In a group they have the same number of valence electrons. Now examine the periodic table and the properties of elements in more detail. Use the periodic table web sites to explore the similarities and differences between elements. 15. Elements within the periodic table are often grouped into categories.
CH 341 – Laboratory Techniques in Inorganic Chemistry Experiment 1: Identification of Stereochemical (Geometrical) Isomers of [Mo(CO)4(L)2] by Infra-Red Spectroscopy Abstract Purpose of this experiment is to prepareone isomer of molybdenum carbonyl complex, [Mo(CO)4(pip)2], and both possible isomers of [Mo(CO)4(PPH3)2] using convenient literature method. Examining the CO stretching region of the IR spectra, the isomers will be identified. Introduction Metal carbonyl considers as one of the most important class of organometallic compounds and many studies of their chemistry and their bonding characteristics has been done (2). Metal carbonyls were first considered as laboratory interests, but soon achieved huge industrial applications (6). The technique of infrared spectroscopy, in both the solid and solution phases, has proved to be of very useful in these studies.
0.00079 moles EDTA4- c. 0.00079 moles ZnI2 d. 0.0517 grams of ZnI2 are in the sample e. 0.0517/0.237= 21.8% f. Error Is 6.34% Lab Report: Part 1: In this lab we used the following supplies: * Zinc Iodide * Na2H2EDTA(s) * Calmagite indicator solution * pH 10 buffer solution * 6M Acetic Acid * Unknown Zinc Compound The main purpose for this part of the lab was to determine the amount of zinc ion in a sample of ZnI2 by titration. The two types of zinc: * Zinc iodide made by zinc and iodine * Commercially purchased zinc iodide (the
Water samples from the Clark Fork have been taken and will be tested using both absorption and emissions spectroscopy in order to check the levels of group IA and IIA metal ions. When electrons in an element are excited energy is released that can be measured as light. Each element releases different levels of energy that are observed as different wavelengths of light. With the proper equations (E=hv and E=hc/⋋), emission spectroscopy can be used to find the wavelength and frequency of light emitted by the excited electrons. This will help determine the types of ions present in the water sample.
Metal Name Mass of Metal Volume of water Initial temp. in calorimeter Initial temp. in beaker Final temp. of mixture Aluminum 34.720g 26.0mL 25.4°C 100.6°C 41.6°C Part II: Insert a complete data table, including appropriate significant figures and units, in the space below. Also include any observations that you made over the course of part II.
Record several points of pH and NaOH added (especially near equivalence point) to be use later to prepare a titration curve. Observations and Results Part I: Solution | pH | 0.1 M HCl | .70 | 0.1 M NaOH | 13.30 | Part II: Volume of 0.1 M NaOH at equivalence point: 35mL pH at equivalence point: 11.45 Molarity of the Unknown Acid A (HCl): 2.0 x 10-4 Discussion In this lab, we found out that water self ionizes itself into hydrogen ion and hydroxide ion naturally to a very small extent. An indicator, in an acid base reaction, is a substance whose color changes over a particular pH range. Phenolphthalein is an example of an indicator which changes from colorless to pink as pH goes from 8 to 10. We plotted the pH against the amount of base added producing a
Finding the Ratio of Moles of Reactants in a Chemical Reaction I. Purpose The purpose of the lab is to be able to find the ratio of mole reactants in the chemical reaction. The lab uses the method of continuous variations in order to determine the mole ration of two reactants. The chemicals that were used in the lab where sodium hypochlorite (NaClO), and sodium thiosulfate (Na2S2O3). II.
EXPERIMENTAL DETERMINATION OF AVAGADRO NUMBER Purpose The objective is to make an experimental measurement of Avogadro's number. Introduction A mole can be defined as the gram formula mass of a substance or the atomic mass of an element in grams. In this experiment, electron flow (amperage or current) and time are measured in order to obtain the number of electrons passing through the electrochemical cell. The number of atoms in a weighed sample is related to electron flow to calculate Avogadro's number. In this electrolytic cell both electrodes are copper and the electrolyte is 0.5 M H2SO4.
Synthesis and Study of Colloidal Silver _______________________________________________________________________ Purpose: Colloidal silver is synthesized and its visible spectrum used to find the size of the silver nanoparticles. Aggregation upon addition of salt is observed. A polymer is added to stabilize the colloidal silver. Background: Nanotechnology deals with processes that take place on the nanometer scale, that is, from approximately 1 to 100 nm. Properties of metal nanoparticles are different from those of bulk materials made from the same atoms.
Methodology A survey was employed to find out the attitude towards chemistry and its prediction on achievement in chemistry. The attitude was measured using two scales of measurement namely Likert and Guttman. The selected topics in chemistry were periodic table (PT); chemical bonding (CB) and organic chemistry (OC).