Base Physical Quantities and SI Units in Chemistry
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Questions and Answers

Which physical quantity is measured in amperes?

  • Electric current (correct)
  • Length
  • Time
  • Temperature

    • What is the SI unit for mass?

  • Pound
  • Liter
  • Kilogram (correct)
  • Gram

    • What is the SI unit for time?

  • Day
  • Hour
  • Second (correct)
  • Minute

    • Which physical quantity is measured in kelvin?

    <p>Temperature (C)</p> Signup and view all the answers

    Mass is defined by the fixed numerical value of which constant?

    <p>Planck constant (B)</p> Signup and view all the answers

    What is the SI unit for luminous intensity?

    <p>Candela (B)</p> Signup and view all the answers

    Why is scientific notation used in chemistry for expressing numbers?

    <p>To handle the wide range of measurements in chemistry (D)</p> Signup and view all the answers

    What allows the interconversion of results from one system of units to another?

    <p>Dimensional analysis (B)</p> Signup and view all the answers

    Which basic law of chemical combination specifically deals with the proportion of different elements in a compound?

    <p>Law of Definite Proportions (C)</p> Signup and view all the answers

    According to Dalton's atomic theory, what are the building blocks of matter?

    <p>Atoms (D)</p> Signup and view all the answers

    How is the atomic mass of an element usually expressed?

    <p>Relative to an isotope of carbon (D)</p> Signup and view all the answers

    What determines the molecular mass of a molecule?

    <p>Molecular formula (B)</p> Signup and view all the answers

    What is the science of molecules and their transformations?

    <p>Chemistry (D)</p> Signup and view all the answers

    How can chemistry be described according to Roald Hoffmann?

    <p>The science of molecules and their transformations (A)</p> Signup and view all the answers

    What is the main focus of chemistry according to the provided text?

    <p>Study of molecules and their transformations (A)</p> Signup and view all the answers

    Which concept involves describing and understanding nature through systematized knowledge?

    <p>Chemistry (B)</p> Signup and view all the answers

    Which term is used to classify different substances into elements, compounds, and mixtures?

    <p>Compounds (B)</p> Signup and view all the answers

    What is the science that involves the understanding of the characteristics of three states of matter?

    <p>Chemistry (B)</p> Signup and view all the answers

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