StudyBlue Flashcard Printing of Lab Final 2211L UGA http://www.studyblue.com/servlet/printFlashcardDeck?deckId=... In the distillation experiment, the purpose of a fractionating column was to Which liquid would be most easily separated from water by simple distillation? 1. 1-propanol (bp=97 degrees C) 2. 2-propanol (bp=82 degrees C) 3. tetrahydofuran (bp=65 degrees C) 4.
Helium is good for overhead, because it is lighter and thus flows upward. Argon allows easier arc starting and a smoother, more stable arc than helium does. Actually, argon pretty much is the most widely used shielding gas nowadays. TIG uses a tungsten electrode that is nonconsumable. In other words it does not burn up like an electrode in stick welding or the wire in metal inert gas (MIG) welding does.
Electrochemistry Homework Describe with the aid of labelled diagrams the structure and chemistry of a dry cell. Dry cells are electrochemical cells using a low-moisture electrolyte. They contain a centre of carbon rod, surrounded by an electrolyte paste and a zinc container. In the centre of most dry cells is a pure carbon rod (cathode) in the form of graphite. The carbon rod is surrounded by a layer of manganese dioxide (MnO2), and a thick paste of ammonium chloride (NH4Cl) and zinc chloride (ZnCl2), which serves as an electrolyte.
Neutrons, Protons and electrons are all sub-atomic particles. In relative mass, we always think of protons and neutrons in having a mass of 1 and electrons a mass of 1/1840, which shows that electrons are considerably smaller than protons and neutrons, and only make up a small part of the atom. The amount of protons and neutrons added together is the relative atomic mass, and this is the main structure of the atom. 2. The arrangement of particles in an atom Protons and neutrons make up the main, dense, central nucleus in the centre of the atom.
Fluorine April 6th, 2011 Fluorine is the most reactive chemical element and the lightest member of the halogen elements. Fluorine is a nonmetal and is part of group 17 (group VIIa) of the periodic table. Its density is 0.001696 grams per cubic centimeter. Its chemical activity can be attributed to its extreme ability to attract and to the small size of its atoms. Fluorine is a corrosive pale yellow gas.
Match each definition in Column A with the term in Column B. Column B 4 Understanding Main Ideas (Part A) CHAPTER Name 1. atomic number 65 Class Reviewing Vocabulary The Structure of the Atom CHAPTER Name Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. T168 Chemistry: Matter and Change Chapter Assessment Answer Key CHAPTER Name 4 Date CHAPTER ASSESSMENT Class of protons is 4 8. Isotope in which the difference between the neutrons and number 7. Chromium with two more neutrons than its number of
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.
This is the molecule which makes photosynthesis possible, by passing its energized electrons on to molecules which will manufacture sugars. All plants, algae, and cyanobacteria which photosynthesize contain chlorophyll "a". A second kind of chlorophyll is chlorophyll "b", which occurs only in “green algae” and in the plants. Bibliography: http://www.ucmp.berkeley.edu/glossary/gloss3/pigments.html Conclusion: I learned various things from this lab. For instance, I learned how pigments absorbed strongly move slowly and pigments absorbed weakly move the fastest.
It can also reacts with oxygen at high temperatures. Gadolinium has a hexagonal closely packed structure at ambient temperatures, but transforms at temperature of 1262 degree Celsius to a body centred cubic structure. This metal is paramagnetic at room temperature, but becomes ferromagnetic (strongly attracted by a magnet) when cooled below 20degrees Celsius and also shows the magnetoric effects ( meaning that when entering magnetic fields its temperature rises and its temperature decrease when exiting magnetic fields. Gadolinium has a greatest ability to capture thermal neutrons of all elements; and stable in dry air, but tarnishes off in moist environments forming gadolinium (III) oxide. It has a melting point of 1585K (which is the same as 1312°C 2394°F), heat of fusion of 10,05 kJ/mol, and boiling point of 3546 K( 3273 °C, 5923 °F).
It should consider energy consumption on all the life duration of the material. At this point, concrete energy is still only of 6.3 GJ/m3 compared to the 236 GJ/m3 of the steel (Penttala, 1997). Also, it is important to consider that steel strength is much higher than concrete one’s. In that case, energy consumption of reinforced concrete is of 0.47 GJ/m3 MPa and steel one’s is of 0.96 GJ/m3 MPa (Penttala, 1997). As sustainability of a material doesn’t depend only of its energy consumption, but also of the emissions released, concrete produces around 147 CO2 kg/t, and metals 3,000 CO2 kg/t (Penttala, 1997).