To draw a Lewis structure for a covalent compound, being by calculating A, the available electrons, and N, the needed electrons. What is A for silicon tetrachloride, SiCl4?

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.

What mass of glucose is produced when 54g of water react with carbon dioxide

What is the difference between a substance "getting wet" and "being dissolved" in a liquid at the particulate level?