When the concentration of hydrogen lons equals the concentration of hydroxide ions, is called the ?

Agas in a balloon at constant pressure has a volume of 160 ml at -125*c. what is its volume at 29.0*c?

Describe the particles of all three phases of matter in the root beer float. (how are the particles arranged and moving? )

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?