Complete the following reaction equations and identify the type of reaction. Reaction Type:
H-C=C-H + O
+ O2

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?

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.

Air can be considered a mixture. which statement does not explain why?