Assuming no volume change, calculate the pH of: a. a solution made from 0.0500 mol of NaOH(s) added to 1.00 L of pure water. b. a solution made from 0.0500 mol of NaOH(s) added to 1.00 L of a buffer containing 0.100 mol each of weak acid (pK, = 5.00) and its conjugate base.

Plz mark brainliest 30 points1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s.2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

The identities of substances are the same before and after which type of change