Determination of Unknown Block Material and Uncertainty Analysis Xuan Wang TA: Saurabh Chawdhary ME4031W Lab Section 014 4:40PM Wednesday 2/10/2013 Abstract People discovered many methods to determine the properties of unknown materials (harness, density, or elastic modulus etc.). In this lab, the task is to find the density of an unknown block. If the dimensions and mass of unknown block can be obtained, the density can be calculated by block mass over block volume. After comparing the result density value to a reference chart, the specific material category can be determined. Dimensions can be measured by using a caliper and a micrometer and mass can be determined by putting the block onto an electronic balance.
Alex Evans Sanders Dellinger Ryan Shockney Rashaad Williams October 18, 2010 Experiment 29 Procedure Proposal In this experiment, the experimenter will be given a one gram sample of Chromite. Chromite is defined as an Iron Magnesium Chromium Oxide. The objective of this lab is for the experimenter to determine if Iron, Magnesium, and Chromium are in the unknown sample, and from these conclusions, infer if the unknown sample is actually Chromite. In doing this, multiple laboratory skills are needed, along with general knowledge on the elements comprised in the experiment to be covered. As aforementioned, the main objective of this lab is to determine whether or not the unknown sample is in fact chromium.
5.51: Which Reagent is limiting and How Much Precipitate is formed? SCH-3UI-03 David Yu Mrs. Hatton Due Date: May 5, 2012 Cut-Off Date: May 12, 2012 Purpose: To experience and use what you have learned in class about gravimetric stoichiometry by predicting and determining the mass of precipitate of two reactants and then comparing what you experience and what you calculated. Background: Avogadro’s constant is 6.02 x 1023 to find the number of entities. A mole is a useable amount of chemicals that is practical to use. The molar mass of a compound or atom is the mass of 1 mole of anything; this is relative to the atomic mass from the periodic table.
I then measured hot tap water versus boiling water, and then cold tap water versus water with ice, and recorded the temperature that was read on the thermometer, and then converted the temperature from Celsius (C), to Fahrenheit (F), and Kelvin (K). To understand how to measure mass, the lab required the following material: pen or pencil, 5 pennies, 3 quarters, 4 dimes and a key. Then I used the digital scale to measure the following objects to obtain its mass and recorded the data. For exercise 2, volume, density and concentration, I started off measuring the graduated cylinder to get its mass. From that mass, I was
Connor Schroeder Vector experiment Objectives. : The objective is to determine the components of a single vector and to find the sum of two or more vectors using the force table. Apparatus : A force table, mass hanger and a slotted mass set are required to complete this experiment. Experimental procedure: On the table, you set a 200 gram mass at 30 degrees. Then you place another 200 gram mass on the 210 degree mark.
For first harmonic, our wavelength was 1.200 m, found by the formula λ=2L/n. In the second part we used tension and velocity to find mass density. For the first notch, with a tension of 10.3 N, the velocity was 86 m/s with a overall mass density of 0.018. Discussion In the lab we wanted to find the frequency at which resonance occurs on a stretched wire as well as look at the relationship between the frequency of vibration and tension and linear mass density of the wire. For the first procedure, we increased the frequency until we found resonance, and recorded frequencies and nodes to calculate wavelength.
This is similar to theoretical percent that you used to calculate the percent error in an experiment. The actual yield is the amount of product that is actually obtained in an experiment. This is similar to the actual or experimental percent you used to determine the percent error in an experiment. The formula for percent yield is Actual yield x 100 Theoretical yield For example: if a reaction actually gave you 6.63 g of nitrogen instead of the predicted 10.6 g, the percent yield of nitrogen would be: 6.63 g N2 x 100 = 62.5 % 10.6 g N2 1. According to her pre-lab stoichiometric calculations, a student’s lab experiment should have produced 5.51 g of NaCl.
Experiment 5- Limiting and Excess Reagents Purpose The purpose of this experiment was to calculate product and reactant amounts using reaction stoichiometry, as well as calculating the limiting and excess reagent in a copper (II) nitrate and potassium iodide reaction. We tested the reaction with different amounts of Cu(NO3)2 and KI making duplicates of each, with a total of 4 test tubes per group. Procedure Found in lab manual starting on page 91. 1. Collect 4 small test tubes and weight them.
Mariah Munson Lab, Week #1 BALANCE LAB Introduction <Include purpose of lab experiment> The purpose of the Balance Lab is to learn how the ILab works and also how to correctly determine the mas of a chemical. <Brief summary of topic investigating> We will lean how to read the mass off the balance, and how to find a weight of an item that is measured in a container, and how to use the centigram balance. <State major finding> I learned what the centigram balance is, it has two decimal place precision. Procedure <Include information that the reader would need to repeat your experimental procedure. Do not include any observations or results in this section?
Wave Lab Objectives The objective of this experiment is to learn how to properly find the velocity of a wave using 2 different methods. Materials Meter Stick Stop Watch Wave Machine Spring Procedure Wave Machine – Method 1 1) Measure length of wave machine with meter stick and record length. 2) Count out and record how long it takes 15 passes to occur by one partner gently creating a wave on the wave machine. Tip: remember to start at 0 when you count 3) After you have recorder your data from step 4 calculate the total distance traveled by the wave. Ex.