Recent content by enigmatic

TY for your reply. I tried finding the time that way, but I ended up getting horribly negative numbers. I then tried finding delta t by equaling it to delta x/ v0cos(theta), where delta x = 36 and ended up getting t = 2.99s I used that in the delta y equation of delta y =...

Kicking a football 36m from the goal, which is 3.05m high. The ball leaves the ground with a speed of 20m/s at an angle of 53 degrees to the horizontal. By how much does the ball clear or fall short of clearing the crossbar? delta y = v0cos(theta)delta t The thing is, I don't know...

They don't say what the conjugate acid and base is, except that the base is RNH2, so then its conjugate acid would be RNH3, right? The base concentration would be .05/2 = .025 M. The reaction equation would be RNH2 + HCl <--> H2O + RNH3 Initial: .25M .1M...

Question: TRIS is a weak base. Compute pH of a solution containing .050 moles of TRIS and .020 moles of HCl in a total volume of 2L. pKb for TRIS is 5.92. Use RNH2 to represent TRIS. Equation: pH = pKa+ log ([conjugate base]/[acid]) Work: change equation for pOH: pH = 14-pOH pOH =...

Question: Which of the following would probably have a positive delta S value? He (g, 2atm) --> He (g, 10 atm) H2(g) + I2(s) --> 2HI (g) 2Ag(s) + Br2(l) --> 2AgBr(s) O2(g) --> O2(aq) 2NO2(g) --> N2O4(g) My answer: Well, I know that when a gas is pressurized, there are less states it...

thanks! (and thanks for the link, too!)

Thanks so much! So you balance everything except hydrogen and oxygen, balance oxygen by adding water to the other side, balance hydrogen by adding hydrogen ions to the other side, and balance charge by adding electrons on the side that needs it? Would you say that those would be the...

The question: Balance each of the following skeletal equations by using oxidation and reduction half reactions. All the reactions take place in acidic solution. Identify the oxidizing agent and reducing agent in each reaction. a) Cl2 (g) + S2O32-(aq) --> Cl-(aq)+SO42-(aq) My answer so...