Does the reaction rate of a zero order reaction becomes half of its initial value,if the concentration of the reactant becomes half of its initial value?
I copied the following from Google.
Image result for zero order reaction rate
In some reactions, the rate is apparently independent of the reactant concentration. The rates of these zero-order reactions do not vary with increasing nor decreasing reactants concentrations. This means that the rate of the reaction is equal to the rate constant, k, of that reaction.
So this is not common to all reactions?
Today morning we had a Chemistry exam and we were given this question.
I can't remember the all but,
1)k
2)k/2
3)R
4)R/2
were there in the answers,where k and R are the reaction constant and the reaction rate of the reaction.
So in this what would be the answer?
I took the answer as "1(k) " considering the reasoning you've got from Google.
So what would you choose if you got this question?
The question didn't mention about any special reaction too.They've just given that this is a zero order reaction.
Yes, the reaction rate of a zero-order reaction becomes half of its initial value if the concentration of the reactant becomes half of its initial value. In a zero-order reaction, the rate of the reaction is independent of the concentration of the reactant. This means that changing the concentration of the reactant will not affect the reaction rate, unlike in first-order or second-order reactions where the rate depends on the concentration.
To understand why the reaction rate is unaffected by the reactant concentration in a zero-order reaction, we need to examine the rate equation. The rate equation for a zero-order reaction can be written as:
Rate = k
Where:
- Rate represents the reaction rate
- k is the rate constant
In this case, the rate constant, k, is the only factor that determines the rate of the reaction. It is usually determined experimentally. Since the concentration of the reactant does not appear in the rate equation, changes in its concentration would not affect the reaction rate.
However, if the concentration of the reactant is reduced to half of its initial value, the rate will also be reduced to half, assuming the rate constant remains constant. This is because the rate constant, k, remains the same and the concentration is the only variable that changes. Thus, if the reactant concentration decreases by half, the reaction rate will also decrease by half in a zero-order reaction.