After earning a learners license what test must be successfully passed to earn an operator's license

The electronic structure or chlorine is 2.8.7 what is the electronic structure of fluorine?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

Carbon is allowed to diffuse through a steel plate 15 mm thick. the concentrations of carbon at the two faces are 0.65 and 0.30 kg c/m^3 fe, which are maintained constant. if the preexponential and activation energy are 6.2 x 10-7 m2 /s and 80,000 j/mol, respectively, compute the temperature at which the diffusion flux is 1.43 x 10^-9 kg/m^2 -s.