Help pls very simple

How will the emission of an alpha particle affect the atomic number of an atom

What are transitions between a liquid and a solid called? identify which way they are transitioning

Which buffer would be better able to hold a steady ph on the addition of strong acid, buffer 1 or buffer 2? explain. buffer 1: a solution containing 0.10 m nh4cl and 1 m nh3. buffer 2: a solution containing 1 m nh4cl and 0.10 m nh3