I. A study of the rate of dimerization of butadiene (2C4H6 C8H12) gave the data
ID: 564604 • Letter: I
Question
I. A study of the rate of dimerization of butadiene (2C4H6 C8H12) gave the data shown in the table below Time (s) [C4H6 1600 3200 4800 6200 1.00 x 10 5.04 x 103 3.37 x 103 2.53 x 10-3 2.08 x 103 What is the average rate of disappearance of C4Hs between 1600 s and 3200 s? a. 1.04 x 10% Mis b. 1.28 x 10 Mis c. 2.08 x 106 Mis d. 3.10 x 106 M/s 2. How does the concentration of the reactants affect the rate of a chemical reaction? a. At lower concentrations, more of the molecules have enough energy to react with each other, which increases the rate of reaction. b. At lower concentrations, the solvent causes an increase in the rate of reaction. c. At higher concentrations, the reactant molecules are too close together to react, which slows the rate of reaction. d. At higher concentrations, more molecules are present to interact, which increases the rate of reaction.Explanation / Answer
1. Average rate= - [concentration at 3200 sec- concentration at 1600 sec]/[3200-1600]
Average rate = -[ 3.37 x 10^-3 - 5.04 x 10^-3]/1600
Average rate = 1.04 x 10^-6M/s
The answer is A.
2.Rate of chemcical reaction = K [concentration of reactants]
so the concentration of reactants is increases means more molecules are interact s.
Hence the rate of reaction is increases.