Which solution when mixed with a drop of bromthymol blue will cause the indicator to change from blue to yellow
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bromothymol blue in aqueous solution gives a yellow color.
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The correct answer is 9.6h.
As you know, a radioactive isotope's nuclear half-life tells you exactly how much time must pass in order for an initial sample of this isotope to be halved.
Using the formula , A = Ao.
where , A- final mass after decay
Ao - initial mass
n - the number of half-lives that pass in the given period of time
Now, putting all the values, we get
1.3 × mg = 0.050 mg ×
Take the natural log of both sides of the equation to get,
㏑ = ㏑
㏑ = n. ln
n = 1.6
Since n represents the number of half-lives that pass in a given period of time, you can say that
t= 1.6 × 6 h
t = 9.6h
Hence, it will take 9.6 h until the radioactive isotope decays.
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Final answer:
Using the formula for radioactive decay and the provided half-life of technetium-99m, it can be calculated that it takes approximately 28.5 hours for 0.050 mg of technetium-99m to decay to a quantity of 1.3 x 10^-2 mg.
Explanation:
The decay of a radioactive isotope is an exponential process based on the half-life, which is, in turn, constant for any given isotope. The general formula for the remaining quantity of a radioactive isotope after a given time is given by: N = N0 (0.5) ^(t/t1/2), where (N0) is the initial amount, (N) is the remaining amount, (t) is time, and (t1/2) is the half-life of the isotope. In this case, we are given the initial quantity (N0 = 0.050 mg), the remaining quantity (N = 1.3 x 10^-2 mg), and the half-life (t1/2 = 6.0 hours).
We can solve for time (t) in the equation: N = N0 (0.5) ^(t/t1/2). Plugging in the values, we get 1.3 x 10^-2 = 0.050 x (0.5)^(t/6), and solving for t, we find that it takes approximately 28.5 hours for the technetium-99m to decay to 1.3 x 10^-2 mg.
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The location of earth in the solar system is found between Venus and Mars.
What is a solar system?
A solar system is the gravitational bound system comprising the sun and the objects aligned in the orbit revolving around the sun. The foundation of the solar system is mediated billions of years ago with the huge interstellar cloud collapse.
The planets are present in the orbit bounded by the gravitational force of the sun and revolve around it. Earth is the planet that is said to have only one having the five elements that support life namely. fire, air, water, soil, and space.
The solar system is comprised of 9 planets with the nearest to the sun being mercury, and the farthest being Pluto. Earth is arranged as the third planet from the distance from the sun and is located between Venus and Mars.
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Cu + 2AgNO3 = 2Ag + Cu(NO3)2
We are givent the amount of silver to be produced. This will be the starting point. Calculations are as follows:
3.50 mol Ag ( 1 mol Cu / 2 mol Ag ) = 1.75 mol Cu
Therefore, we need 1.75 mol of copper in order to produce 3.50 mol of silver.
Answer:
1.75 moles of copper must react to form 3.50 mol of Ag.
Explanation:
According to reaction 2 moles of silver are obtained from 1 mole of copper.
Then 3.50 mole of Silver will be obtained from:
1.75 moles of copper must react to form 3.50 mol of Ag.
(2) the atmospheric pressure decreases
(3) there is a catalyst present
(4) there are effective collisions between the particles
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Justification:
The collision theory explains the chemical reactions in terms of collisions. A chemical reaction takes place if two molecules collide effectively.
So, the first conditon is that the collision occur.
The second condition, that the collision be effective requires two conditions:
1) that the collision occurs with the proper orientation of the molecules, and
2) that the energy of collision be high enough to start the break of the original bonds ant the creation of the new bonds in the activated complex.
The energy required to form this activated complex is the activation energy.
So, an effective collision requires the proper orientation of the molecules when they collide and that the energy be equal or greater than the activation energy.
Temperature and catalyst are factors that affect the occurrence of those collisions, so they affect the rate of the reaction, by modifiying the number of collisions.