Admin Table of Contents
- 1 What does a second order reaction depend on?
- 2 What happens when a second order reaction is halved?
- 3 Does the half-life of a second order reaction depends on the initial concentration?
- 4 On what factor does the half-life period of a first order reaction depends?
- 5 Does half-life depend on concentration?
- 6 Does the half life of a second order reaction depends on the initial concentration?
What does a second order reaction depend on?
A second-order reaction will depend on the concentration(s) of one second-order reactant or two first-order reactants.
What happens when a second order reaction is halved?
Second Order The rate is proportional to the square of the concentration. If you double the concentration, you multiply the rate by four. If you triple the concentration, you multiply the rate by nine. If you halve the concentration, you divide the rate by four, and so on.
How does half-life change with order?
If two reactions have the same order, the faster reaction will have a shorter half-life, and the slower reaction will have a longer half-life. Thus, for a first-order reaction, each successive half-life is the same length of time, as shown in Figure 1, and is independent of [A].
Does reaction rate depend on order?
A rate law shows how the rate of a chemical reaction depends on reactant concentration. For a reaction such as aA → products, the rate law generally has the form rate = k[A]ⁿ, where k is a proportionality constant called the rate constant and n is the order of the reaction with respect to A.
Does the half-life of a second order reaction depends on the initial concentration?
Reaction Rate Notice that the half-life of a second-order reaction depends on the initial concentration, in contrast to first-order reactions. For this reason, the concept of half-life for a second-order reaction is far less useful.
On what factor does the half-life period of a first order reaction depends?
First-Order Kinetics Equation 2.4. 4 shows that for first-order reactions, the half-life depends solely on the reaction rate constant, k. We can visually see this on the graph for first order reactions when we note that the amount of time between one half life and the next are the same.
How do the half lives of first order and second order reactions differ?
If we plot the concentration of a reactant versus time, we can see the differences in half lives for reactions of different orders in the graphs. For a 1st order reaction (Half life is constant.) For a second order reaction (Half life increases with decreasing concentration.)
What determines the order of a reaction?
The Order of Reaction refers to the power dependence of the rate on the concentration of each reactant. Thus, for a first-order reaction, the rate is dependent on the concentration of a single species. The order of reaction is an experimentally determined parameter and can take on a fractional value.
Does half-life depend on concentration?
The half-life of a reaction is the time required for a reactant to reach one-half its initial concentration or pressure. For a first-order reaction, the half-life is independent of concentration and constant over time.