To power a flashlight for 1 second, we need of energy

Select the correct lewis structure for fluorine which is group 7a element?

1.17 mol hcl and 2.5 mol naoh react according to the equation hcl + naoh -> nacl + h2o . if the limiting reactant is hcl, determine the amount of excess reactant that remains. answer in units of mol.

Which best describes eras and periods?