Recent content by firyace

I have been given this problem in my first week of classes in Physics: The McMath-Pierce Solar Telescope at Kitt Peak National Observatory in Arizona is a reflecting telescope (i.e., a concave mirror) of diameter 1.61 m and a focal length of 87.0 m. There is a screen in the focal plane of the...

Lets say you got a glass cube and a small light source embedded at the exact center of the glass cube. Now if you want to paint a circle on each face of the cube so that the light is prevented from leaving the cube, what is the minimum radius of the circle that you need to paint? Let say...

So then, do you count the excited state as one and de-exitications as another? Thanks

Thanks for the reply, I have checked my textbook, and it rarely talked about this spectrum (1page out of 1123 pages). And this question I got it from my practice final, from which the answer said it was six. Yeah, i was thinking about that too, and then it should be three then, right...

A sample of hydrogen gas absorbed sufficient energy to make the electrons jump to the 3rd excited energy level. It is said that 6 lines can be observed in the complete emmission spectrum as the atoms relax back to ground state. But why six though? When I check a diagrm of the spectrum, it...

I have given this problem: The reaction: A--> Products Follows the Rate Law, Rate = k[A]^2. When the initial concentration of A is 2.00M, it takes 1 hour for 60% of A to react at 25 celsius. What is the value of the rate constant k at this temp? -I try to sub 2.00 into A, and (2.00 *...

So now I am confused, do I just neglect the HCl totally because that the concentration is neglegible? :bugeye: that is what it said for the question.

Hi, I got a problem with something regarding to chemistry. How can you determine the pH of a solution with two Acids? The question says that A 50.00 mL aqueous solution is made by mixing the following two solutions: 10.00mL 1x10^-9M HCl 50.00mL 1*10^-4 M CH3COOH (Ka= 1.8*10^-5) a)...