![subject](/tpl/images/cats/fizika.png)
Physics, 19.11.2020 19:00 unknown6669
A student spots an unknown sample on a TLC plate. After developing in hexanes/ethyl acetate 50:50, he/she saw a single spot with an Rf of 0.55. Does this indicate that the unknown material is a pure compound? What can be done to verify the purity of the sample?
![ansver](/tpl/images/cats/User.png)
Answers: 3
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Physics
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 04:30
In a system, when potential energy decreases, then entropy also decreases. true false
Answers: 3
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 09:10
The air that we breath is made mostly of which gaseous molecule
Answers: 1
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 10:30
Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.
Answers: 3
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 13:00
Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.
Answers: 2
You know the right answer?
A student spots an unknown sample on a TLC plate. After developing in hexanes/ethyl acetate 50:50, h...
Questions
![question](/tpl/images/cats/mat.png)
Mathematics, 23.09.2019 11:00
![question](/tpl/images/cats/mat.png)
Mathematics, 23.09.2019 11:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/biologiya.png)
Biology, 23.09.2019 11:00
![question](/tpl/images/cats/es.png)
Spanish, 23.09.2019 11:00
![question](/tpl/images/cats/mat.png)
Mathematics, 23.09.2019 11:00
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/istoriya.png)
History, 23.09.2019 11:00
![question](/tpl/images/cats/mat.png)
Mathematics, 23.09.2019 11:00
![question](/tpl/images/cats/geografiya.png)
Geography, 23.09.2019 11:00
![question](/tpl/images/cats/biologiya.png)
Biology, 23.09.2019 11:00
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/health.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 23.09.2019 11:00
![question](/tpl/images/cats/mat.png)
Mathematics, 23.09.2019 11:00
![question](/tpl/images/cats/istoriya.png)
History, 23.09.2019 11:00