Bonding Formal Lab Introduction (with Background information): Any substance, whether it is a metal or nonmetal, people can determine it by seeing if it is shiny, soft, or reactive. Metals are shiny, reactive, and have high melting points, while nonmetals are soft, have low melting points and not very reactive, and that is how anyone can determine whether a substance is a metal or a nonmetal. Covalent bonding is when two atoms share electrons, but it only occurs in two nonmetals only. They have low melting points and they are not soluble. Although, Ionic bonding is when an atom gives away elections to another atom, which only happens in a metal and a nonmetal, and they have high melting points and are soluble.
4) When naming an ionic compound, which ion is given first? The metal ion is named first 5) Give explanations for the following: a. Argon will not react with any other element It already has a complete number of eight, a full number in its valance shell so it cannot react with itself or another element b. The reaction between sodium chloride gives out a lot of heat and light. The chemical energy of the product is less then the chemical energy of the reactants. This energy is indestructible and is converted to light and heat.
Seventy five percent of the table is made up of metals, and a couple of the columns on the right of the table have gases. There are only two elements that are liquids- mercury and bromine. Column 1 contains the alkali metals, which suddenly combust when exposed to air or water. Columns 3-12 are the transition metals, which contain heavier atoms, which are more flexible in how they organize their electrons. Column 17 is made up of the more reactive gases- the halogens.
Indirect Gravimetric Determination of a Hydrated Compound in a Mixture Morgan Dufer I. The purpose of this lab was to find the percent of BaCl2*2H2O in a sample of unknown composition by using gravimetric analysis. II. Pre-lab Questions 1. What mass of MgCO3 is contained in a 2.750g solid sample consisting of only MgCO3 and MgO if heating to decompose all the MgCO3 according to the following equation leaves a solid residue weighing 2.160g?
Zinc ion and Iodine-iodide-triodide ion in water: It was a liquid solution in a bottle, it was very dark orange-brown color. Solid Zinc Iodide: A very white powdery substance that had several clumps within it. It was also very dry in nature. Mass Table Substance Amount of Mass Measured for Actual Mass Granular Zinc 2.0 grams 1.9 grams Iodine Crystals 2.0 grams 2.1 grams Observation of Reaction Shown below and Included within the lab notes on pages 12 and on page 14. Placing Acetic Acid in Zinc and Iodine test tube After placing the Acetic Acid in a normally unreactive test tube containing Zinc and Iodine, the solution changed to a more orange and then to a more red-brown color.
Large desert areas strewn with mysterious globules of "glass"—known as tektites--are occasionally discussed in geological literature. These blobs of "hardened glass" (glass is a liquid, in fact) are thought to come from meteorite impacts in most instances, but the evidence shows that in many cases there is no impact crater. Another explanation is that tektites have a terrestrial explanation-- one that includes atomic war or high-tech weapons capable of melting sand. The tektite debate was summed up in an article entitled "The Tektite Problem", by John O'Keefe, published in the August 1978 edition of Scientific American. Said O'Keefe: If tektites are terrestrial, it means that some process exists by which soil or common rocks can be converted in an instant into homogeneous, water-free, bubble-free glass and be propelled thousands of miles above the atmosphere.
high melting point, hard, brittle, slightly soluble in water, conductor of electricity when melted or in solution Molecular solid - crystalline solid that has molecules arranged in a particular configuration. low melting point, generally insoluble in water, nonconductor of electricity. Metallic solid - crystalline solid that has atoms of metals arranged in a definite pattern. low to high melting point, malleable, ductile, conductor of electricity, insoluble in most solvents. Lesson 13.6 Changes of physical state: * necessary to draw a temperature-energy graph to see the change in temperature with a constant application of heat Heat of fusion - the amount of heat required to melt 1.00 g of substance.
Mariam Choudhery 11/19/10 P 2 Understanding the Mole Lab Substance | Volume of one mole or (mL or cm3) | Mass of empty beaker (if applicable) | Mass of one mole of substance + beaker (g) | Mass of one mole of substance (g) | Smallest unit of the substance? (atom or compound) | Column :7 | % Error of (molar mass) | SucroseC12 H22O11 | 450mL | 223 | 570.0 | 347g | Compound | .80 | 1.361% | Carbon (C) | 10.8cm3 | N/A | N/A | 10.9g | Atoms | 1.40 | 9.242% | Tin (Sn) | 20 mL | 31.2g | 115.9g | 84.7g | Atoms | 3.81 | 28.65% | Zinc (Zn) | 15mL | 31.2g | 81.90g | 50.7g | Atoms | 5.359 | 22.47% | Aluminum (Al) | 20mL | 31.2g | 55.31g | 24.11g | Atoms | 2.6 | 10.64%/ | Copper (Cu) | 11mL | 31.2g | 95.0g | 63.8g | Atoms | 1.22 | -0.393% |
Low density polyethylene (LDPE) – involves an older gas phase process (still used) with conditions: high pressure (1000-3000 times atmospheric), high temperature (300°C) and an initiator (an organic peroxide e.g. dibutyl peroxide, or oxygen). The resultant product has significant chain branching due to alkyl groups replacing hydrogen atoms on some carbon atoms. Consequently, the alkane chains cannot pack together in an orderly fashion, resulting in low densities and weak dispersion forces; therefore LDPE is soft, flexible and has a low melting point. The initiator isn’t strictly a catalyst as it is involved in the actual formation (one initiator molecule per ½ polymer molecule).
Focus Questions: 1) What happens Qualitatively on both the Macroscopic and Atomic levels when zinc, Iodine and Acidified Water are mixed? Does a Reaction Occur? On the Macroscopic Levels, there is no reaction. However, when Zinc and Iodine and Water are mixed together a color is formed in the solution and a release of heat occurs, an exothermic reaction. The color starts out as a reddish brown color, and then, when swirled, becomes a gold yellowish color, and slowly becomes transparent clear at the end of the reaction.