Homework Help: chemistry

Posted by Sarah on Monday, January 18, 2010 at 1:20pm.

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
B) double
C) quadruple

chemistry - DrBob222, Monday, January 18, 2010 at 3:31pm
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.

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