using spectroscopy and graphical analysis. We will be using beers law to find the unknown concentration of dye in a sports drink. Materials: Beakers‚ 50-mL‚ 2-3 ; Test tubes (13 x 100)mm 3-8 ; FD&C Blue 1 stock solution‚ 50-mL ; Lens tissues ; Pipets‚ serological‚ 10-mL ; Sample of consumer sports drink‚ 10-mL ; Spectrophotometer ; Test tube rack Procedure: 1) Preeminently‚ follow all laboratory safety guidelines ensuring that you have safety goggles on at all times throughout the lab. 2) Fill
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bulb one cuvette Distilled water five 20*150 mm test tubes test tube rack two 10 mL pipets or graduated cylinders stirring rod two 100 mL beakers procedures 1. Obtain and wear goggles. 2. Obtain small volumes of 0.40 M CuSO4 solution and distilled water in separate beakers. 3. Label four clean‚ dry‚ test tubes 1–4. Use pipets to prepare five standard solutions according to the chart below. Thoroughly mix each
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An Investigation Into the Factors Affecting the Rate of a Chemical Reaction Title of your investigation An investigation into the factors affecting the rate of a chemical reaction 1. Aim of investigation To investigate the major factors that affect the rate of corrosion. 2. Motivation (explain why you have chosen to investigate this particular topic) I have chosen to examine this experiment as it applies to our daily lives. Rusting of metal occurs every day whether it’s the
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experiments is to be able to understand osmosis and its relationship to tonicity of solutions‚ and the transportation of molecules across cell membranes. It’s also used to understand‚ and how temperature affects diffusion. You also learn how to test for presences of starches and sugars in solutions. In the first exercise I will be testing for diffusion through an artificial membranes. This one has forty five steps to it. I will not go into it step by step but I’m going to say just the important
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purpose of this exercise is to learn aseptic technique procedures and there importance and also to learn to isolate colonies using the streak plate technique. Introduction Bacteria are inoculated (introduced) and cultured (grown) in the laboratory for test studies to determine their morphology (the shape‚ size‚ arrangement‚ and internal structures) and pathology (ability to cause disease). Inoculation has to be performed without adding other microbes or contaminants. Aseptic (sterile) technique is
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variable: color changes observed in tests Safety Always wear safety goggles and a lab coat when performing an experiment. Keep behavior in the lab purposeful. Use caution when working with dyes. They may stain your clothes or body. Check glassware such as test tubes and beakers for cracks and chips prior to use. Use the right gear‚ such as insulated gloves and test tube tongs‚ when moving test tubes into and out of the boiling water bath. When handling test samples otherwise‚ use thinner
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toxic if inhaled | Conduct experiment in fume cupboard | Gets rid of the fumes so it doesn’t get inhaled. | Equipment: * Dropper bottle of Cyclohexane | * Dropper bottle of Cyclohexene | * Bromine Water | * 4 Test Tubes | * Test tube rack | * Safety Glasses | * Gloves | * 1 pipette | * Fume cupboard | * 2 Dropper bottles labelled A and B‚ one containing a hexane and one containing a hexene | * Cork Stopper x4 | Method: NOTE:
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Introduction In this experiment‚ the gram negative bacterium Escherichia coli is being subjected to various environmental factors that affect the rate of growth. These factors scrutinized were the different types of nutrients‚ the intensity of aeration‚ or the temperature at which it was stored. The purpose of this lab is to determine which factor affects the Escherichia coli the greatest. It is known that these abiotic factors affect the rate of growth the greatest if they remain at the correct
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dependent variable (DV) is what is observed or measured as the IV changes. The DV is measured quantitatively and is the amount of beetroot pigment that leaks from the discs. ■ There are many controlled variables (CVs) or constants. They allow a fair test so that we can link the changes in the DV to changes in the IV more reliably. ■ There will be replication through three trials at each value of the IV. ■ There is a control in order to check that the procedure itself does not generate pigment. Not
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warmed up‚ use a clean small test tube from the drawer filled 2/3 with the first NaOH solution that is planned to use‚ as a blank set 0% and 100% transmittance. Take a %T reading every minute for at least 15 minutes so it may be convenient to wait until the room clock’s second hand approaches 12 before beginning the following procedure. Add one single drop of the crystal violet dye solution‚ invert to mix the contents of the test tube‚ and carefully place the tube into the instrument. When the
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