Name: 6.03: Calorimetry Data and Observations: Part I: Insert a complete data table, including appropriate significant figures and units, in the space below. Also include any observations that you made over the course of part I. (4 points) I observed that when the metal is placed inside the calorimeter, it transfers heat to the water making the water increase temperature while the metal will decrease temperature. I also noticed that the system was the metal and the surroundings is the water, this is because the water is taking in the heat from the metal making the water warm. Metal Name Mass of Metal Volume of water Initial temp.
Abstract The objective of the south street seaweed experiment is to make a tincture of iodine. Iodine is used commercially as an antiseptic on cuts and scrapes of the skin. Conceptually, one of the active ingredients of the tincture, iodide, can be extracted from seaweed. By adding the seaweed to water and applying heat energy into the mixture, we were able to extract iodide. After adding Iodine salts, and filtering the mixture our next goal was to test for three important chemicals that must exist in our mixture for it to be a true iodine tincture; Iodine, Iodide Ion and the triiodide ion.
Lab 6: Determination of Water Hardness using a Titrator Name: Brendan Lee Lab Partners: None Date of Experiment: 7/21/11 Location: My house Course Number: CHE 111 Abstract: The objective of this experiment was to develop familiarity with the concept of water hardness, practice titration using a titrator, and to determine the hardness of the local water supply. This will be done mainly by using EDTA (ethylenediamenetetraacetic acid) to test the indicator and titrating water with it. The amount of water (and therefore the amount of calcium and magnesium ions) needed to set off the indicator will be used to calculate the hardness of the water. Experiment/Observations: There are three parts involved in this experiment. The first part involved testing the indicator.
5. Compute a linear least-squares-fit of the calibration data and plot the resulting line on the same graph as the calibration data. Comment on the linearity of the pressure transducer and scannivalve. Part 3: Calibration of the Tunnel 1. Connect the micromanometer (calibrated in Part 2) across the wind-tunnel contraction in order to measure the static pressure drop.
Heats of Solution and Reaction Name: Cindy Hernandez Purpose: The purpose of this experiment is to decided if the chemical reactions are exothermic and endothermic. By finding the differences between each temperature. Overview: For this lab, we had three different chemicals involved NH4Cl, H2SO4, and NaOH. What we did with these chemicals was that we added water, except NaOH we added HCl, was that we combined both mixtures to determine if there was a temperature change. The reason why we're determining if their was a chemical reaction is to identify if it is exothermic or endothermic.
AP Biology November 3, 2011 Lab 1: Diffusion and Osmosis Objectives: * Measure the water potential of a substance in a controlled experiment. * Determine the osmotic concentration of living tissue or an unknown solution from experimental data * Describe the effects of water gain or loss in animal and plant cells * Release osmotic potential to solute concentration and water potential Introduction: Diffusion is the process that allows particles or molecules to move from an area of high concentration to an area of low concentration. This process accounts for the movement of many small molecules across cell membranes. The rate of diffusion of particles will be affected by the steepness of the concentration gradient or the difference in concentration between two areas. Diffusion can only occur across a membrane if there is a concentration gradient and the membrane is passable.
To note the endpoint of the reaction, a pH electrode probe is placed in the reactant. In understanding and finding out the results of the laboratory, it is important to know its components, find the percent composition to see how much acetic acid is in vinegar, and to find the pH solution of vinegar. Experimental Investigation One: First, be sure that the temperature and the pH electrode are set up and are connected to LoggerPro software. Rinse the probe with distilled water after you unscrew the top cap and then dry afterwards. To calibrate the
Pre Lab Objective: The purpose of this lab is to obtain the mass and volume of two different metal samples, to graph data, to obtain the slope of graphed data and to display a best fit curve of experimental data in order to graphically determine the density of each metal Background: Understanding the relationship that exists between a substance’s mass and its volume. This relationship is expressed by the physical property called density. (D = M/V). In order to determine the volume of solids, a technique called water displacement is used. A fixed amount of water is added to a graduated cylinder and the volume of water is recorded.
Osmotic pressure, one of the colligative properties previously discussed, is defined as the pressure used by the water flow through a membrane separating two solutions with different concentrations of various solutes. The purpose of this lab was to assist in the educating one upon the freezing points of a pure solvent compared to that of a solvent found within a nonvolatile solute, while at the same time understanding and gaining a greater depth of osmosis. I greatly enjoyed this lab, although I wish it could have been conducted in less time. Observations: I took note of several components of the lab conducted. The dialysis tubing was one I especially monitored, checking every hour with recordings.
The cross section helped to better understand the thickness, flow direction and distribution of the aquifer(s) within the mapping area. 3 river stream gages are placed in the stream in order to better understand the relationship between groundwater and surface water by giving quantities of discharge/recharge in cubic feet per second (cfs). Understanding the relationship between the groundwater and surface water gives aid for producing the potentiometric surface map which includes the gaining (effluent) and losing (influent) parts of the stream. Results Two aquifers were located, a confined and unconfined aquifer. The unconfined aquifer, or the upper aquifer, (see cross and contour map) consists of a predominately sand rich and partial gravel unit and is approximately 50 feet thick.