the precision of each of their measurements; therefore‚ multiple instruments were used in three out of the four labs. Method: In the first part of the lab‚ Rulers vs. Calipers‚ the experimenters were asked to compare the precision and accuracy measuring the same objects with a ruler and a caliper. Materials: One marble One washer String One 8 oz styrofoam cup Procedures: Step one: The experimenters used the ruler to measure the diameter of the marble then recorded the measurement‚ along with
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method would consistently test the foam and ensure it has the correct density? Background: There are words that need to be understood before executing the experiment. The first thing you need to know is density. Density is a measure of mass per unit of volume. The reason for testing density of doors because doors must contain a density of 14.34lbs per ft3 of foam‚ or it will collapse if the density is too high. If the density is too low‚ it won’t allow for normal expansion during weather changes
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errors random errors. This experiment aims to show how errors are encountered in measuring an object. Three instruments‚ namely the foot rule‚ vernier caliper‚ and micrometer caliper‚ were used to measure the diameter of a metal sphere. Ten independent measurements were taken per instrument. Statistical computations were performed to show the accuracy and precision of each instrument. Upon computation of the volume and density of the sphere based from the mean diameter‚ the percent error for each instrument
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all there were seven samples‚ namely water‚ isopropyl alcohol‚ coconut oil‚ wooden block‚ marble‚ pebbles‚ and an unknown liquid sample. For the density of water‚ a clean and dry 100ml graduated cylinder was weighed and 50ml of water was added into the graduated cylinder. The graduated cylinder with water was weighed again to get its mass. For the density of a liquid other than water‚ a clean and dry 10ml graduated cylinder was weighed and 5.0ml of the different liquid samples (isopropyl alcohol‚
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Experiment 2: Laboratory Techniques and Measurements Course Number: CHE 111 Abstract: This experiment introduced the student to lab techniques and measurements. It started with measuring length. An example of this would be the length of a nickel‚ which is 2cm. The next part of the experiment was measuring temperature. I found that water boils around 95ºC at 6600ft. Ice also has a significant effect on the temperature of water from the tap. Ice dropped the temperature about 15ºC. Volumetric
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De La Salle University -Dasmariñas College of Science PHYSICAL SCIENCES DEPARTMENT Dasmariñas City‚ Cavite GUIDELINES FOR PRE-LABORATORY AND POST-LABORATORY REQUIREMENTS FOR GENERAL CHEMISTRY A. Introduction Scientific writing is part of the job description of a researcher in the fields of Science‚ Medicine‚ and Engineering. A scientific paper is
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The circumference of the candle was 7.5 cm. The candle’s width was 2 cm. The state of the candle was solid. The candle was already used and burned. The base’s circumference was 8 cm. The candle is buoyant in water‚ The candle’s volume is 66 ml. The density of the candle is 0.897 g/ml. The candle gave off no odor. The top of the candle had a smooth texture. The base of the candle had a rough texture from the dried‚ running wax. After the five minute burning period was completed‚ the following observations
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fluid displaced. If the body immersed is a sphere of volume V and radius r‚ the volume of fluid displaced is also V. Thus if the density of the fluid is L‚ FB = VLg 4 = r3 Lg 3 (iii) (2) Stokes showed that for a sphere of radius r moving through a fluid of viscosity ‚ the viscous drag is FD = 6vr (3) where v is the steady velocity. (iv) If the density of the sphere is S‚ then the gravitational force is 4 Fg = 3 r3 Sg (4) (v) Substituting (2)‚ (3) and (4) into (1) 4 4 6vr
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Zn(NO3)2 into well A3 of the 24-well plate. 4. Place 10 drops of Iron (III) chloride‚ FeCl3 into well A4 of the 24-well plate. 5. Place 10 drops of Copper (II) sulfate‚ Cu SO4 into well A5 of the 24-well plate. 6. Take the metal solids from your LabPaq; there should be one piece each of magnesium‚ zinc‚ and iron plus two pieces of lead. Note: Magnesium and lead oxidize very easily and an almost invisible oxidation layer may coat the metal. To insure good reactions you should scrape the surface
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significant figures) Experimental errors are the difference between recorded value and generally accepted or literature value. There are two types of experimental errors: random and systematic errors. Random errors are caused by the readability of a measuring instrument‚ the effects of changes in the surroundings‚ insufficient data‚ and observer misinterpretation. Systematic errors are errors that can not be reduced by repeating experiments or careful experimental design. These errors are caused by
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