Reference no: EM131430303
The half-life of a reaction, t1/2, is the time it takes for the reactant concentration [A] to decrease by half. For example, after one half-life the concentration falls from the initial concentration [A]0 to [A]0/2, after a second half-life to [A]0/4, after a third half-life to [A]0/8, and so on.
For a first-order reaction, the half-life is constant. It depends only on the rate constant k and not on the reactant concentration. It is expressed as
t1/2=0.693k
For a second-order reaction, the half-life depends on the rate constant and the concentration of the reactant and so is expressed as
t1/2=1k[A]0
1. A certain first-order reaction (A→products ) has a rate constant of 1.00×10-2s-1 at 45 °C. How many minutes does it take for the concentration of the reactant, [A] , to drop to 6.25% of the original concentration? Express your answer with the appropriate units.
2. A certain second-order reaction (B→products ) has a rate constant of 1.25×10-3M-1⋅s-1 at 27 °C and an initial half-life of 286 s . What is the concentration of the reactant B after one half-life?
Evaluate drug therapy plans for cardiovascular disorders
: Alterations of the cardiovascular system can cause serious adverse events and may lead to death when not treated in a timely and safe manner. Unfortunately, many patients with cardiovascular disorders are unaware until complications appear. Consid..
|
Use social capital in leveraging their human capital
: Discuss the need for managers to use social capital in leveraging their human capital both within and across their firm. Also discuss the key role of technology in leveraging knowledge and human capital. Discuss FIVE factors that may determine effect..
|
Vapor pressure of pure water
: At 25C the vapor pressure of pure water is 23.76 mmHg and that of seawater is 22.98 mmHg. Assuming that seawater contains only NaCl, estimate its concentration. (HINT: Sodium chloride is a strong electrolyte.) The answer to this question is 0.93 m..
|
Compare four ps approach to marketing versus value approach
: Compare and contrast a four Ps approach to marketing versus the value approach (creating, communicating, and delivering value). Select and examine these approaches for at least one routine and non-routine problem
|
Constant and the concentration of the reactant
: For a second-order reaction, the half-life depends on the rate constant and the concentration of the reactant and so is expressed as
|
Recognize the interdependent nature
: Briefly discuss the three key activities in the strategic management process. Why is it important for managers to recognize the interdependent nature of these activities?
|
Calculate an effect size as well as post hoc power
: Calculate an effect size as well as post hoc power. Then write an APA-style paragraph reporting your results.
|
What are key purposes of measurement in managing performance
: Why are good performance qualifications such as perspective, benchmarking, sustainability, and delivery important? What are the key purposes of measurement in managing performance?
|
Balanced chemical equation and net ionic equation
: Use the solubility rules in Table 4.1 of your textbook to predict if the following reactions will form precipitates. If the reaction does not form a precipitate write "no reaction". For the reactions that form a precipitate, write the balanced c..
|