1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
serious [3.7K]
3 years ago
14

One of the radioactive isotopes used in medical treatment or analysis is chromium-51. The half-life of chromium-51 is 28 days. H

ow much time is required for the activity of a sample of chromium-51 to fall to 12.5 percent of its original value
Chemistry
1 answer:
Goryan [66]3 years ago
7 0

Answer : The time required for decay is, 84 days.

Explanation :

Half-life of chromium-51 = 28 days

First we have to calculate the rate constant, we use the formula :

k=\frac{0.693}{t_{1/2}}

k=\frac{0.693}{28\text{ days}}

k=0.0248\text{ days}^{-1}

Now we have to calculate the time required for decay.

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant

t = time taken by sample = ?

a = let initial activity of the sample = 100

a - x = amount left after decay process  = 12.5

Now put all the given values in above equation, we get

t=\frac{2.303}{0.0248}\log\frac{100}{12.5}

t=83.9\text{ days}\approx 84\text{ days}

Therefore, the time required for decay is, 84 days.

You might be interested in
Le Châtelier's principle tells us that chemical _____ will adjust in an attempt to remove a stressor.
lawyer [7]
Le Châtelier's principle tells us that chemical <span>c. equilibrium </span>will adjust in an attempt to remove a stressor.
8 0
3 years ago
Will hydrogen ever make a double bond?
Andrei [34K]
No, hydrogen can only hold one bond and that's it.  It only needs to be paired with one bond.  
7 0
3 years ago
Read 2 more answers
Kinetic energy <br><br>definition:<br><br><br>sentence: ​
Irina18 [472]

Answer:

Kinetic energy , is the energy of an object possessed due to it's motion

Explanation:

Kinetic energy is the energy of mass in motion. The kinetic energy of an object is the energy it has because of its motion.

it's formula ½mv²

7 0
3 years ago
Explain what happens in a nuclear chain reaction
Vesnalui [34]

Answer:

Nuclear Chain Reactions. A chain reaction refers to a process in which neutrons released in fission produce an additional fission in at least one further nucleus. This nucleus in turn produces neutrons, and the process repeats. The process may be controlled (nuclear power) or uncontrolled (nuclear weapons).

Explanation:

7 0
3 years ago
Can someone please help me understand this?
Nataliya [291]

Answer:

French physicist Jacques Charles (1746-1823) studied the effect of temperature on the volume of a gas at constant pressure. Charles's Law states that the volume of a given mass of gas varies directly with the absolute temperature of the gas when pressure is kept constant. The absolute temperature is temperature measured with the Kelvin scale. The Kelvin scale must be used because zero on the Kelvin scale corresponds to a complete stop of molecular motion.

alt

Figure 11.5.1: As a container of confined gas is heated, its molecules increase in kinetic energy and push the movable piston outward, resulting in an increase in volume.

Mathematically, the direct relationship of Charles's Law can be represented by the following equation:

V

T

=k

As with Boyle's Law, k is constant only for a given gas sample. The table below shows temperature and volume data for a set amount of gas at a constant pressure. The third column is the constant for this particular data set and is always equal to the volume divided by the Kelvin temperature.

Explanation:

PLEASS MARK ME AS BRAINLIEST ANSWER

4 0
3 years ago
Other questions:
  • Why is the electronegativity of an element important?
    10·2 answers
  • Given one mole of each substance, which of the following will produce the FEWEST particles in aqueous solution? 1. sodium nitrat
    13·1 answer
  • A ball is launched from a spring on the floor with an initial velocity of 32 m/s. it then comes to a stop in 4.3 seconds. Determ
    12·1 answer
  • What happens to the average kinetic energy of gas particles as the temperature increases?
    13·1 answer
  • What is the oxidation state of each element in SO4(2–)?
    14·1 answer
  • Please please help me
    12·1 answer
  • Consider an ideal gas contained in a cylinder with the volume 34.4L, temperature 667K and pressure 2atm.What will be pressure of
    7·1 answer
  • Which macro nutrient is made up of carbon and hydrogen elements join together in long groups called hydrocarbons?
    13·2 answers
  • Where did Rutherford believe the protons were found?
    9·2 answers
  • Whats the answers for brainpop skeletal system
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!