The Introduction Should Take No More Than

question 27

Multiple Choice

The introduction should take no more than

• A)10-15% of your total speaking time.
• B)15-20% of your total speaking time. 
• C)30-45 seconds.
• D)1-1 1/2 minutes.

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Definitions:

Acetone

A volatile, colorless liquid used as a solvent and an antiseptic; it's the simplest and most important of the ketones.

ΔH°

The standard enthalpy change of a reaction, indicating the overall heat absorbed or released under standard conditions.

Bond Dissociation Energies

The energy required to break a specific chemical bond in a molecule, indicating the strength of the bond.

Initiation Step

The first stage in a chemical reaction where reactants begin to form intermediates.