posted by Sarah .
1. Chemical reactions may occur when two different molecules collide. The frequency and energy of the collisions determine how many reactions occur. How would you expect that frequency of collisions in a gas to change if the temperature changes from 293 K to 303 K (20°C to 30°C)?
A) 0% increase
B) 2% increase
C) 20% increase
D) 100% increase
2. What increase in reaction rate would you expect between two gaseous chemicals if the total pressure in the reaction vessel is doubled?
A) no change
1. Isn't there a rule somewhere in kinetics that says something about "doubling the rate of reaction for every 10 degrees change in T?" So what percent would that be?
2. I don't like any of the choices. Doubling the pressure is the same as doubling the concentration and that will increase the rate of reaction. A is out. B is the best choice but the exact rate change depends upon the order of the reaction and/or on the kind of reaction; i.e., a reaction between the same particles or a reaction between different particles. Check my thinking.