![subject](/tpl/images/cats/himiya.png)
Chemistry, 18.07.2019 14:00 jetblackcap
Arock sample contains 4.5g of potassium-40 and 31.5g of its daughter isotope (argon-40). how old is the rock sample if potassium-40 has a half-life of 1.3 billion years?
![ansver](/tpl/images/cats/User.png)
Answers: 2
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Chemistry
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 02:00
For each of the following types of reactions, write a general reaction formula in the symbolic form—for example, a + b → ab. single-displacement double-displacement synthesis decomposition
Answers: 1
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 07:30
Free answer. the treaty of versailles ended world war i, but some of the terms of the treaty contributed to the beginning of world war ii. which was one of the terms of the treaty? the answer would be "germany was forces to pay reparations to the allied countries.". i hope this .
Answers: 1
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 18:30
Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years
Answers: 2
![question](/tpl/images/cats/himiya.png)
Chemistry, 23.06.2019 00:30
When a beta particle is emitted, the mass number of the nucleus a. decreases by one b. increases by one c. remains the same d. decreases by two
Answers: 2
You know the right answer?
Arock sample contains 4.5g of potassium-40 and 31.5g of its daughter isotope (argon-40). how old is...
Questions
![question](/tpl/images/cats/en.png)
English, 05.11.2020 22:40
![question](/tpl/images/cats/obshestvoznanie.png)
![question](/tpl/images/cats/biologiya.png)
Biology, 05.11.2020 22:40
![question](/tpl/images/cats/mat.png)
Mathematics, 05.11.2020 22:40
![question](/tpl/images/cats/health.png)
Health, 05.11.2020 22:40
![question](/tpl/images/cats/en.png)
English, 05.11.2020 22:40
![question](/tpl/images/cats/fizika.png)
Physics, 05.11.2020 22:40
![question](/tpl/images/cats/mat.png)
Mathematics, 05.11.2020 22:40
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/en.png)
English, 05.11.2020 22:40
![question](/tpl/images/cats/istoriya.png)
History, 05.11.2020 22:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/pravo.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 05.11.2020 22:40
![question](/tpl/images/cats/mat.png)
Mathematics, 05.11.2020 22:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/istoriya.png)
History, 05.11.2020 22:40
![question](/tpl/images/cats/geografiya.png)
Geography, 05.11.2020 22:40