Which is not true regarding reaction rates? (2 points)
1 answer:
Let us consider each statement one by one
a) Catalysts are the substance which alter the reaction pathway where activation energy of reaction is less that the un catalyzed reaction. They are not used up in the reaction . the catalyst is restored in the reaction.
b) As mentioned above, the catalyst speed up reaction by lowering the activation energy
c) During a reaction the reactants are consumed up and products are formed. so there is a decrease in concentration of reactant.
Thus all the above statements are true.
D) the rate of decrease in concentration of reactants depends upon the coefficient of reactant in balanced chemical reaction.
For example
Here the rate of decrease in concentration of hydrogen will be double the rate of decrease in concentration of oxygen.
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Answer:
The correct answer is:
An electron will be emitted in the second experiment, but it cannot be determined whether it will reach the second plate.
Explanation:
In fact, violet has higher frequency than green light. This means that photons on violet carry more energy than photons of green light (remember that the energy of a photon is proportional to it's frequency:
, so when they hit the surface of the metal, more energy is transferred to the electrons. The electron was already emitted with green light, so it must be emitted with also violet light, given the more energy transferred.