For similar light intensity, compact fluorescent bulbs use about 25% of the energy of incandescent bulbs. let's say you replaced a bulb of 40 w with a fluorescent bulb and that your utility charges $0.15/kw-hour. how many dollars would you save in electricity in the 10,000−hour lifetime of the bulb?

Calculate the h3o+ concentration in a solution of acetic acid if the concentration of molecular acetic acid present at equilibrium is 9.97x10^-3 m and k for the dissociation is 1.86x10^-5. ch3cooh(aq)+h2o(> h3o^+(aq)+ch3coo^-(aq)

Explain which group an element with the electron configuration 1s2 2s2 2p6 3s2 3p6 3d1 4s2 belongs to.

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.