18.2: The Progress of Chemical Reactions

The specific rate constant (k) for a reaction is a proportionality constant relating the concentrations of reactants to the rate of the reaction.

• True

• False

Tags

NGSS.HS-PS1-5

In a first-order reaction, the rate is directly proportional to the concentration of only ………………………

• one reactant.

• two reactants.

• more than two reactants.

Tags

NGSS.HS-PS1-5

If the rate of a reaction is:

Rate = k [A] [B]

• The order of reaction with respect to both A and B is 1.

  The overall order of the reaction is 2

• The order of reaction with respect to both A and B is 1.

  The overall order of the reaction is 1

• The order of reaction with respect to both A and B is 0.

  The overall order of the reaction is 2

Tags

NGSS.HS-PS1-5

A graph of all the energy changes that occur as reactants are converted to products in a chemical reaction.

• A reaction progress curve

• A reaction heating curve.

• A reaction cooling curve

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-2

An elementary reaction is a reaction in which reactants are converted to products in two steps.

• True

• False

An elementary reaction has only one activation-energy peak and one activated complex.

• True

• False

Tags

NGSS.HS-PS1-5

An intermediate has a more stable structure and a longer lifetime than an activated complex.

• True

• False

Intermediates appear in the overall chemical equation for a reaction.

• True

• False

In a multistep chemical reaction, the fastest step will determine, or limit, the rate of the overall reaction.

• True

• False

If the rate of a reaction is:

Rate = k [B]²

• This reaction is zero order with respect to B

  The order with respect to A is 2.

  The overall order of the reaction is 0

• This reaction is zero order with respect to A

  The order with respect to B is 2.

  The overall order of the reaction is 2

• This reaction is zero order with respect to A

  The order with respect to B is 2.

  The overall order of the reaction is 0

Tags

NGSS.HS-PS1-5