A baseball is thrown with a kinetic energy of 2.2 J. Since it is above the ground, it also has a potential energy of 1 J. What is the baseball's mechanical energy? Show all work. P. S please do not just answer for the points so many people do that...

Check the correct box to describe the periodic trends in electronegativity. electronegativity across a period: decreases. increases. electronegativity down a group: decreases. increases.

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .

When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?