Which formula should be used to calculate pressure and temperature changes if the volume remains constant

a
p1t1=p2t2

b
v1t1=v2t2

c
p1v1t1=p2v2t2

d
p1v1=p2v2

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

If i had 2 m naoh solution, what does the 2 m stand for? 2 molar, but 2 of a solute in 1

Anitrogen atom and an oxygen atom combine chemically to form nitric oxide. what is nitric oxide?