Which of the following substances did Robert Brown observed upon forming the concept of Brownian motion? A. Talc powder suspended in water
B. Talc powder suspended in air
C. Pollen grains suspended in water
D. Pollen grains suspended in air

How much would the freezing point of water decrease if 4 mol of sugar were added to 1 kg of water(k=1.86 c/mol/kg for water and i=1 for sugar

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

Which element is the least metallic between cadmium, silver, zinc, or iron?