Test Tube D Experiment

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Bromothymol blue (BTB) is a pH indicator that has a color of yellow in acidic state, blue in basic state, and green in neutral state. The experiment that Rosa did is to find what species do photosynthesis and/or cellular respiration by observing changing in pH level in the water due to biological processes of living organisms in different tubes. The tube D is the control that had no variable added. So, it shows that the water with BTB would stay same, the basic state in the blue color. Test tube A had a water snail, and after an hour, the BTB changed to yellow which means there was a some type of process that turned basic water to acidic. A water snail does cellular respiration because all living organisms do cellular respiration to absorb

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Enzyme Lab Report

Label A as 4ºC, B as 25º C, C as 100ºC , D as pH 4, E as pH 7 and F as pH 10 . Then add 2 ml of milk to test tubes A-F. On test tubes A-C ( test tube A put in an ice bucket for 4ºC, test tube B put on lab bench for 25ºC, and test tube C put in 100º C water bath for 100ºC) put them in the environment of the corresponding temperature labeled. Leave test tubes A-C alone, now set a timer for two minutes and set aside. Quickly add 1 ml of lactase to test tubes D-F, now start the timer. At the end of the…

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Oxygen and Aerobic Respiration Essay

Abstract This report serves to show the findings of lab 11.4. This lab provided datum about the extent of aerobic respiration in both germinating and nongerminating peas. The findings of the experiment proved that germinating peas, or reproductively able peas, use significantly more oxygen than nongerminating, or heat killed, peas, as anticipated by the students performing the lab. Aerobic respiration was necessary for the germinating peas because the oxygen released energy from the peas’ glucose…

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Test to Determine the Presence of Glucose Essay

Experiment 2. The test for glucose (a) Half fill a beaker with tap water and place it on a tripod and gauze. Heat the water with a Bunsen burner. While waiting for the water to boil, carry on with instructions (b) to (d). (b) Label four test-tubes 1-4. 1% starch solution into tube 1 10% glucose solution into tube 2 (c) Put 20 mm (depth) of…

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Electron Geometry Lab

Introduction The purpose of this lab is to practice identifying different molecules, and be able to determine their electron and molecular geometries. And use that to find their different angle. Electron geometry is found by seeing how many electron shells are present, and molecular geometry if found by how many lone pairs are present. The next thing that must be done is to find the polarity of the molecule by combining different solutions together. Procedure The first model molecules were built…

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Essay on 04 Determining Molar Mass by FP Depress

(3.9°C•kg/mol for lauric acid in this experiment1), i is the van’t Hoff factor, and m is the molality of the solution (in mol solute/kg solvent). Since lauric acid is not ionic, its van’t Hoff factor is essentially equal to 1. OBJECTIVES In this experiment, you will • • • • Determine the freezing temperature of the pure solvent, lauric acid. Determine the freezing temperature of a mixture of lauric acid and benzoic acid. Calculate the freezing point depression of the mixture. Calculate the molecular…

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Example Lab Report Exp 4 Essay

Melissa Chemi 1105 David Pinkston September 28, 2012 Experiment 4: Physical and Chemical Properties PURPOSE: Observe physical and chemical properties of pure substances. PROCEDURE: 1. Place small amounts of a material into 4 test tubes. 2. Observe and record the color and scent of the material. 3. Take one of the test tubes and hold it over a flame using a clamp. Record any reaction the material has to heat. 4. Take a second test tube and fill it ¼ of the way with cold distilled water. Record how…

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Essay about Enzymes: Enzyme and Test Tube

Enzymes Experiment 5 October 29, 2013 Objective: This experiment it designed to assist one in becoming acknowledged with enzymes. They will then learn why these enzymes are important and why it is used often in organic systems. The lab will also give them the chance to look at the activity rates of the enzymes and determine how it can be affected by environmental conditions. These conditions include temperature, pH, and substrate concentration. Abstract The process…

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Essay on Qualitative Anion Tests

Exercise 14: Qualitative Anion Tests PURPOSE: The purpose of this experiment is to identify some commonly occurring anions & to study some of the reactions used for their identification. PROCEDURE: You must first determine to which of the three groups the various anions belong. Since no two people observe the same event in exactly the same way it is important to also conduct specific confirmation tests on the known samples of each anion. This information will help identify the anion…

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Lab Experiment 6 : Chemical and Physical Properties Essay

Lab Experiment 6 : Chemical and Physical Properties Lab Experiment 6 : Chemical and Physical Properties Purpose: The purpose of this lab is to test substances and to determine the physical and chemical properties of substances. Material matches, glassbeaker 100 mL, burner-fuel, goggles-Safety, stirring rod - Glass 1 test tube(5), 13 x 100 mm in bubble bag, test-tube-clamp-holder test-tube- cleaning-brush,well-Plate-24, well-plate, litmus paper, blue - in…

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Lab 1 The Determination of R Essay

2015 Abstract An experiment was performed to determine “R”, the gas-law constant, using both the ideal gas law equation and the van der Waals equation. An ideal gas is considered a hypothetical gas whose pressure, volume, and temperature behavior correlates to the ideal gas equation, PV=nRT (Brown, et al. 2012). Using an apparatus involving a test tube and large beaker with rubber stoppers and tubing and equalized atmospheric pressure, the test tube contained approximately 0.02 g of…

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