Homework Answers
After n half lives,
N/No = (1/2)^n
1/16 = (1/2)^n
(1/2)^4 = (1/2)^n
n = 4
It takes 4 half lives.
Time taken = 4*half life
= 4*9.09*10^8 s
= 3.64*10^9 s
Answer: False
Add Answer to:
If the half-life, 11/2, of 90 Sr is 9.09 x 108s, it would take 3.64 x...
Question 3 (4 points) A positron has the same charge as an electron, just a different...
Question 3 (4 points) A positron has the same charge as an electron, just a different mass. True False O Question 4 (4 points) If the half-life, 14/2, of Sr is 9.09 x 10's, it would take 3.64 x 10's of time to transpire in order for 90Sr to drop to 16th of its original amount. * True False
Sr-90 has a half-life of 29.1 years. How long will it take for the activity of...
Sr-90 has a half-life of 29.1 years. How long will it take for the activity of a Sr-90 sample to decay from 5.3 times 10^3 dpm (disintegrations per minute) to 3 times 10^2 dpm? The half-life of a radioisotope is 3 d. What percent remains after 1 week?
+ Half-life for First and Second Order Reactions 11 of 11 The half-life of a reaction,...
+ Half-life for First and Second Order Reactions 11 of 11 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-Me the concentration falls from the initial concentration (Alo to A\o/2, after a second half-life to Alo/4 after a third half-life to A./8, and so on. on Review Constants Periodic Table 11/25 For a second-order reaction, the half-life depends on the rate constant and the...
Half-life equation for first-order reactions: t1/2=0.693k where t1/2 is the half-life in seconds (s), and k...
Half-life equation for first-order reactions: t1/2=0.693k where t1/2 is the half-life in seconds (s), and k is the rate constant in inverse seconds (s−1). a) What is the half-life of a first-order reaction with a rate constant of 4.80×10−4 s−1? b) What is the rate constant of a first-order reaction that takes 188 seconds for the reactant concentration to drop to half of its initial value? Express your answer with the appropriate units. c)A certain first-order reaction has a rate constant...
ivity of 3.50 10 Bq. It has a half-life of Asample with 4.0×1015 atoms has an...
ivity of 3.50 10 Bq. It has a half-life of Asample with 4.0×1015 atoms has an acti 600 years 5. (a) How much is the decay constant? (2 marks (b) How much time will it take to drop to one-quarter of its original amount? (2 marks)
The half-life of a reaction, t1/2, is the time it takes for the reactant concentration [A]...
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. 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...
(4 points) The half-life of radioactive strontium-90 is approximately 32 years. In 1964, radioactive strontium-90 was...
(4 points) The half-life of radioactive strontium-90 is approximately 32 years. In 1964, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it take until only 9 percent of the original amount absorbed remains? time = 1 years
For a first-order reaction, the half-life is constant. It depends only on the rate constant k...
For a first-order reaction, the half-life is constant. It depends only on the rate constant k k and not on the reactant concentration. It is expressed as t1/2=0.693k t 1 / 2 = 0.693 k 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. A certain first-order reaction (A→products A → p r o d u c t s ) has a rate constant of 9.30×10−3...
For a first-order reaction, the half-life is constant. It depends only on the rate constant k...
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 t 1/2 = 0.693 k For a second-order reaction, the half-life depends on the rate constant and the concentration of the reactant and so is expressed as t 1/2 = 1 k[A ] 0 Part A A certain first-order reaction ( A→products ) has a rate constant of 9.90×10−3 s −1 at 45 ∘...
2. Half-life is the time required for half of an amount of a particular compound to...
2. Half-life is the time required for half of an amount of a particular compound to degrade (see table below). The half-life of DDT in the soilis from 2 to 15 years, and the half-lite of DDT in an aquatic environment is 150 years. 1 half-life 2 half-lives 3 half-lives 4 half-lives 5 half-lives 50% degraded 75% degraded 88% degraded 94% degraded 97% degraded a. If the original concentration of DDT in the water is 2 ppm, how much DDT...
Question 3 (4 points) A positron has the same charge as an electron, just a different mass. True False O Question 4 (4 points) If the half-life, 14/2, of Sr is 9.09 x 10's, it would take 3.64 x 10's of time to transpire in order for 90Sr to drop to 16th of its original amount. * True False
Sr-90 has a half-life of 29.1 years. How long will it take for the activity of a Sr-90 sample to decay from 5.3 times 10^3 dpm (disintegrations per minute) to 3 times 10^2 dpm? The half-life of a radioisotope is 3 d. What percent remains after 1 week?
+ Half-life for First and Second Order Reactions 11 of 11 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-Me the concentration falls from the initial concentration (Alo to A\o/2, after a second half-life to Alo/4 after a third half-life to A./8, and so on. on Review Constants Periodic Table 11/25 For a second-order reaction, the half-life depends on the rate constant and the...
ivity of 3.50 10 Bq. It has a half-life of Asample with 4.0×1015 atoms has an acti 600 years 5. (a) How much is the decay constant? (2 marks (b) How much time will it take to drop to one-quarter of its original amount? (2 marks)
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. 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...
(4 points) The half-life of radioactive strontium-90 is approximately 32 years. In 1964, radioactive strontium-90 was released into the atmosphere during testing of nuclear weapons, and was absorbed into people's bones. How many years does it take until only 9 percent of the original amount absorbed remains? time = 1 years
2. Half-life is the time required for half of an amount of a particular compound to degrade (see table below). The half-life of DDT in the soilis from 2 to 15 years, and the half-lite of DDT in an aquatic environment is 150 years. 1 half-life 2 half-lives 3 half-lives 4 half-lives 5 half-lives 50% degraded 75% degraded 88% degraded 94% degraded 97% degraded a. If the original concentration of DDT in the water is 2 ppm, how much DDT...
Most questions answered within 3 hours.
-
D. A student completed 20 courses in the School of Arts and
Sciences. Her grades in...
asked 1 hour ago -
teo
pucks moving on a frictionless air table are about to collide. the
1.5 kg puck...
asked 1 hour ago -
Problem #1
The area between Z = 0 and Z = 2.50
The area between Z...
asked 3 hours ago -
1. What is the meaning of the term communication style?
2. What are the benefits to...
asked 2 hours ago -
9.) You are buying a car that cost $26,500. You make payments of
$412 each month...
asked 2 hours ago -
. Suppose a discrete random variable has probability
distribution
P(x) = .2 if x = 0...
asked 4 hours ago -
Under the influence of its drive force, a snowmobile is moving
at a constant velocity along...
asked 4 hours ago -
Why do organizations decline? What steps can top
management take to halt, decline, and restore organizational...
asked 4 hours ago -
What mechanisms Drive speciation??
(I.e. what was Dawins theory on the orgin of species, and how...
asked 5 hours ago -
The manager at a car assembly plant believes that the mean
assembly time for a car...
asked 6 hours ago -
Which of the following is true of electron capture?
A) It decreases the nuclide's mass number...
asked 8 hours ago -
Assuming an efficiency of 43.10%, calculate the actual yield of
magnesium nitrate formed from 114.9 g...
asked 8 hours ago