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AP Intermediate 1st Year Chemical Bonding and Molecular Structure — practice questions — page 3

Explore 70 free Chemical Bonding and Molecular Structure questions in AP Intermediate 1st Year Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Bonding and Molecular Structure questions and exercises with answers

Showing questions 61–70 of 70.

Bond angle is the angle between orbitals containing bonding electron pairs around the:Read the answer and worked solution →In polyatomic molecules, which bond enthalpy term is used?Read the answer and worked solution →Why was the concept of resonance introduced?Read the answer and worked solution →The structures contributing to a resonance hybrid are called:Read the answer and worked solution →Lattice enthalpy is the energy required to separate one mole of an ionic solid into:Read the answer and worked solution →What is the lattice enthalpy of sodium chloride?Read the answer and worked solution →Ionic bonds form most easily between elements with low ionization enthalpies and high negative:Read the answer and worked solution →Why can lattice enthalpy not be calculated directly from attraction and repulsion alone?Read the answer and worked solution →Which theory is abbreviated VSEPR?Read the answer and worked solution →Besides VSEPR and the Kossel Lewis approach, which two theories are listed?Read the answer and worked solution →

Worked practice questions

Bond angle is the angle between orbitals containing bonding electron pairs around the:

  1. Coupled atom
  2. Coated atom
  3. Central atom
  4. Cornered atom
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Correct answer: C. Central atom

1. An angle needs a vertex. 2. In a molecule that vertex is one particular atom. 3. Bond angle is the angle between orbitals containing bonding electron pairs around the central atom. 4. So the answer is the central atom. _Source: syllabus Chemistry Part I, Unit 4 'Chemical Bonding and Molecular Structure'_

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In polyatomic molecules, which bond enthalpy term is used?

  1. Molar bond enthalpy
  2. Minimum bond enthalpy
  3. Mixed bond enthalpy
  4. Mean bond enthalpy
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Correct answer: D. Mean bond enthalpy

1. Identical bonds in one molecule need not be identical in energy. 2. A single representative figure is therefore quoted. 3. In polyatomic molecules the term mean or average bond enthalpy is used. 4. So the answer is mean bond enthalpy. _Source: syllabus Chemistry Part I, Unit 4 'Chemical Bonding and Molecular Structure'_

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Why was the concept of resonance introduced?

  1. One structure is inadequate
  2. One structure is inaccurate only
  3. One structure is inactive
  4. One structure is invisible
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Correct answer: A. One structure is inadequate

1. Some molecules do not match any single Lewis diagram. 2. Their measured parameters sit between the possibilities. 3. A single Lewis structure is often inadequate for representing a molecule in line with measurements. 4. So the answer is one structure is inadequate. _Source: syllabus Chemistry Part I, Unit 4 'Chemical Bonding and Molecular Structure'_

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