What is the pOH for a solution that has a hydroxide ion (OH-) concentration of 4.78x10^-2 M? What is the pH?

The diagram below shows the movement of particles. what does this piece of evidence best support? the collision theory the maxwell-boltzmann distribution the effect of pressure on reaction rates the effect of temperature on reaction rates

If a simple machine aduces the strength of a force, what must be increased? the speed of the input force the work the simple machine performs the size of the simple machine the distance over which the force is applied

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?