1. why is it key for colliding particles to ahve sufficient energy for a reaction to occur? a. all reactions are exother

[answerhappygod]

1. why is it key for colliding particles to ahve sufficient
energy for a reaction to occur?
a. all reactions are exothermic and need to release the
energy
b. all rxns are endothermic and need to absorb the energy
c. the collisions need to be strong enough to form the bonds of
the products
d. the collisions need to be strong enough to break the bonds of
the reactants
2. which statement describes a reaction in which the
concentration of the reactant is directly proportional to the
reaction rate?
a. if the concentration of the reactant is halved, the rxn rate
will double
b. if the concentration fo the reactant is doubled, the reaction
rate will double
c. if the concentration of the reactant is doubled, the reaction
rate will be halved
d. if the concentration of the reactant is changed, the reaction
rate will not be effected
3. which statement describes a result of lowering the activation
energy of a chemical reaction?
a. rate of rxn is decreased
b. rxn occurs at a lower temperature
c. txn requires higher temp to occur
d. products of rxn will be precipitates instead of aqueous
solutions