CHEM 103 Lab Exam 1 2023 with 100% correct answers

When making observations, what are the things you should describe? smell, appearance, and state of matter of chemicals before and after the reaction, how long the reaction occurred, and names of chemicals What is the density of a substance? The amount of matter contained in a specific sized sample of that substance; mass per unit of volume Will the density of a given substance always be the same despite the volume (as long as the are under the same specific set of conditions)? yes Equation for density mass divided by volume (g/mL) 1 mL is equal to how many cubic cm? 1 Density of pure water 1.00 g/mL Equation for volume length x width x height What is the displacement method? the volume of an irregularly shaped object can be measured indirectly by observing the amount of liquid it displaces in a graduated cylinder. What is decantation? a process of separating a solid residue (precipitate) from a liquid (the supernate) by gently pouring off the liquid without disturbing the solid that has settled to the bottom What is filtration? a process of separating a solid from a liquid by using a filter through which the liquid, but not the solid, can pass. To speed up the process, suction can be used make it faster by placing a filter in the bottom of a Buchner funnel (vacuum filtration). What is a piece of glassware designed to accurately measure volumes of liquids? graduated cylinder What is the curved surface of a graduated cylinder? meniscus When reading a graduated cylinder, always make the reading where? at eye level, from the bottom of the meniscus; always estimate one more digit than you can read from the scale Which is more dense: pure water or salt water? salt water What is a volumetric pipet? an instrument used to measure volume more accurately and precisely. Will measure and deliver only one specific volume Define solubility the amount of substance (solute) that will saturate or can be dissolved in a given amount of solvent.