Which equilibrium represents a buffer equilibrium? A.
HI + H2O ⇔ H3O+ + I-
B.
HCN + H2O ⇔ H3O+ + CN-
C.
NaOH ⇔ OH- + Na+
D.
HCl + H2O ⇔ H3O+ + Cl-
E.
HClO4 + H2O ⇔ H3O+ + ClO4-

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

When determining the shape of a molecule, it is important to draw a lewis dot structure first in order to see the total number a. electrons within the moleculeb. bonding and unshared pairs around central atomc. unshared pair within the molecule( i really need it )

Stage in which a typical star has completely stopped fusion