What kind of reaction is ca + 2hci + h2?

What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container?

Why are the trends and exceptions to the trends in ionization energy observed?

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d