if the solubility of caffeine in water is 2.2 mg/ml at 25 °c,180 mg/ml at 80 °c, and 670 mg/ml at 100 °c, explain why the first step in the separation is to heat the ground up tablets.

how to make a simple air condition

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.