Basic Principles of Chemistry
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Questions and Answers

What type of electrons usually do not participate in chemical reactions?

  • Core electrons (correct)
  • Orbital electrons
  • Valence electrons
  • Atomic electrons
  • According to Kekulé and Couper, how many bonds does carbon typically form in stable compounds?

  • Two bonds
  • Three bonds
  • Four bonds (correct)
  • Five bonds
  • Which scientist proposed the concept of a carbon-carbon triple bond?

  • Emil Erlenmeyer (correct)
  • Archibald Couper
  • Jacobus van’t Hoff
  • Alexander Crum Brown
  • In what year did Kekulé propose that carbon chains can form rings of atoms?

    <p>1865</p> Signup and view all the answers

    According to van’t Hoff, how are the four atoms to which carbon is bonded oriented?

    <p>At the corners of a regular tetrahedron</p> Signup and view all the answers

    What denotes stability in a stable atomic arrangement?

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

    According to Dalton's atomic theory, elements are composed of:

    <p>Indivisible particles called atoms</p> Signup and view all the answers

    Which of the following statements is consistent with Dalton's atomic theory?

    <p>Atoms of the same element are identical in mass and properties</p> Signup and view all the answers

    What does Dalton's atomic theory imply about the number of atoms during a chemical reaction?

    <p>The total mass of atoms remains constant during a chemical reaction</p> Signup and view all the answers

    Which concept is NOT derived from Dalton's atomic theory?

    <p>Atomic Structure</p> Signup and view all the answers

    What principle related to chemical reactions is consistent with Dalton's atomic theory?

    <p>Matter is conserved in chemical reactions</p> Signup and view all the answers

    In Dalton's atomic theory, what is the significance of atoms being indivisible?

    <p>Atoms have a fixed mass and properties</p> Signup and view all the answers

    According to Dalton's atomic theory, which statement is true about atoms of the same element?

    <p>They are identical in size, mass, and chemical properties.</p> Signup and view all the answers

    In a compound, what is the ratio of the numbers of atoms of any two different elements present?

    <p>A simple fraction</p> Signup and view all the answers

    Which law states that different samples of the same compound always contain its constituent elements in the same proportion by mass?

    <p>Law of definite proportions</p> Signup and view all the answers

    What is the composition of an atom according to the experiments conducted by scientists?

    <p>Dense, positively charged nucleus surrounded by negatively charged electrons</p> Signup and view all the answers

    The Law of conservation of mass states that:

    <p>The total mass of substances present at the end of a chemical process remains constant.</p> Signup and view all the answers

    What is the charge on neutrons, protons, and electrons respectively?

    <p>Neutrons - neutral, Protons - positive, Electrons - negative</p> Signup and view all the answers

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