- For a zero-order reaction, the mathematical expression that can be employed to determine the half-life is: t
1 / 2
= [R]
0
/2k. - For a first-order reaction, the half-life is given by: t
1 / 2
= 0.693/k. - For a second-order reaction, the formula for the half-life of the reaction is: 1/k[R]
0
What is the half-life for the zero order reaction?
For a zero order reaction (
Half life decreases with decreasing concentration
.) For a 1st order reaction (Half life is constant.) For a second order reaction (Half life increases with decreasing concentration.)
How do you calculate the half-life of a reaction?
- For a zero-order reaction, the mathematical expression that can be employed to determine the half-life is: t
1 / 2
= [R]
0
/2k. - For a first-order reaction, the half-life is given by: t
1 / 2
= 0.693/k. - For a second-order reaction, the formula for the half-life of the reaction is: 1/k[R]
0
What is the formula for a zero order reaction?
The rate law
What is the easiest way to calculate half-life?
How to calculate half life? To find half-life:
Divide ln 2 by the decay constant of the substance
.
What is half-life period of reaction?
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.
What is 1st order reaction?
:
a chemical reaction in which the rate of reaction is directly proportional to the concentration of the reacting substance
— compare order of a reaction.
Do zero order reaction depends on concentration?
In a zeroth-order reaction,
the reaction rate does not depend on the reactant concentration
.
What is second order reaction give example?
Second-order reactions generally have the form
2A → products or A + B → products
. Simple second-order reactions are common. In addition to dimerization reactions, two other examples are the decomposition of NO
2
to NO and O
2
and the decomposition of HI to I
2
and H
2
.
Which of the following does half-life measure?
Half-life, in radioactivity,
the interval of time required for one-half of the atomic nuclei
What is the half-life symbol called?
The Lambda logo (λ)
is a symbol found frequently in the Half-Life universe. It represents the Greek letter “Λ” (lowercase “λ”), and is a radioactive decay constant used in the half-life equation.
What is half-life period of reaction write its formula?
The half-life of a reaction is the time required for the reactant concentration to decrease to one-half its initial value. The half-life of a first-order reaction is a constant that is related to the rate constant for the reaction:
t
1 / 2
= 0.693/k
.
What happens to the half-life period of first order reaction?
For a zero order reaction (Half life decreases with decreasing concentration.) For a 1st order reaction (
Half life is constant
.) For a second order reaction (Half life increases with decreasing concentration.)
What causes a first order reaction?
If
a plot of reactant concentration versus time is not linear but a plot of the natural logarithm of reactant concentration versus time is linear
, then the reaction is first order.
How do you recognize a first order reaction?
To test if it the reaction is a first-order reaction,
plot the natural logarithm of a reactant concentration versus time and see whether the graph is linear
. If the graph is linear and has a negative slope, the reaction must be a first-order reaction.
What are the examples of zero order reaction?
- The reaction of hydrogen with chlorine also known as a Photochemical reaction. H
2
+ Cl
2
→ 2HCl. Rate = k[H
2
]
0
[Cl
2
]
0
… - Decomposition of nitrous oxide on a hot platinum surface. N
2
O → N
2
+ 1/2 O
2
… - Decomposition of NH3 in the presence of molybdenum or tungsten is a zero-order reaction.
