Uestion Select all the correct answers.
Which of these events indicate that a chemical reaction might have occurred?
Silver jewelry becomes dark because of tarnish.
Water evaporates from salt water and leaves salt behind.
Aliquid bubbles when heated.
A solid appears when two water-based solutions are added together.
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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.