b. 25.0 g/mol
c. 47.5 g/mol
d. 56.0 g/mol
e. 125 g/mol
Answer :
The parent and daughter concentrations (in percentages) is, 60 % and 40 % respectively.
The age of rock is
Explanation :
First we have to calculate the parent and daughter concentrations (in percentages).
and,
As we know that, the half-life of uranium-238 = years
Now we have to calculate the rate constant, we use the formula :
Now we have to calculate the time passed.
Expression for rate law for first order kinetics is given by:
where,
k = rate constant =
t = time passed by the sample = ?
a = initial amount of the reactant = 3 g
a - x = amount left after decay process = 1.8 g
Now put all the given values in above equation, we get
Therefore, the age of rock is
A) markings on the gun's exterior
B) markings on the casing
C) markings on the bullet
D) powder residues
One that is can associate a suspect and the firing of a gun is powder residues. The correct option is D.
GSR is made up of unburned or partially burned gunpowder particles, soot, nitrates, and nitrites from powder combustion, primer particles (oxides of lead, antimony, and barium), and bullet or bullet jacket particles that are vaporized when a firearm is discharged.
Gunshotresidue (GSR) is a speck of vital trace evidence that assists forensic scientists in solving a wide range of firearm-related incidents.
The identification of the shooter, as well as bullet identification from a gunshot wound, aid in the reconstruction of a crime scene.
Powderresidues are one thing that can link a suspect to a gunshot.
Thus, the correct option is D.
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Explain how each item is used in the procedure
List any safety equipment needed and how it is used in the procedure
Describe how this procedure might be used in a situation outside the chemistry classroom