Recent content by VanessaN

Buffers are compounds that resist changes in pH. Buffering capacity= Moles of acid or base added in buffers solution / change in solution's pH. The greater the buffering capacity, the greater the quantity of acid or base which must be incorporated with a material to alter the pH. I would think...

Homework Statement Which of the following atoms has the largest first ionization energy? Potassium, Zinc, Gallium, or Krypton? Homework Equations No equation The Attempt at a Solution Krypton has the largest first ionization energy, but I was wondering how this question would be...

Energy levels of an electron... I was just copying down the question :)

Thank you. maybe this equation: Energy of electron transition= -Rh ( 1/ ni^2 - 1/ nf^2) where ni and nf are the intial and final principal quantum numbers3.01 * 10^-9= -(2.18 * 10^-18) * (1/ ni^2 - 1/ nf^2) 3.01 * 10^-9= -(2.18 * 10^-18) * (1/ 3^2 - 1/ nf^2) 3.01 * 10^-9= -(2.18 * 10^-18) *...

E= - Rh/ n^2, where E is the energy of the electron and Rh is the Rydberg constant (2.18 * 10^-18) 3.01 * 10^-9= -(2.18 * 10^-18)/ n^2 n^2= 7.24 * 10^-10 n= 2.69 * 10^-5 I don't really know of other equations to use :(

Homework Statement Between which energy levels are the photons in this line transitioning? Wavelength= 660 * 10^-9 m Change in energy = 3.01 * 10^-9 A. 4 and 2 B. 3 and 2 C. 3 and 1 D. 2 and 1 Homework Equations...

ahhh, the case where i make a problem much more difficult by not understanding the question... the word "center" should have tipped me off to the fact that the final height would be 0.5! Thank you for your help i appreciate it!

Homework Statement A water storage tank is open to air on the top and has a height of 1 m. If the tank is completely full and a hole is made at the center of the wall of the tank, how fast will water exit the tank? Homework Equations Pressure is the same as atmospheric pressure because the...

Thanks!

Homework Statement Val-tRNA val is the tRNA that carries valine to the ribosome during translation. Which of the following sequences gives an appropriate anticodon for this tRNA? A. CAU B. AUC C. UAC D. GUG Homework Equations There are four different codons for Valine: GUU, GUC, GUA, and...

Thank you! I got the first question, but for the second question, I'm not sure if I'm using the correct method to get the answer.. 1/2* m * (1.3v)^2 - 1/2* m * v^2 = (supposed to equal) 0.69 * 1/2 * m * v^2, but how do I get that... 1/2* m * 1.69* v^2 - 1/2* m* v^2 = 0.845* m*v^2 - 0.5 * m*...

I actually have 2 questions that I am getting stuck on around the same point.. Question 1) An arrow with a mass of 80g is fired at an angle of 30 degrees to the horizontal. It strikes a target located 5 m above the firing point and impacts the target traveling at a speed of 20 meters/sec. If...