A ball is thrown upward as shown. Gravity pulls (accelerates) the ball back down. Which of the following statements is true? Velocity and acceleration are both positive.

Velocity is negative and acceleration is positive.

Velocity is positive and acceleration is negative.

Velocity and acceleration are both negative.

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!