If we look up in to the night sky and observe which stars appear to be the brightest. What are we actually observing?

A. Distance from the Earth

B. Apparent magnitude

C. Absolute brightness

D. Luminosity

Consider the reaction of a(g) + b(g) + c(g) => d(g) for which the following data were obtained: experiment initial [a], mol/l initial [b], mol/l initial [c], mol/l initial rate, mol/l.s 1 0.0500 0.0500 0.0100 6.25 x 10^-3 2 0.100 0.0500 0.0100 2.50 x 10^-2 3 0.100 0.100 0.0100 1.00 x 10^-1 4 0.0500 0.0500 0.0200 6.25 x 10^-3 what is the rate law for the reaction?

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

The identities of substances are the same before and after which type of change