12 more posts in this thread. [Missing image file: vanillin.png]
For those who've dealt with Vanillin + NaBH4 reaction:
So I've got the vanillin/ethanol and BH4/NaOH solutions mixed together, and will add HCl until it's acidic. Then I plan on ice bathing this to get a precipitate of the vanillyl alcohol.
Looking at some online procedures and a video, this is as far as they go, but one or two others take this precip and do a ethanol heating/evap process to it. So for those who have experience with this, is that really needed (or in other words, did you do that)?
26 more posts in this thread. [Missing image file: pythonlol.jpg]
Hey, /sci/, I'm in a basic programming class for python, and I'm having trouble understanding the in-class assignment that was given today. Could anyone help me out? The problem is as follows:
A prime number is a number that is only evenly divisible by itself and 1. For example, the
number 5 is prime because it can only be evenly divided by 1 and 5. The number 6, however, is not prime because it can be divided evenly by 1, 2, 3, and 6.
Write a Boolean function named is_prime which takes an integer as an argument and
returns True if the argument is a prime number, or False otherwise. Use the function in a program that prompts the user to enter a number and then displays a message indicating whether the number is prime.
We're working in python 3.2
23 more posts in this thread. [Missing image file: HorseCart1.gif]
Horse and wagon problem.
When the horse pushes of the ground with the force A, doesn't he also pull the cart/the cart pull him with the force A? I mean, they're attached to each other. Why can the horse pulls cart/cart pulls horse force be weaker than the horse pushes ground/ground pushes horse force?
They cannot be the same, if we assume the horse is able to pull the cart, since the net force would be zero, as then the horse WOULDN'T be able to move the cart.
They can't be different though, because then the cart would accelerate faster than the horse, if we assume they weigh the same, and it can't, since they're attached to each other. Where am I going wrong?
Math Genius Please
7 more posts in this thread. [Missing image file: saviour.png]
I posted this on /b/ and realized this place exists about two seconds later...
I need a math genius, one of my grandparents just died. I know how much each grandchild got, and how much each great grandchild got.
Parents won't tell me how much their portion is. I feel like it's on the tip of my calculator, but I just am not smart enough to finish this.
Give me a guess based on these numbers. Please?
There were 11 great grandkids and each got $5,000
There were 9 grandchildren and each got $27,500
What did the 4 children get?
Come on tell me what my mom is hiding.
is it just me, or is this guy so, so wrong about everything?
2 more posts in this thread. [Missing image file: yada.jpg]
"dogma number something, scientists believe matter is unconscious." His conclusion, humans, animals, trees, etc must also be unconscious..
think i laughed my way through all but 3 of his 10 "dogmas every educated person [apparently] believe."
1 more posts in this thread. [Missing image file: Captura.png]
How fucked is my brain?
I been smoking cannabis for twelve years every day, It hasn't impeded me to become an electronics engineer. During my college time I haven't smoked probably in two or three days. I could smoke 500 g of cannabis per month.
I also started to study chemical engineering but I didn't finish it. Then I started to study master's degree in energy but this time I didn't only smoked I started to drink alcohol every day and started to take a cocktel of antidepressants and benzodiazepines because I tried to kill myself by carbon monoxide poisoning then because my girlfriend left me for my best friend. I suffered pulmonary thromboembolism ( I took every day 300 mg of bupropion, 150 mg of venlafaxine, 1 mg of alprazolam, 50 mg of Dipotassium chlorazepate, 5 mg of diazepam, 100 mg of trazodone hydrochloride and 10 mg of olanzapine ).
Nowadays I take more or less a half of drugs and I almost no drink and smoke cannabis. I sleep for twenty hours and I awake for twelve hours but I'm still lerning I read the Cohen Tannoudji book's and I am also programming AVR microcontrollers, Java and Phyton.
I hope to die soon because I owe the bank $ 40,000 for my education and I dont have a job.
How is my brain?