Chem lab report Sample

Chem lab report Paper Apparatus: Tall glass cylinder, glass marble, rubber stopper, cork, 125-ml Erlenmeyer flask with stopper, 150-ml beaker, 10-ml pipette, pipette bulb, 100-ml beaker, Auber stopper, unknown rectangular solid, aluminum foil ?10 x 1 Com, 100-ml graduated cylinder, rectangle Materials: Methyl chloride, hexane, water, ice, unknown liquids Observations: Procedure Observations Water added to cylinder Water fills the cylinder. Methyl chloride added to water A layer of methyl chloride forms below the water. Hexane added to water Layer of hexane forms on top of the water. Glass marble added to cylinder Glass marble sank to the bottom of the cylinder. Rubber stopper added to cylinder Rubber stopper floats in between the layer of water and methyl chloride. Ice added to cylinder Ice floats in between the layer of hexane and water. Cork added to cylinder Cork floats on the layer of hexane B) Density of Water Items 1st Trial 2nd Trial Mass of flask and stopper+ water(g) 105. 51 Mass of flask and stopper(g) 95. 71 Mass of water(g) 9. 81 9. 80 Volume of water(ml) 10. 0 Density of water(g/ml) 0. 981 0. 980 Average density of water(g/ml) C)Density of Unknown Liquid 102. 7 Mass of unknown liquid(g) 6. 56 Volume of unknown liquid(ml) Density of unknown liquid(g/ml) 0. 656 Average density of unknown liquid(g/ml) D)Density of Rubber Stopper Mass of rubber stopper(g) 5. 085 Final cylinder reading (ml) 69. 0 69. 5 Volume of rubber stopper(ml) 5. 0 5. 5 Density of rubber stopper(g/ml) 1. 017 0. 925 Average density of rubber stopper(g/ml) 0. 971 E)Density of Unknown S olid Mass of solid(g) 11. 35 11. 455 Length of solid(CM) 7. 7 7. 70 Width of solid(CM) 3. 0 3. 00 Thickness of solid(CM) 1. 1 1. 10 Volume of solid (CM) 25 25. 4 Density of solid(g/CM) 0. 45 0. 58 Average density of solid(g/CM) F)Density of Aluminum Foil Measurement Density of foil(g/CM) 2. 70 Length of foil(CM) 10. 90 Width of foil) 10. 00 Mass of foil(g) 0. 39 Volume of foil (CM) 0. 163 Thickness of foil(CM) 1. 50 x 10-3 Discussion: The main objective of this experiment is to identify the density of the liquid and the solid. Density which is define as the amount of mass in a given volume is calculated by dividing the mass by volume of the object. For the first experiment (A) the instructor demonstration, the density of four objects and three solutions are being observed and investigated. We will write a custom essay sample on Chem lab report specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Chem lab report specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Chem lab report specifically for you FOR ONLY $16.38 $13.9/page Hire Writer The objects or solutions with higher density have bigger mass. So the position of objects and the solutions when being mixed together, determine its density. Procedure of the experiments with the addition of water, methyl chloride, hexane, glass marble, rubber stopper, ice and a cork into the tall glass cylinder. The position of every objects and solutions varies according to its densities. The theoretical value of water density is leg/ CM. The position of water is between the hexane with a density of 0. Egg/ml and the methyl chloride with a density of 1. 33 g/CM. Hexane layer forms above the layer of water and the layer of methyl chloride forms below the layer of water. Glass marble sank at the bottom of the cylinder. The position of stopper is between the layer of methyl chloride and the layer of water. Methyl chloride is denser than stopper and the stopper is denser that water. The position of ice is between the layer of water and the layer of hexane. Water is denser than ice and the ice is denser than hexane. The cork float at the bottom of hexane, so, the hexane is denser than the cork. So the density decreases from marble, methyl chloride, stopper, water, ice, hexane, and cork. For the second experiment (B), the density of water is determined by obtaining the amount f mass in a given volume. The mass of the water is determined by a method called the weighing by difference. The mass of water is obtained by subtracting the weight of empty flask with the weight of flask containing water. The volume of water is fixed, 10. Ml. The procedure is repeated twice to calculated the average density of the water. The theoretical value of density of water is 1 g/ CM and the actual experimental value is 0. Egg/ml. As conclusion, the density of water from the actual experimental value is accurate to the theoretical value. For the experiment C, the density of unknown liquid is determined by obtaining the amount of mass in a given volume. The mass of the unknown liquid is determined by a method called the weighing by difference. The mass of unknown liquid is obtained by subtracting the weight of empty flask with the weight of flask containing the unknown liquid. The volume of the unknown liquid is fixed, 10. Ml. The procedure is repeated twice to calculated the average density of the water Then, the average density of the unknown liquid is calculated by viding the mass with the volume of unknown liquid and the result is 0. Egg/ ml. For experiment , the density of rubber stopper is determined by a technique called volume by displacement. The volume of an irregular object can be found directly from the amount of water displaces. The initial reading of the water in the graduated cylinder is measured, and the rubber stopper is added to the graduated cylinder and the final reading of water is recorded. The d ifferences between the final and the initial reading of graduated cylinder is recorded as the volume of the rubber stopper. The mass of rubber stopper is measured. Hence, the volume and the mass of graduated cylinder obtained are used to calculate the density of rubber stopper. The procedure is done twice so that the average reading of the density of rubber stopper can be calculated. For the experiment of E, the density of unknown solid is determined by calculating the volume of the unknown solid and its mass. The rectangular solid is weighed and the value obtained is 11. Egg. Then the length, the width and the thickness of solid is measured using metric ruler and the volume of the rectangular solid is lactated, 7. CM X 3. CM X 1. CM= CACM. Hence the density of the rectangular solid is calculated. The second trial experiment is done for the volume of the rectangular solid using a different balance and the metric ruler to calculate new densities. For the experiment of F, the volume of aluminum foil is determined by dividing the mass of the aluminum foil by its density. The aluminum foil is weighed and the value obtained is 0. Egg. Then the length, the width of aluminum foil is measured using metric ruler and the thickness of the aluminum oil is calculated by dividing the length and the width of aluminum foil by the calculated volume of aluminum foil. Conclusion: The purpose of the lab experiment is to determine the density of liquids, solids with a regular shape and an irregular shape. Density is derived unit that measures the amount of matter in a given unit volume. The formula for density is ( density= mass/volume). The procedure to determine the density of a given material varies among each other. There are some techniques that can be applied such as weighing by difference which is suitable to find the volume of liquid and volume by escapement which is suitable to find the volume of irregular solid.