1.Which of the following demonstrate s a chemical reaction? a. Boiling water
b. Lighting incense sticks
c. Melting ice cubes
d. Subliming mothballs

2.which following is a chemical reaction
a. salt dissolved in water
b. Food spoilage
c. crystallization of fish sauce
d. Melting ice cream

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion

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.

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy