A circumstance without any of the evidences present concludes that a chemical reaction has not occurred and thus a displacement reaction has not taken place. Figure 1 Figure 1 chlorine + sodium iodide iodine + sodium chloride (non-metal) (compound) (non-metal) (compound) Cl2 + 2 NaI I2 + 2 NaCl Figure 2 Figure 3 Figure 3 (Source of Figure 3: http://vinstan.wikispaces.com/Chapter+3+++++Chemical+Reactions) Purpose: The main objective of Activity Series of Metals is to determine the reactivity of common metals. For this lab we should be able to find out and predict the products that come from a
The main purpose of this lab experiment was to determine if certain senses affect reflex ability. To test this, you must isolate the senses sight, sound, and touch. First we started off with a concept text by dropping a dollar and seeing how long it takes for someone to react. It was a bit tricky because the dollar was not very long, so there wasn’t much time to react before it would become out of reach. In my group were Valerie, Shaya, and I.
It was also stated by Professor Bob Prior that “it is possible for salt to hurt an enzyme due to the fact that salt can change the polarity of certain parts of an enzyme.” Over time, salt tends to denature certain enzymes, making them less efficient catalysts. This is one of the key reasons that our hypothesis states tha salt will cause the enzyme to be less effectual. Our lab group felt compelled to find an answer. We used Morton's Sea Salt in our experiment because the Morton Company has been in the salt business for over 160 years. They have a very informative website in which we were able to resource valuable information on the differences of sea and table salt (Mortonsalt.com).
The reactions are different because ethanoic acid has weaker attractions and gives away the electron in its outer shell easier. We didn't have time to see the volume of hydrogen being the same. Evaluation I believe that the precision of our measurements of acid could've been better. Using glass beakers with a higher resolution would allow us to correctly measure the amount of acid we would be reacting. Also, we lacked precision in timing, and should've used a more precise stopwatch to make sure it was a fair test.
It was called the Daguerreotype. It was advertised as "requires no knowledge of drawing...." and that "anyone may succeed.... and perform as well as the author of the invention" This lead to a craze, but not all people welcomed the invention, the artists in particular feared a threat to their livelihoods. The Calotype process invented by William Henry Fox Talbot was the next step. This was on paper. “Several experimented with glass as a basis for negatives, but the problem was to make the silver solution stick to the shiny surface of the glass.” “In 1848 Abel Niépce de Saint-Victor, perfected a process of coating a glass plate with white of egg sensitised with potassium iodide, and washed with an acid solution of silver nitrate.” This produced very fine detail and much higher quality.
Hydrometallurgy to Analyze a Chromite Sample : Chromium can be used in the production of stainless steel and other nonferrous alloys in order to enhance their harden ability and to make the alloys more resistant to corrosion and oxidation. It can also be used to plate metals, make pigments, process leather, catalyze, and treat surfaces. Chromite is the only ore of chromium. Chromite is iron magnesium chromium oxide. Metallurgy can be used in order to recover the chromium from the chromite ore.
Chemistry Design Lab Kim Li Feb 20th,11 Investigating the effect of different concentration of nitric acid on the its drop volume DESIGN Introduction: Intermolecular forces are forces that hold molecules together. They play important roles in determining the properties of a substance, properties such as boiling point, volatility, viscosity, miscibility, and electrical conductivity. [6] Examples of intermolecular forces include Van der Waals forces, dipole-dipole forces, and hydrogen bonding. Van der Waals forces are temporary dipole all species can form due to uneven distribution of electrons. Dipole-dipole forces are permanent dipoles due to different electronegativity.
Physics Lab Report Lab 3: Energy and Momentum Group and name Abstract: In our experiment, we were trying to find the energy loss due to semi elastic collision and friction. Also we found the efficiency of the collision using certain equations. We found out that the loss of energy due to semi elastic collision is a lot more than the loss of friction. We had many external errors with measuring because of our inaccurate source of measuring system. The materials we used were 6 steel ball bearings, a U-track, meter stick, and triple beam balance.
Practical 5 – Heavy Metals by Absorption Spectrometry Contents Aim - 1 Introduction 1 Procedure 2 Pre-laboratory exercises 2 Results and discussion 3 Conclusion 3 References 3 Aim – The aim of this practical is to determine the concentrations of each of Cu, Pb and Cd in an unknown solution with the use of Atomic Absorption Spectrometry. Introduction Atomic Absorption Spectrometry or ‘AAS’ is a spectrophotometric analysis technique that allows for both quantitative and qualitative determination of most elements. Each elemental metal absorbs ultraviolet light at a specific wavelength when excited by heat; this is the basis of atomic absorption spectrometry The procedure involves passing known concentrations of the element in solution through a nebulizer forming a mist. This mist is then aspirated into a flame forming gaseous atoms, elementary ions and molecular species. A focused beam of ultraviolet light at a specific wavelength is directed at the sample, reduction in the intensity of the light is then measured and converted to absorbance.
It also does not produce gaseous emissions like greenhouse gases, and is usually small in quantity and can be easily confined so that it doesn’t affect those around it (Zehner, 2012). There is however several disadvantages of nuclear power that does include disposal issues, although not affecting the ecosystem. The fuel rods that are disposed of will stay radioactive for hundreds if not even thousands of years. In saying this, the fuel rods must be disposed of in a secure waste disposal facility. When people hear this, the first reaction is usually a horrific one.