Chapter 8 Multiple-choice questions

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. Which one of the following statements concerning the length of carbon-carbon single, double, and triple covalent bonds is true?

The carbon-carbon single bond is shorter than either the carbon-carbon double or triple bond. correct incorrect

The carbon-carbon double bond is shorter than either the carbon-carbon single or triple bond. correct incorrect

The carbon-carbon triple bond is shorter than either the carbon-carbon single or double bond. correct incorrect

The carbon-carbon single, double, and triple bonds all have the same length. correct incorrect

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. Which one of the following is the correct bond angle between atoms adopting a trigonal planar geometry?

180° correct incorrect

109.5° correct incorrect

90° correct incorrect

120° correct incorrect

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. The atoms in a molecule of water adopt what kind of geometry?

Linear correct incorrect

Tetrahedral correct incorrect

Octahedral correct incorrect

Trigonal planar correct incorrect

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. Ammonia, NH₃, adopts a tetrahedral geometry. However, the non-bonding pair on the central nitrogen atom distorts the bond angle away from the expected 109.5°. Which of the following statements correctly describes how the bond angle is distorted?

The actual bond angle is reduced: it is less than 109.5° correct incorrect

The actual bond angle is increased: it is more than 109.5° correct incorrect

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. About which of the bonds along the backbone of a polypeptide is rotation not possible?

1 correct incorrect

2 correct incorrect

3 correct incorrect

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. sp³ hybridisation involves the hybridisation of how many atomic orbitals?

1 correct incorrect

2 correct incorrect

3 correct incorrect

4 correct incorrect

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. Four sp³ hybrid orbitals adopt what kind of geometry?

Linear correct incorrect

Trigonal planar correct incorrect

Octahedral correct incorrect

Tetrahedral correct incorrect

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. When applying VSEPR theory to predict molecular shape, which of the following do we not need to take into account?

Valence electrons occupying sigma bonding orbitals correct incorrect

Valence electrons occupying pi bonding orbitals correct incorrect

Valence electrons occupying non-bonding orbitals correct incorrect

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. Which of the following statements regarding the measurement of the atomic radius are correct? Please select all that apply.

The atomic radius is measured between atoms of different elements correct incorrect

The atomic radius is measured between atoms of the same element correct incorrect

The atomic radius is half the distance between the nuclei of two joined atoms correct incorrect

The atomic radius is the distance between the nuclei of two joined atoms correct incorrect

The atomic radius is only measured between two covalently-bonded atoms correct incorrect

The atomic radius can be measured between both covalently- and ionically-bonded atoms correct incorrect

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. From the following possible responses, select those responses that give the combination of bonds that makes up a triple covalent bond.

Two sigma bonds correct incorrect

One sigma bond correct incorrect

Two pi bonds correct incorrect

One pi bond correct incorrect

Three sigma bonds correct incorrect

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. The hydrogen atoms shown in this molecule occupy the axial position. True or false?

True correct incorrect

False correct incorrect