Recent content by freedom856

can you give some example to me for what you said? thank you

i want to ask why repulsion will cause energy increase and attraction will causes energy decrease, Do you understand?

Does anyone tell me why the potential energy increase(becomes more positive) when two atom put closer to each other which is smaller than the equilibrium bond distance while potential energy decrease(becomes more negative) when two atoms put closer to each other (which is close to equilibrium...

your answer is correct if i run TLC once and i can find the answer, but the problem is i only sit in the classroom and answer this question. How can i run TLC to determine their polarity? i really request a way to solve this kind of problem.

Sorry.It is not TLC. It is HPLC. i do remember the question does not state what solvent is used

i was wondering the polarity of ethyl acetate and nitrobutane, which one is more polar? As i face this question in test(liquid chromatography using normal phase and reverse phase) Asking for the elution order, i am not sure which one is more polar? Can anyone answer my question? Also, if i...

what about average error?

o i see. i wonder whether different volume of sample may or may not affect number of moles. Thank you. Is mass of solvent = 9.58-0.0727 = 9.5073g?

Is (0.0206x28.9/1000)x122.12 = 0.0727g ?

number of moles of acid react

In an experiment, 7g benzoic acid is dissolving to 350ml distillated water in 500ml conical flask at 60C for a period of time. 100ml of solution is then withdrawn and place at 40C water bath. After several minutes, 10ml sample is withdrawn and the weight of sample is 9.58g. The solution is then...