Using a tool requires the correct technique. which describes the technique that is used with a graduated cylinder? a- record the line that the bottom of the meniscus touches. b- align the tick mark at one centimeter with the left edge of the object c- slide the masses to the right until the beam rests at the zero point. d- notice which color ph papers turns after it is dipped into a liquid ( by the way this is a science question)

Cryolite, na3alf6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. start this question by first balance the chemical equation.1.) balance the equation: - alo3(s)+naoh(l)+hf(> na3alf6+h2o(g). 2.) if 17.5 kilograms of al2o3(s), 51.4 kilograms of naoh(l), and 51.4 kilograms of hf(g) react completely, how many kilograms of cryolite will be produced? 3.)which reactants will be in excess, (al2o3, naoh, or hf) 4.)what is the total mass of the excess reactants left over after the reaction is complete in kg?