Plenary 15.1 - A Model for Reaction Rates

Which is NOT part of collision theory?

• Reacting substances must collide at a high rate.

• Reacting substances must collide in the correct orientation.

• Reacting substances (atoms, ions, or molecules) must collide.

• Reacting substances must collide with sufficient energy to form an activated complex.

Which best describes an exothermic reaction?

• energy absorbed, products at lower energy level

• energy absorbed, products at higher energy level

• energy released, products at higher energy level

• energy is released, products at lower energy level

Which of the following is NOT true?

• If ΔG is negative, the reaction is spontaneous.

• If ΔG is positive, the reaction is not spontaneous.

• If ΔG is negative, the reaction is not spontaneous.

• ΔG is related to change in free energy.

Which is true of a high activation energy?

• The reaction rate is fast.

• The reaction rate is slow.

• Most of the collisions have the required energy to produce the activated complex.

• None of the collisions have the required energy to produce the activated complex.

Which is NOT true of the reaction rate of a chemical reaction?

• It is the change in concentration of reactant or product over time.

• It is generally expressed as mol/(L · s).

• It is determined experimentally.

• It can be calculated from a balanced equation.

Which of the following is NOT a requirement for a reaction to occur, according to the collision theory?

• Reacting substances must collide.

• Reacting substances must be in an  exothermic reaction.

• Reacting substances must collide in the   correct orientation.

• Reacting substances must collide with   sufficient energy to form an activated complex.

A temporary, unstable arrangement of atoms in which old bonds are breaking and new bonds are forming is called ____.

• reaction substrate

• activated complex

• activated molecule

• reaction complex