Most popular questions and responses by Cad
1. Chemistry

What is the empirical formula of caffeine (C8 H10 N4 O2)? How do I get it? Thanks

2. Calculus

Find the equation of a quartic polynomial whose graph is symmetric about the y-axis and has local maxima at (−1,1) and (1,1) and a y-intercept of -1.

3. Biology

These are true and false questions and I want to be sure of my answers. Please someone check. Thanks: The eight-element periodicity found in the Periodic Table is related to the number of electrons in the outermost energy level of the atoms that make up

4. Biology

1. A medical scientist is designing an experiment to test the results of a new drug that she hypothesizes will greatly reduce and possibly eliminate the side effects of a new cancer treatment. If this experiment is to be set up correctly, she must (A)

5. Calculus

Can someone please tell me how to find the following integral? cos^4(2q)*sin(2q) dq

6. Biology

These are true and false questions and I want to be sure of my answers. Please someone check. Thanks: The eight-element periodicity found in the Periodic Table is related to the number of electrons in the outermost energy level of the atoms that make up

7. Calculus

Find the equation of a circle with center C(1,6) and tangent line x-y-1=0.

8. Chemistry

What is the energy of a 425 nm photon? a) 2.82 x 10^-40 J b) 1.6 x 10^-27 J c) 4.67 x 10^-19 J d) 4.67 x 10^-28 J I don't get any of these answers. =S Please help...

9. Chemistry

What is the energy of a 425 nm photon? a) 2.82 x 10^-40 J b) 1.6 x 10^-27 J c) 4.67 x 10^-19 J d) 4.67 x 10^-28 J I don't get any of these answers. =S Please help...

10. Derivatives

Find the derivative of g(t)=8t^2+9t at t=1 algebraically... g'(1)= _________

1. Biology

Sorry didn't notice, now I saw it.

posted on September 3, 2011
2. Biology

Thanks.

posted on August 31, 2011
3. Chemistry

Oh, I made some mistake with the values... now I got 4.67x10^-19 well actually 4.68x10^-19 but that's not in the options... is this answer right?

posted on March 26, 2011