Consider the rate law below. r=k[a]^2 . what effect does doubling the concentration have on the rate ? a - doubles the rate b - triples the rate c - quadruples the rate d - no effect on the rate

Determine the mass of fuel required for the expected energy consumption in the united states for the next ten years. energy use per person per year in the united states = 3.5 x 1011joules base calculations on current population of 310,000,000.

What element breaks down into yttrium-90?

Compare and contrast physical changes with chemical changes.