En una pràctica de laboratori els fan reaccionar 24 grams d'etanol amb 59 grams de bromur de fòsfor (II) i obtenen 36g de bromur d'etil. Calcula quin és el reactiu limitant i quin és el reactiu en excés. Recorda revisar si la reacció està ajustada! C2H5OH + PBr3 C2H5Br + HPO3

Which form of cell division creates the sperm and egg, resulting in half of the chromosomes as the other cells?

Avertical clean glass piezometer tube has an inside diameter of d = 1 mm and is used to measure pressure in a horizontal pipe carrying water as shown. due to pressure in the pipe, the water at 20c rises into the tube to a height h. if the water pressure in the pipe is p = 500 pa gauge, estimate the height h: (a) without considering surface tension (b) with surface tension (capillary) effects. the contact angle  can be assumed at 30 deg

This is a form of winter precipitation. it is frozen precipitation falling as ice pellets. snowflakes melt into raindrops as they pass through a thin layer of warmer air. the raindrops then refreeze into particles of ice when they fall into a layer of sub-freezing air near the surface of the earth. this precipitation is called a) hail. b) rain. c) sleet. d) snow.