increasing concentration of substances in a chemical reaction will

Select one:

Aincrease reaction rate due to increased number of collision between particles.

Bdecrease reaction rate due to increased number of collision between particles.

Cincrease reaction rate due to increased energy of collision between particles.

Ddecrease reaction rate due to increased energy of collision between particles.

If the surface area of reactants is larger,

Select one:

Athe reaction rate is generally higher.

Bthe reaction rate is generally lower.

Cthe reaction rate is not affected.

Dthe rate-determining step is eliminated.

Decreasing the temperature of a reaction decreases the reaction rate because

Select one:

Adecreasing the temperature also decreases the pressure.

Bdecreasing the temperature may cause a reactant to solidify.

Cdecreasing the temperature decreases the concentration of reactants.

Ddecreasing the temperature lowers the average kinetic energy of the reactants.