Naming Chemical Compounds General Information: Scientists all around the globe use a standard method for naming chemical compounds. The standards were set up by an international committee sponsored by the International Union of Pure and Applied Chemistry (IUPAC). Having this standard makes life easier for people who use these compounds everyday. It would be tough to set up any experiment if scientists everywhere used different names for the same compound. It would also make the lab a
Premium Chemistry Molecule Ion
producing a color similar to that of the original hydrate. A carbohydrate will give off water‚ but tends to char. The residue will also often be a caramel color. B. Reversibility 1. Gently heat a few crystals of about 0.3 grams of hydrated Cobalt(II) Chloride‚ CoCl2 x 6H2O in an evaporating dish until the color change appears to be complete 2. Dissolve the residue in the evaporating dish in a few cm3 of water from the wash bottle 3. Heat the residue to a boiling and carefully boil
Premium Management Marketing Strategic management
substance. What mass of water will be needed to make the solution? 5. What mass of lithium nitrate would have to be dissolved in 30.0 g of water in order to make an 18.0 % solution? 6. What mass of cobalt(II) chloride would be needed tin order to make 650.0 mL of a 4.0% cobalt (II) chloride solution? 7. A saline solution is 0.9% NaCl. What mass of NaCl and water would be required to prepare 50 L of this saline solution? 8. What mass of H2SO4 is contained in 60.00 mL of 5
Premium Ammonia Concentration Sodium
Chemistry 101 12-STANDARDIZATION OF SODIUM HYDROXIDE Standard solutions for titrations are especially pure mixtures with exactly known concentrations. Primary standards are very pure solids. They have the advantage that they can be weighed (the analytical balance is normally the most accurate instrument in the laboratory) and they are stable under laboratory conditions. In this experiment‚ the primary standard is oxalic acid dihydrate‚ H2C2O4 ( 2H2O. It will be used to standardize a
Premium Sodium hydroxide Titration Water
DOWNLOADED FROM WWW.STUDIESTODAY.COM DOWNLOADED FROM WWW.STUDIESTODAY.COM d – AND f – BLOCK ELEMENTS Electronic Configuration of Transition Metal/Ions The d-block element is called transition metal if it has partly filled d-orbitals in the ground state as well as in its oxidised state. The general electronic configuration of transition metal is (n–1) d1–10ns1–2. Exceptions in electronic configuration are due to (a) very little engery difference between (n–1) d and ns orbitals and (b) extra stability
Premium Periodic table Transition metal Electron configuration
upon the entrance slit of the monochromator. The monochromator separates the wavelengths of light and focuses each of them onto the photo detector sequentially. The absorption spectrum is determined to select the optimal wavelength for analyzing the cobalt (II) nitrate. The optimal wavelength for measuring absorbance is that wavelength that is most absorbed by the compound. The Beer’s Law Plot showed and differentiate the proportionality of the Concentration vs Absorbance graph and the Wavelength
Premium Electromagnetic radiation Electromagnetic spectrum
reasons for such conditions. II. Methodology A. Materials and Apparatus The chemical used in the experiment are as follows: HCl‚ sodium ions‚ ammonium carbonate‚ barium nitrate‚ acetic acid‚ potassium chromate‚ ammonium hydroxide and potassium oxalate. The apparatus used include spot plates/watch glass‚ nichrome wire‚ alcohol lamp‚ salt‚ water and stirring rod. B. Procedure We obtain a few crystals then each of the salts from the counter‚ and we place separately in the spot plate III. Results
Premium Chemistry Potassium Sodium
PERIODIC CLASSIFICATION OF ELEMENTS Introduction There are 115 elements that are known at present. Some elements have similar properties whereas some others have completely contrasting properties Scientists began to look for some pattern in the properties of these elements Dobereiner’s triads In 1817‚ Johann Wolfgang Dobereiner‚ a German chemist‚ classified elements into groups based on their properties. He kept all elements having similar properties in one group. Most of his groups had three
Premium Management Chemistry Oxygen
there was a misconception on whether or not a precipitate dissolved when excess 6M NaOH was added. If the precipitate did not actually dissolve then the logic tree would not lead towards zinc‚ but towards copper and cobalt. Then since the solution burned orange it would most likely be cobalt and not
Premium Chemistry Hydrogen Water
isomers‚ Trans isomers have a higher melting point compared to the Cis isomers‚ and Trans molecules are well packed than the Cis molecules. In this experiment‚ the cobalt (II) chloride hexahydrate is reacted with ethlenediamine (NH2CH2CH2NH2) to form [Co(en)2(H2O)2]Cl. Then hydrogen peroxide is added that changes the charge of cobalt from II to III. Finally‚ the HCl is added to the solution‚ that forms [Co(en)2Cl2]Cl. Trans isomer of [Co(en)2Cl2]Cl forms green color‚ and cis isomers of [Co(en)2Cl2]Cl
Premium Atom Electron Chemical bond