CHM113 Exam Questions And Answers (Verified And Updated)

CHM113 Exam Questions And Answers (Verified And Updated) Density - answerRatio of Mass to Volume Physical property - answerCan be observed without changing the matter Intensive property - answerIndependent of the amount of matter (density, color) Extensive Property - answerDepends on the amount of matter (mass, volume) At what state and temperature is water most dense? - answerLiquid, 4 Can extensive properties impact intensive ones? - answerYes. Freezing of a balloon decreases the volume. Order the states from most dense to least dense - answersolidliquidgas specific gravity - answerratio of the density of the substance to the density of water What information must be included with specific gravity? - answerTemperature What is water's maximum density? - answer1.00g/mL Where else is density important? - answerRock formations For a piece of wood with L=10.35cm, W=6.42cm, H=1.90cm, and mass=72.412g calculate density - answer0.574 g/cm^3 Calculate Density: A cylinder has d=1.28, h=3.85, mass=39.730g - answer8.02 g/cm^3 A rock weighs 143g in air, 82g in water. What is the mass of H2O displaced, Volume of H2O displaced, Density of the rock? - answer61g,61mL,2.3g/mL A graduated cylinder weighs 28.102g. A solution has been created which levitates a piece of PVC. The graduated cylinder containing 6.25mL of that solution weighs 34.200g. What is the density of the solution and the PVC suspended in it? - answer0.976g/mL Give the equation of specific gravity - answerdensity of substance/density of water What are the units of specific gravity? - answerNone To find the density of PVC, you will add dilute calcium chloride to concentrated calcium chloride. The PVC will _____ when the density of the PVC matches the density of the solution. - answerLevitate The mass of a rock in air is 0.215kg. When the rock is lowered in to water, its mass is 0.187kg. What is the volume of the displaced water(mL) and the density of the rock? - answer28mL,7.7g/cm^3 Calculate the density of the metal cylinder m=927.80mg r=1.80cm h=6.32cm - answer0.0144g/cm^3 What is the difference between density and specific gravity? - answerDensity is the ratio of mass to volume of a substance. Specific gravity is the density of a substance divided by the density of a reference substance (usually water at 4 degrees) Units of density? - answerg/cm^3 Why do some things have a high density and others have a low density? - answerIn some materials, matter is packed more closely together so there is more of it per unit volume. In other materials, the kinetic energy of the atoms may be faster so they move more and take up more volume. Why is density an important physical property? - answerIt is an intrinsic property so it can be used to identify a substance. Which determination of density has the highest error? - answerThe spring scale. It was the hardest to read and varied the most in measurements. Which do you think had the lowest error? - answerThe measurement of the metal cylinder. Only two ruler measurements were taken. What is the conversion from cm^3 to mL? - answer1cm^3=1mL One cm^3 us a cube. The amount of a substance that fills that cube is equivalent to one mL. Why do ice cubes float in water? - answerIce cubes have a crystalline structure with a low density(the water molecules are a fixed distance apart). Liquid water is more tightly packed than this distance so it has a higher density than ice. What is the molecular formula of adipic acid? - answerH2C6H8O4 What is adipic acid used for? - answerfood flavorings, synthesis of nylon6-6, upholstery, carpet fibers, clothing, tire reinforcements, and auto parts