Unit 01: Elements, Compounds, and Mixtures
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Questions and Answers

What is the primary characteristic of an element?

  • It is composed of two or more different elements
  • It is a material composed of two or more simpler substances
  • It can be broken down into other substances by chemical reactions
  • It is a substance that cannot be broken down into other substances by chemical reactions (correct)
  • Which separation technique involves the conversion of a liquid into vapour that is subsequently condensed back to liquid form?

  • Crystallisation
  • Evaporation
  • Distillation (correct)
  • Filtration
  • What is the process of separating components of a liquid, especially ink?

  • Solubility
  • Chromatography (correct)
  • Filtration
  • Crystallisation
  • What is the term for the solidification of a liquid substance into a highly structured solid?

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

    What is the primary factor that affects the solubility of a substance?

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

    What is the process of separating an insoluble solid from a liquid through filter paper?

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

    What is the process of particles moving from an area of high concentration to an area of low concentration?

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

    What is the term for the average mass of all different isotopes of an element?

    <p>Relative atomic mass</p> Signup and view all the answers

    What is the result of the formation of a covalent bond between two atoms?

    <p>A shared pair of electrons</p> Signup and view all the answers

    What is the name of the process in which a solid changes directly into a gas?

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

    What is the outermost energy level of an atom called?

    <p>Valence shell</p> Signup and view all the answers

    What is the number of electrons required by Hydrogen and Helium to achieve a stable outer shell configuration?

    <p>2</p> Signup and view all the answers

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