Analytical chemistry

Surface Runoff Introduction In the experiment taken place a group of three to four of use wanted to test the effects of what multiple chemicals had on Lemna minor. This is also known as duckweed. The chemicals we tested all are harmful, as they do not treat the life cycle of these plants well being in their water. What is Lemna Minor you may ask well stated above it is also known as duckweed but more information helps you know that it is found in ponds and it grows at a rapid rate according…

Our experiment was centered on taking four testing groups and setting a baseline level of dehydration across all four groups. From there each group would be assigned water, coke, Gatorade or remain dehydrated. The test subjects would then consume their assigned drinks based on their body weight. Urine would then be collected at thirty-minute time intervals to measure urine changes. The goal of our experiment was to determine the influence of fluids being introduced into the body of various…

Introduction Actual rocket ships use chemical reactions to lift off into space. Using baking soda and vinegar we can simulate a rocket taking off because when mixed together, a chemical reaction occurs. By changing the amounts of the chemicals we can determine which will allow the bottle rocket to go farther. Chemical Reaction Vinegar is an acetic acid. When an acetic acid and baking soda (sodium bicarbonate) are mixed together, three new chemicals are formed, Water (H2O), carbon dioxide (co2),…

5-CinthiaV-Selenium The name of my element is Selenium. The element symbol is “Se”. Selenium was discovered in Sweden by Jons Jacob Berzelius in 1817. Selenium is an origin for a greek word meaning moon. Selenium has four energy levels. In the first energy level, it has two electrons. The second energy level has eight electrons. The third energy level has 18 electrons. The fourth energy level has six valence electrons. Selenium has forty-five neutrons. Selenium has the…

Cellular Death: Tonicity on Potato Cells Introduction The purpose of this experiment was to test the effects of tonicity on potato cells. During this experiment slices of a potato were placed into beakers containing salt solutions with different concentrations. How will the percentage of salt concentration in solution affect a plant cells water content? This experiment will determine which salt solution concentrate will cause the potato cells to absorb water or lose water. Tonicity in…

Chemistry Honors Mrs. Moreno Period 5 INTERPRETING THE PERIODIC TABLE Partner’s name: Faranak Hajikhan, Pablo Moncada, Albina Contreras and Karla Santos Title: Interpreting the Periodic Table Date: 12-18-14 Subject: Honors Chemistry / Period 5 Introduction: The periodic table is a table of the chemical elements in which the elements are arranged by order of a atomic number. The periodic table also has a special name for its vertical columns. Each…

Trayc Poppenhager May 5, 2015 TA: GK Chem 341 Thermodynamics and Kinetic Control Goal: The overall goal of this experiment was to learn and observe about kinetic and thermodynamic control of different reactions by noticing which product forms faster or slower and possibly which reaction is more stable than the rest of the reactions. Significance: Organic chemists find using kinetic and thermodynamic control useful because they use the concept of the reactions to figure out…

Introduction Four reactions were done using coffee cup calorimetry for each. Two Styrofoam cups were stacked together for each reaction performed, with a piece of cardboard used as lid with a hole for the thermometer. The beginning and final temperatures were taken for all reactions and solvents used. The end result and point of the experiment is to find what ΔH. Also this is a constant pressure calorimetry experiment. The goal of each of the reactions is to get ΔHrxn which is represented in…

After letting the potatoes sit for a few days. The potato in the freshwater solution was soft and sticky, it could be easily squished it also had a bad scent because the potato had gone bad. However, the potato in the saltwater solution was firm and had become more narrow than before, it did not have a scent like the freshwater potato did. The solution that caused the potato to change the most in circumference and mass, was the saltwater solution. In the data table the potato in the fresh water…

To demonstrate their effectiveness in creating new carbon to carbon bonds, the Grignard arylation of 2-butanone was carried out. The Grignard reaction of phenyl bromide and magnesium, followed by the addition of 2- butanone yielded a crude product of 2-phenyl-2-butanol. The 1H NMR spectra was taken before distillation, showing the crude product, as well as after distillation, showing one of greater purity. In addition, an IR spectrum was taken after distillation. Both the 1H NMR and IR spectra…