How are metals made?
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Questions and Answers

What generalisations can be made about metals according to the text?

  • Metals are transparent, brittle, have high electrical resistance, and are dull in appearance.
  • Metals are malleable, ductile, dense, and can conduct electricity well. (correct)
  • Metals are gaseous, opaque, have high heat resistance, and feel warm to the touch.
  • Metals are mostly liquid, disorganized, weak, and light.

    • Why do most metals feel instantly cold to the touch?

  • Because they do not conduct electricity well.
  • Because they have high heat resistance.
  • Because they conduct heat well, carrying heat energy quickly away from the body. (correct)
  • Because they reflect all light wavelengths equally.

    • What typically happens to metal objects that are repeatedly stressed and strained?

  • They lose their density and conductivity.
  • They suddenly fracture due to metal fatigue. (correct)
  • They become stronger and more malleable.
  • They become more brittle and transparent.

    • Why do metals tend to have a shiny and silvery grey color?

    <p>Because they tend to reflect all light wavelengths equally.</p> Signup and view all the answers

    Which of the following is NOT a generalisation made about metals in the text?

    <p>Metals tend to be transparent to light.</p> Signup and view all the answers

    What is the first step in producing large quantities of metals like iron, aluminium, or copper?

    <p>Extracting an ore from a mine or quarry</p> Signup and view all the answers

    Why is extracting metals often difficult, dangerous, expensive, and polluting?

    <p>Mainly because metals are usually fused with oxygen and other compounds</p> Signup and view all the answers

    What is the purpose of smelting iron ore?

    <p>To roast it in air to remove impurities</p> Signup and view all the answers

    Which process involves separating a chemical solution into its constituent elements by passing an electric current through it?

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

    Why can't metals generally be found in the ground in their pure form?

    <p>Due to the presence of useless rock and oxides</p> Signup and view all the answers

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