# Search results

1. ### Is this the same organic side chain?

Attached is the image of the desired structure, my question is based on what is pictured as (CH3)2HC- I represented this group as C3H7 which does seem like the logical equivalent, but just being safe here. Am I right? Thank you!
2. ### Acids and Bases calculation problems

Homework Statement Data for Question B: (initial)[CH3COOH] = 0.500 mol dm–3 and) eqm [CH3COOH] = 0.200 mol dm–3; (initial)[CH3COO–] = 0.300 mol dm–3 and) eqm [CH3COO–] = 0.300 mol dm–3; The Attempt at a Solution Question A) " FInd the pH of a mixture of 50.0 cm3 of 0.100 mol...
3. ### Does Le chatlier's law apply if reactants are liquids and a product is solid?

Hi So the reaction is below: Sodium thiosulfate + HCl = Sulfur + NaCl+ Water+ SO2 So if I wanted to say 'Increasing the conc. of Sodium thiosulfate has shifted the equilibrium to the left (reactants) and thus the system works to break down excess reactants and create more product by...
4. ### How to determine zinc in a plant.

Which would you prefer? I'm calculating the amount of zinc absorbed by a particular plant (yes, in theory it does accumulate zinc- B.Juncea).
5. ### Caculating the enthalpy change of reaction from delta T values(experimentally)

Hi! Thanks for your interest in this this post :D! So two reactions I performed were: A) Adding 50 cm3 water to 0.025 moles CuS04 and measuring ΔT. B) Adding 50 cm3 water to 0.025 moles CuS04.5H2O and measuring ΔT. Well turns out the calculations were wrong, since I apparently didn't get...
6. ### Do Hess's Law equations have to be balanced

1. Research Question: How effectively can experimental values estimate the heat of hydration of Copper (II) Sulfate as compared to theoretical values found using Hess’s law? 2. 3. In the image above I have ΔH20 and ΔHreaction(not labelled) and intend to experimentally find out ΔH...
7. ### Why does all the excess BE go to the radiated particle?

Well all textbooks probably state something like this 'A Nucleus loses energy by radiation' I'm cool with that statement except the fact that all the excess BE or energy is lost only to the eg.alpha particle! and no mention of some being given to the new nucleus! Look at this for example: Mass...
8. ### Why does decay increase Binding energy ?

Can someone explain this excerpt from my textbook please? "IF nucleus A was made from its constituents (Binding energy) and it released 400MeV, but making nucleus B(product) releases 405MeV. Therefore if A changes to B, 5 MeV of energy must be released. This excess energy is given to the...
9. ### Nuclear Physics sum query

(NOT HOMEWORK)Hey guys the question in the text book goes like this: Q) It is found that alpha particles with a KE of 7.7MeV bounce back off an aluminium target. If the charge of an aluminium nucleus is +2.1*10^-18C, calculate the velocity of the alpha particles(mass 6.7*10^-27kg)...
10. ### What is Q in kQq/r ?

What is Q in kQq/r ?? Hey guys the textbook says Q is (+Ze) and q is (+2e) the later is 2 times the positive equivalent of an electron's charge. Though the former I'm unable to make any sense of, what is Ze?? Thanks Cheers!!
11. ### What is 'K' in K=1/4pi Epsilon 0?

Hey So for those that don't know, I'm reading this from Atomic Physics, basically where they teach you how the size of a nucleus was determined by shooting alpha particles at it. due to repulsion an alpha particle can get only 'so-close' to nucleus(they're both positively charged), and the the...
12. ### Circuit sum query

On the attached image of a circuit I was given a sum in the exam as follows, but I can't make sense of it: The circuit has an EMF of 12V and an internal resistance of 5ohms. Q1) Total resistance of the circuit A) 50(45+5) I don't get why they add 5 since that's the internal resistance...