Answer:
Number of moles = No of mokecules/ Avigadro's number
Avigadro's number = 6.022*10(23)
No of moles = 1.505*10(24)/6.022*10(23)
No of moles =2.49 = 2.5mol
The number of mole is 2.5mol
If a liquid is heated it’s particles are given more energy and will move faster, however if it is cooled, it’s particles slow down and come closer together.
The idea that synthetic items are bad can be correct but not in all situations. Synthetic items have been made to make life easier.
I think its C not 100% sure tho
Answer:
The open system evaporates the solvent in the solution
Explanation:
An open system is a system in which exchange of materials and energy can occur. If a TLC set up is left open, then the set up constitutes an open system.
During TLC, the sample is dotted on the plate and inserted into a suitable solvent. The solvent moves up the plate and achieves the required separation of the mixture.
Most of these solvents used used TLC are volatile organic compounds. Therefore, if the TLC set up is left open, the solvent will evaporate leading to poor results after running the TLC experiment.