Wich diagram correctly represents the mass of one chemical reactions

What is important to study for nios grade 12 chemistry? i have only one month left.

What happens when light is scattered?

Remember to use the proper number of significant figures and leading zeros in all calculations.gelatin has a density of 1.27 g/cm³. if you have a blob of gelatin dessert that fills a 2.0 liter bottle, what is its mass? 2540 g2500 g3.9 x 10-43.937x 10-4