1.3 Factor affect reaction rate

The rate of a reaction is NOT affected by which of the following :

• concentration

• particle size (surface area)

• temperature

• all of these affect reaction rate

Increasing the concentration of the reactants will slow down the reaction

• true

• false

• maybe

• hmmm

Smaller particle size allows for a ____ surface area to be exposed for the reaction

• smaller

• larger

Increasing the temperature will increase the kinetic energy of particles, therefore increasing the collisions between particles.

• false
• true

What does the Arrhenius Equation primarily describe?

• The change in reaction rate with temperature

• The proportion of molecules with energy equal to activation energy

• The energy required to start a reaction

• The effect of catalysts on reaction rate

The activation energy of a chemical reaction is the energy:

• Released during the reaction

• Absorbed during the reaction

• Required to initiate the reaction

• That remains constant regardless of temperature

• 5.80 s^-1

• 0.580 s^-1

• 850 s^-1

• 8.50 s^-1

The graph shows a typical energy distribution for particles of an ideal gas in a sealed container at a fixed temperature.   Which of the following statements is true?

• Position A represents the mean energy of a molecule in the container.
• Addition of a catalyst moves the position of E_A to the right.
• The area under the curve to the right of E_A represents the number of molecules with enough energy to react.
• The position of the peak of the curve at a higher temperature is further away from both axes.

What is the activation energy?

• The energy of the products
• The energy of the reactants
• The minimum energy needed by the reactants to form the products.
• The energy lost in the reaction

• Curve II is at the lower temperature and there are less molecules in the sample

• Curve II is at the lower temperature and there are the same number of molecules in the sample

• Curve II is at the higher temperature and there are more molecules in the sample

• Curve II is at the higher temperature and there are the same number of molecules in the sample