What is the correct definition of a compound? substance composed of identical molecules consisting of atoms of 2 or more
chemical elements.
material composed of 2 or more substances which retain their own characteristics.
homogeneous mixture of 2 or more substances that
do not retain.

The peak wavelength for the blackbody curve of a star is in the uv range. assuming the radiation from this star can reach earth, would you be able to see it?

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

What four properties do all waves have in common