What is Kb for N2H4 if the pH of a 0.158M solution of N2H5Cl is 4.5?

What is the relation between concentration of reactants and the rate of chemical reaction?

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

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?