Select all of the correct statements about reaction rates from the choices below

Question

Select all of the correct statements about reaction rates from the choices below. The lower the rate of a reaction the longer it takes to reach completion. Solid catalysts do not affect reaction rates. Reaction rate constants decrease with increasing temperature. Reaction rates can show little change as masses of solid reactants increase. The fastest step in a reaction is called the rate-determining step. Reaction rate constants increase with increasing temperature. Reaction rates increase as reactant concentrations decrease.

Explanation / Answer

Rate of reaction are dependent on the temperature, some times pressure(if gases involved), size of particles (smaller goes faster) concentration of reactants, and in reversible reactions concentration of products.and presence of a catalyst which is not used up.

a) 1st is correct.

b) correct ( the rate of reaction incrase with increase in temperature...the rate becomes double with increase in temperature of 10c)

c)correct (A lower temperature will (increase/decrease) the value of the rate constant)

d) false . ( When solids and liquids react, increasing the surface area of the solid will ... changing the pressure for a reaction that involves only solids or liquids.)

e) correct (If the first step in a mechanism is rate-determining, it is easy to find the rate law for the overall expression from the mechanism)

f) correct

Temperature does affect the rate constant. An increase in temperature will always increase the rate of a reaction since the particles will have more kinetic energy and there would be more productive collisions.
The value of the rate constant will hence increase. The increase in rate constant with temperature is exponential, meaning that every time the temperature increases by a certain number of degrees, the rate constant increases by a fixed factor.

g)correct

A lower temperature will (increase/decrease) the value of the rate constan

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