Procedure: a The density of metals First I obtained a quantity of unknown metal. The density of the liquid in the beaker can be adjusted, and a variety of objects can be studied during the investigation. The writing of laboratory reports is an essential part of any practical module in Psychology. Key measurements and formulae were also used to determine densities of metal and plastic objects as well as irregularly shaped rocks. Learning to write laboratory reports will provide you with a valuable and transferable skill. Density also does depend on temperature.
The spheres were dark and so could not be marked but one had a small dent in it and that was used as differentiation. Which is more accurate , the measured volume or the calculated volume? Light substances would float on water, so their density should be less than that of water. The experiment approach that will be used will tell the mass and volume of the metal and liquid determined by measuring these two quantities with a graduated cylinder and biuret. Hint: This should not be the same reason as the one you gave in question 7. The method used for determining the density of a substance depends on the nature of the substance. Using the tools you will find the mass and volume of the objects.
To determine the density of low boiling point liquid samples by measuring their mass at controlled volume; 2. This experiment uses this equation in different fashions to analyze certain substances and extrapolate unknown measurements from known measurements. All measurements were done in mm with a ruler and so were converted to cm3 at the end. When using the 50ml cylinder, I filled it with. Density calculations are also vitally important to ship builders in order to allow them to calculate how much weight a ship with a given sized hull can hold without sinking Smith, and Jewett 342. Determine the density of a solid sample by two methods Skills: -Practice basic measurement techniques of masses and volumes -Review accuracy and precision in measurement Pre-labquestions: Read both parts of the procedure;then answer these questions on a separate sheet of paper before coming to class on Thursday; turn them in at the beginning of class.
Any calculations should be shown here as well. This technique is called water displacement. In knowing the density of an object, further hypotheses can then be made. M or mass is the amount of matter that an object contains and it can be measured using a balance. In this experiment, the density of selected liquid samples will be measured using a pycnometer.
Add this measured volume of water to the 100 mL beaker. Use the same balance for the entire lab. Find out the identity of the metal in the cylinder andlook up and record the literature value of the density of that metal. In the second stage of this experiment, the density of two irregularly shaped objects was determined. Through the techniques used in this experiment, one can easily determine differing factors about regularly or irregularly shaped materials as well as liquids and gasses, and thereby determine their densities. Determinethe relative precision and accuracy of different glassware items. Record the volume of water plus metalcylinder.
The number of significant figures will be the same as the number in your least precise value. Is it true that the cube with the most mass will have the most density? With regard to gasses, one can use the information herein to realize the amount of gas contained within a container and thereby its density. Explain any trends in the data that will be used. Do notuse the 10 mL graduated cylinder to measure water for each container ortransfer the same water from container to container. In order to obtain a volume for these objects, a formula of length x width x height was used for the rectangle and cubes. Re-measure and record the mass ofthe beaker and water.
Procedure work in pairs, but each personshould turn in their own data sheet : PartOne — the density of water 1. Calculate the percent error of the metal cylinder density for both the cylindercalculation and water displacement methods, using the density value obtainedfrom a reputable source, such as the textbook. My hypothesis is that if the density of the sand-filled film container is less than the density of water, then the film container filled with sand will float. There are two main reasons for doing this: 1 Ease of communication: it is easier to find what you want from a study if it is written in the standard format. Measure the mass of a 100 mL beaker to the nearest. To calculate the volume of a rectangular object and to express the volume in volume metric units e. Upper Saddle River: Pearson Education, Inc.
The independent variable is the amount of sand in the film container. In this lab the densities of unknown irregularly shaped solids and liquids was determined. Calculate the density of the metal cylinder using the cylinder dimensions and the formulafor the volume of a regularcylinder. Which method is more precise , usingthe cylinder dimensions or water displacement? Attach this to the data sheet to turn in. To calculate the specific gravities of solids and liquids d.