Answer to Question #171514 in General Chemistry for Amy

Question

C₂H₄ + H₂ → C₂H₆

C₂H₄(g) is reduced by H₂(g) in the presence of a solid platinum catalyst, as represented by the equation above. For each of the following, explain why each factor would or would not increase the rate of the reaction. Be clear about if the change would or would not increase the rate

a.)Increase in temperature of the system

b.)Decrease the available surface area of the platinum 

c.)Increase the volume of the reaction container 

d.)Increase the concentration of C₂H₆ (g) to the system

Answer 1

a)With an increase in temperature, the energy of the colliding particles will increase, it is obvious that with an increase in temperature, the chemical process itself will accelerate

b)Such a characteristic as the contact surface area of solid reagents affects the course of the reaction, sometimes quite significantly. thus, the grinding of a solid substance allows you to increase the contact surface area of the reagents, and therefore speed up the process. The contact area of the soluble substances is easily increased by the dissolution of the substance

c)The molar concentration of a homogeneous reaction occurring in the gas phase is inversely proportional to the volume of the reaction vessel. Therefore, with an increase in the volume of the reaction vessel by n times, the molar concentration of the reagents will decrease by n times.

d)An increase in the concentration of the products shifts the chemical equilibrium towards the reverse reaction, but does not increase the rate of the initial reaction