CHM101 General Chemistry I Lecture Note Three

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Questions and Answers

According to valence bond theory, what is the valency of beryllium, boron, and carbon respectively?

  • Monovalent, divalent, zero
  • Divalent, zero, monovalent
  • Divalent, monovalent, zero
  • Zero, monovalent, divalent (correct)

What is the concept of orbital hybridization in Chemistry?

  • The concept of mixing atomic orbitals to form a new pure orbital
  • The concept of mixing atomic orbitals to form a new hybrid orbitals suitable for pairing of electrons in a chemical bonds (correct)
  • The concept of separating atomic orbitals to form a new hybrid orbitals
  • The concept of pairing electrons in atomic orbitals

What is the electronic configuration of boron?

  • 1s2 2s2 2p3
  • 1s2 2s2 2p1 (correct)
  • 1s2 2s1 2p3
  • 1s2 2s1 2p2

How many unpaired electrons does the atom of carbon (Z = 6) have?

<p>2 (C)</p> Signup and view all the answers

In reality, what valency do these elements form compounds with?

<p>2, 3, 4 (C)</p> Signup and view all the answers

According to the modern atomic theory postulated by John Dalton, which of the following statements is NOT true?

<p>Atoms of the same element are different (D)</p> Signup and view all the answers

Which scientist is credited with postulating the modern atomic theory?

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

In the modern atomic theory, what is the role of atoms in forming compounds?

<p>Atoms combine in fixed ratios to form compounds (D)</p> Signup and view all the answers

What did John Dalton consider as the fundamental role of atoms in chemistry?

<p>Composition of matter (D)</p> Signup and view all the answers

What did John Dalton consider as the basis of chemistry?

<p>The concept of atoms (A)</p> Signup and view all the answers

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