![subject](/tpl/images/cats/himiya.png)
Uranium-235 (u-235) radioactively decays into lead-207 (pb-207). i'm measuring the number of atoms in a mineral, and i find that there are 500 atoms of u-235 and 1500 atoms of pb-207. if we assume the mineral contained only parent and no daughter, then how many atoms of these elements were in the mineral when the rock first formed?
![ansver](/tpl/images/cats/User.png)
Answers: 2
Another question on Chemistry
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 22:30
Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt
Answers: 1
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/himiya.png)
Chemistry, 23.06.2019 04:31
What is the amount of energy for a photon that has a 125 cm wavelength
Answers: 2
You know the right answer?
Uranium-235 (u-235) radioactively decays into lead-207 (pb-207). i'm measuring the number of atoms i...
Questions
![question](/tpl/images/cats/mat.png)
Mathematics, 16.10.2020 16:01
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 16.10.2020 16:01
![question](/tpl/images/cats/mkx.png)
Arts, 16.10.2020 16:01
![question](/tpl/images/cats/mat.png)
Mathematics, 16.10.2020 16:01
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/istoriya.png)
History, 16.10.2020 16:01
![question](/tpl/images/cats/mat.png)
Mathematics, 16.10.2020 16:01
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 16.10.2020 16:01
![question](/tpl/images/cats/mat.png)
Mathematics, 16.10.2020 16:01
![question](/tpl/images/cats/mat.png)
Mathematics, 16.10.2020 16:01