolytic refining?

    <p>It is a thin strip of pure metal.</p> Signup and view all the answers

    What is the composition of an alloy that is described as 22 parts of pure gold?

    <p>22 parts gold and 2 parts silver or copper</p> Signup and view all the answers

    Why are brass and bronze not considered good conductors of electricity?

    <p>Their electrical conductivity is less than that of pure metals.</p> Signup and view all the answers

    What is the primary use for solder, an alloy of lead and tin?

    <p>Welding electrical wires together</p> Signup and view all the answers

    What is defined as an amalgam in metallurgy?

    <p>An alloy containing mercury</p> Signup and view all the answers

    What process did ancient Indian iron workers develop to prevent rusting?

    <p>An unknown rust-resistant process</p> Signup and view all the answers

    What is the height of the iron pillar near the Qutub Minar in Delhi?

    <p>8 meters</p> Signup and view all the answers

    What weight does the iron pillar near the Qutub Minar approximately have?

    <p>6000 kg</p> Signup and view all the answers

    Which elements are combined to create brass?

    <p>Copper and zinc</p> Signup and view all the answers

    What is the term used to describe the shining surface of metals in their pure state?

    <p>Metallic lustre</p> Signup and view all the answers

    Which of the following metals is known to be soft and can be easily cut with a knife?

    <p>Sodium</p> Signup and view all the answers

    What is the primary method used to group substances based on their properties?

    <p>Physical properties</p> Signup and view all the answers

    Why is it necessary to handle sodium metal with care?

    <p>It is highly reactive</p> Signup and view all the answers

    What is the purpose of rubbing metal samples with sandpaper in Activity 3.1?

    <p>To clean the surface of the metal</p> Signup and view all the answers

    Which of the following metals is known to be hard and difficult to cut with a knife?

    <p>All of the above</p> Signup and view all the answers

    What is the purpose of striking a metal with a hammer in Activity 3.3?

    <p>To test its hardness</p> Signup and view all the answers

    What is the term used to describe the ability of a metal to be shaped or molded without breaking?

    <p>Malleability</p> Signup and view all the answers

    Study Notes

    Classification of Elements

    • Elements are classified into metals and non-metals based on their physical and chemical properties.
    • Understanding these classifications helps in identifying everyday uses of metals and non-metals.

    Physical Properties of Metals

    • Metals exhibit a shiny appearance known as metallic lustre when in pure form.
    • They are generally hard, with varying degrees of hardness.
    • Metals can be molded or shaped; they are described as malleable (can be hammered into sheets) and ductile (can be drawn into wires).

    Reactivity of Metals

    • Metals react with water, producing a metal oxide and hydrogen gas.
    • Reactivity varies: for example, potassium and sodium react violently with cold water, producing heat and igniting hydrogen.
    • Calcium reacts less violently with water, while magnesium does not react with cold water but does with hot water.

    Electrolytic Refining

    • Metals such as copper and zinc can be refined using electrolytic refining.
    • Impure metal acts as the anode, while a pure metal strip acts as the cathode in an electrolyte solution.
    • During the process, the pure metal from the anode dissolves and deposits on the cathode.

    Corrosion

    • Corrosion is the deterioration of metal due to chemical reactions, such as silver reacting with sulfide in the air or copper reacting with carbon dioxide.
    • Alloys, such as brass (copper and zinc) and bronze (copper and tin), exhibit different physical properties than their constituent metals.

    Historical Metallurgy Example

    • The Iron Pillar of Delhi, created over 1600 years ago, showcases advanced ancient Indian metallurgy techniques that prevented rusting.
    • This pillar is notable for its height (8 m) and weight (6000 kg), and it remains rust-resistant, drawing attention from scientists globally.

    Key Collaborative Questions and Definitions

    • Explore specific metals (liquid at room temperature, best conductor of heat, etc.) and their traits.
    • Definitions:
      • Mineral: A naturally occurring solid substance.
      • Ore: A naturally occurring solid material from which a metal can be extracted profitably.
      • Gangue: The worthless material surrounding an ore.
    • Recognize that some metals occur naturally in the free state, while others need extraction processes to be obtained from their ores.

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    Related Documents

    Metals and Non-metals Chapter 3 PDF

    Description

    This quiz covers Chapter 3 on Metals and Non-Metals from Class IX Science. Explore the properties, classifications, and everyday uses of these elements. Test your understanding of how these properties relate to their applications in daily life.

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