# helpp

Most popular questions and responses by helpp
1. ## CHEMISTRY

for the reaction system H2 + X2 2HX Kc = 24.4 at 300 K a system made up fron these components which is at equilibrium contains 0.150 moles of H2 and 0.600 moles of HX in a 3.00 liter. calculate the number of moles of X2 present at equilibrium.

2. ## chemistry

In a laboratory experiment, the density of a concentrated sugar solution was determined by measuring the volume of the solution and corresponding mass. Three students each made a set of measurements using a different balance and used the results to

3. ## Chemistry

At 60 celsius the value of Kw is 9.5x10^-14. considering this waht is the calculated value for the pOH of a 2.00x10^-3 M HCL solution at this temperature? the answer is 10.32 i do the -log and i get 11.31 please advice

4. ## Physics

A student ties a 600.0 g rock to a 1.50 m-long string and swings it around her head in a horizontal circle. At what angular speed (in rev/min) does the string tilt down at a 13.1° angle, assuming that the local acceleration due to gravity is -9.80 m/s2?

5. ## CHEMISTRY

If the OH ion concentration in an aqueous solution at 25 celsius is 3.4x10^-3 M the the H concentration in moles per liter in the same solution is? answers is 2.9x10^-12 i do the -log and i get 2.46 i don't know that else

6. ## Physics

A 6.80 g coin is placed 10.0 cm from the center of a turntable. The coin has a coefficient of static friction of 0.80 and a coefficient of kinetic friction of 0.60 with the turntable. The turntable's angular velocity slowly speeds up until the coin starts

7. ## Physics

A motorcycle with a mass of 350 kg is accelerated from rest to a velocity of 30 m/s by a force of 4000 N. calculate the distance over which this acceleration occurred.

8. ## Chemistry

Given the table of pKa values, at a pH of 3.5, which substance(s) exist predominantly in the non-protonated form? Acid pKa HNO3 -1.3 HSCN 4.0 HCN 9.4 HOCI 7.4

9. ## english

Is being overly skinny, not eating regularly or cosmetic surgery really appealing? Well, we're in a society where celebrities have taken over individuals' lives. That we as individuals don't have much pride in ourselves anymore . We have to put in our mind

10. ## physics

Vector C has a magnitude 25.8 m and is in the direction of the negative y axis. Vectors A and B are at angles α = 41.9° and β = 27.2° up from the x axis respectively. If the vector sum A B C = 0, what are the magnitudes of A and B?

11. ## physics

Vector C has a magnitude 25.8 m and is in the direction of the negative y axis. Vectors A and B are at angles α = 41.9° and β = 27.2° up from the x axis respectively. If the vector sum A B C = 0, what are the magnitudes of A and B?

12. ## SCIENCE

what bicycle parts help the downhill race bike and road race bike and why are they different from normal bikes?

13. ## english 3

11. Which one of the following statements is not true about the president Ratcliffe portrayed in The General History? He wasn't very popular. His judgment was weak in times of peril. He voluntarily turned over leadership to John Smith. He was greedy and

15. ## Ap calculus

Find the equation of the tangent line to the curve g(X)= 2cos(2X)/(3X) at the point x= pi/3

1. ## ss

I did that and it landed me here.

posted on December 6, 2018
2. ## english

yh

posted on February 2, 2016
3. ## english

no im doing revision at home

posted on February 2, 2016
4. ## english

huh? why is it wrong

posted on February 2, 2016
5. ## english 3

I wanted to check my answers but I guess not. Thanks anyways.

posted on February 24, 2012
6. ## CHEMISTRY

ok thanks

posted on October 26, 2011
7. ## CHEMISTRY

so i do the -log(3.4x10^-3)=2.46

posted on October 26, 2011
8. ## Chemistry

ok thank you

posted on October 26, 2011
9. ## Physics

It says it was incorrect even after I converted to rev/min

posted on October 17, 2011