The data or conclusions that result from careful experimentation can be described as
subjective
workable
hypothetical
empirical

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

Is laundry detergent an acid or a base?

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.