In Which One of the Following Reactions Would You Expect

question 29

Multiple Choice

In which one of the following reactions would you expect ΔH to be substantially greater than ΔE (i.e., ΔH > ΔE) ?

• A)H ₂( g)+ Br ₂( g)→ 2HBr( g)
• B)CO ₂( s)→ CO ₂( g)
• C)C ₂H ₂( g)+ H ₂( g)→ C ₂H ₄( g)
• D)H ₂O( s)→ H ₂O( l)
• E)HCl( aq)+ NaOH( aq)→ NaCl( aq)+ H ₂O( l)

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Definitions:

Nonlinear Molecule

A molecule that does not have a straight-line or linear shape, often having a bent or three-dimensional structure.

Vibrational Modes

The different ways in which the atoms in a molecule can move relative to each other, important in the study of molecular IR spectroscopy.

Atoms

The smallest units of matter that retain the properties of an element, comprising protons, neutrons, and electrons.

Stretching Vibration

A vibrational movement in molecules where atoms move along the line of the bond, changing the bond length.