# aommaster

Senior Members

1457

1. ## Solubility

Are you sure that there was a name for this apparatus? From what the lab technician seems to tell me, there doesn't seem to be a name for it
2. ## Laser diffraction through a single slit

Swansont: Yeah, I realised that when we did the laser diffraction. So let me see if I got this right: When single slit diffraction occurs, the wave passes through the slit, and the slit behaves as it is the light source. And this, in turn, causes the diffraction pattern seen as there is a difference in distance travelled As for the double slit diffraction, the particle goes through BOTH of the gaps (by some means we are not sure of) and causes the normal double slit diffraction. Is the part that I have emphasised above correct? Are we not sure why particles travel through both slits?
3. ## Solubility

Wow! Thanks alot for that guys! Ryan: I asked my lab technician about it, but she says that they just call it the freezing point aparatus. My chemistry teacher said the same thing, they had no special name for it
4. ## Laser diffraction through a single slit

But how can it? If you fire a single particle through two slits, I was told that the particle goes through BOTH slits. How come? Is this where the idea of extra dimensions come from? And is this the wave-particle duality principle that Klaynos is talking about, or am i completely off track?
5. ## The second order derivative

oh dear! An example would really help, because I want to try it out for myself. I have a program called omnigraph and I could plot the graph, calculate the derivative and see what my answer leads me to.
6. ## Laser diffraction through a single slit

Hi guys! The diffraction pattern of a double slit when a laser is passed is easily explained my superposition (interference). How do you explain the very distinct sections of light when a laser is passed through a single slit? Surely it can't interfere with itself? Also, if it is a possibility, scientists fired single electrons through a slit, one after the other, with a time gap in between, removing any chance that they may interfere with themselves, but still, the same pattern was produced. Why does that happen? I think this has to do with quantum physics, and at the moment, I am fairly new to it, so, please try and use simple language, for my brain cannot handle extreme physics Thanks alot guys!
7. ## The second order derivative

Hi guys! In calculus, we were shown ways of finding maximums and minimums. To do this, we had to differentiate, and then make the differential=0. Then, to make sure whether is was a maximum or minimum, we double differentiated the original equation (or simply differentiate the differential). If the value was positive, the point was a local minimum, and vice versa. The book had stated that if the double differential was equal to 0, then, it was a point of inflexion. However, my teacher stated that this does not apply on some curves, and therefore, not to use it, but find the gradient before and after the point, and decide thereon. Could some of you guys please give me an example of such an occurrance? Thanks alot guys!
8. ## Why Calculus?

I'll explain very briefly... calculus can be used in many real life situations. For example, if you have a function which is your profit that is in the shape of the curve, and you want to maximise it, you would need to use calculus to help you find the value. Also, it can be used for find minimums of curves. When used correctly, calculus can be one of the most powerful tools of a mathematician. However, calculus can be used for a lot more than what I have stated. The other guys here, who have more knowledge than me would be able to help you. This is just what calculus means to me
9. ## Awesome chemistry question - you try it out yourself

Yeah, 1000mL is 1000cm^3 So basically, 1000mL=1000cm^3=1 litre Basically speaking, they are three different ways of speaking about the same thing! Thats science for you
10. ## Solubility

No problem, they looked like what you were describing. Anyway, I'll ask the lab technician about it We'll see who gets the answer first
11. ## Awesome chemistry question - you try it out yourself

Well, yes. A decimeter cubed is (10cm)^3 and therefore 1000cm^3, which is a litre!
12. ## Solubility

I did a quick search in google, is this what you are talking about? http://humboldt.edu/~scimus/Instruments/Therm-Edser/BckmnFPapp.htm http://www.koehlerinstrument.com/products/K29750.html
13. ## Awesome chemistry question - you try it out yourself

It stands for Dm^3 ie Decimeter Cubed
14. ## Solubility

Don't worry, I'll ask my lab technician. She'll probably know what it is
15. ## Solubility

Thanks alot for that Ryan!
16. ## Solubility

Thanks alot for clearing that up woelen! Ryan:I guess to test this, I'll need to use a freezer, since I'm not sure whether my school will allow me to get my hands on ammonium nitrate Thanks alot for your help guys!
17. ## Solubility

No problem! Thanks alot for that! Would sugar and salt work out as a good experiment? And how should I measure the freezing point? Would sticking it into a freezer with a thermometer work? Thanks alot for your time Ryan!
18. ## Solubility

So basically, if the solution is saturated, it would that the lowest possible solubility?
19. ## Solubility

Hi guys! Consider the following situation: You have 5 beakers with different salt concentration solutions: Beaker 1: 0% Beaker 2: 5% Beaker 3: 10% Beaker 4: 15% Beaker 5: 20% Which one would have the lowest freezing point? My guess would be the 20% one. Also, is there a limit to how low the freezing point can go? Does that limit mean that no matter how much of the solute you add, the freezing point won't reduce any further? Thanks alot guys!
20. ## Just a quick temperature question!

What you said is exactly correct. And therefore, you can work out the average molecular speed of a gas by using the following formula: $\tfrac{1}{2} <c>^2=\tfrac{3}{2} kT$ Where: <c^2> is the mean square speed k is Boltzmann's constant T is the temperature of the gas And from that you can see that average speed of the particles is proportional to the tempereature, which you stated earlier! Haha! My first Latex equation!
21. ## Hard probability concept

The reason for this is that you are looking for the probability: The ball is not a red and not "the ball is green" Then, you draw another ball agaiin after replacement and say "The ball is not blue". Again, you are not alooking for a green ball. I hope this helps!
22. ## Just a quick temperature question!

...and as a result of that, a Boltzmann curve is produced, right?

24. ## measuring entropy of a single substance

Hi guys, Just wondering is there a way of actually measuring the entropy value (S) of a single substance, without reacting it with something and measuring the change in entropy? P.S. My Chem teacher didn't know!!! Thanks
25. ## The master set of equations

Thanks alot for that guys! By the way, you know the PBS.org website you gave me? We watched the whole set of Elegant Universe videos at school, which was pretty cool!
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