Explanation:
Initial mass of the isotope 90-Sr in baby= 1.00 μg
Formula used :
where,
= initial mass of isotope
N = mass of the parent isotope left after the time, (t)
= half life of the isotope = 28.1 years
= rate constant
a) Time taken by the sample, t = 18 years
0.6415 μg will remain after 18 years.
b) Time taken by the sample, t = 70 years
0.1779 μg will remain after 70 years.
Answer:
14,138.985
Explanation:
I think!
multiply the amount of atoms in copper by the amount of grams. hope this helped
Answer:
The enthalpy of reaction for the reaction of chlorine with ozone is -162.5 kJ.
Explanation:
..[1]
..[2]
..[3]
The enthalpy of reaction for the reaction of chlorine with ozone can be calculated by using Hess's law:
[2] - [1] = [3]
The enthalpy of reaction for the reaction of chlorine with ozone is -162.5 kJ.
Answer:
Option (C) 3
Explanation:
The pH scale is a scale that ranges from 0 to 14. The pH reading has various notifications. These notifications are as follow:
1. If the pH reads between 0 and 6, then the solution is acidic.
2. If the pH reads 7, then the solution is neutral.
3. If the pH reads between 8 and 14, then the solution is basic.
With the above information, option C is the correct answer to the question.
Answer:
All elements are neutral
Explanation:
The plum pudding model of the atom indicated that all elements are neutral. The model was proposed by J.J Thomson after he conducted his experiment on the gas discharge tube.
From the experiment he discovered electrons which he called cathode rays.
Therefore, he suggested the plum pudding model of the atom.
The model describes negatively charge sphere surrounded by positive charges to balance them.
