The substances sodium (Na), oxygen (O2), and sodium oxide (Na20) participate in this chemical reaction
4Na + O2 + 2Na20.
Which statement best describes the reaction?
A. Elements rearrange, but no compounds are created or destroyed.
B.
OC.
Sodium oxide is created by the chemical reaction.
Atoms from sodium oxide rearrange to form sodium and oxygen.
In a mixture of the three substances, sodium oxide separates from the sodium and oxygen.
D.
What is the answer

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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.

Which of the following are sources of revenue for media companies? a. direct sales to producers b. advertising and subscriptions c. online purchase d. capital investments