CHEM 103 Lab Exam 1Questions & Answers 100% Correct!

When making observations, what are the things you should describe? - ANSWERsmell, 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? - ANSWERThe 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)? - ANSWERyes Equation for density - ANSWERmass divided by volume (g/mL) 1 mL is equal to how many cubic cm? - ANSWER1 Density of pure water - ANSWER1.00 g/mL Equation for volume - ANSWERlength x width x height What is the displacement method? - ANSWERthe 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? - ANSWERa 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? - ANSWERa 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? -