Transcript Content Standard: Cite evidence to support the fact that some

Objective:
Identify and describe factors that
influence reaction rates.
Warm-up:
Why do we keep food in the
refrigerator?
How Can You
Speed Up or
Slow Down a
Reaction ?
Experiment 1: The Effect of Temperature on Reaction Rates
Summary:
As the temperature increases, the rate of reaction…increases
Questions:
1. At a temperature of 10 degrees C, it would take ______
seconds for 1 Alka-Seltzer tablet to react with 8 oz. of water.
2. If the temperature is doubled from 20 degrees C to 40
degrees C, the time for the rate of reaction ______by
approximately _______.
3. Using hot tap water, the rate was ______ times faster than
at 0 degrees C.
Experiment 2: The Effect of Particle Size on Rate of Reaction
Particle Size Time for Reaction to be Completed
Whole Tablet _________ Seconds
8 Pieces _________Seconds
Powder _________Seconds
Experiment 2: The Effect of Particle Size on Rate of Reaction
Summary:
a) As particle size decreases, the rate of reaction ___________.
increases
b) The rate of reaction for the powder was ___________ times
faster than for the whole tablet.
Questions:
1. As particle size decreases, the total surface area of a
increases
reactant ________________.
As a result, the probability of
increases
interactions between atoms/ions ________________,
and the
increases
rate of reaction ___________________.
less
2. Particle size appears to have _______________
(less or
more) of an effect on the rate of reaction than temperature.