Also a very pale purple tint formed. Acid test: Added 2 mL of 1M NaOH- no Physical change was observed. Base test: Added 2 mL of .17M Acetic acid- No physical change observed. Table: Zinc (g) | Iodine (g) | Deionized water (mL) | Weight of boiling tube (g) | 1M NaOH(mL) | .17M Acetic acid (mL) | 2 | 2.01 | 5 | 40.73 | 2 | 2 | 2. Answer to focus question: Since it is amphoteric, it will act as an acid if reacts with base and act as a base when reacts with acid.
It is possible that fluorine can substitute for hydrogen in organic reactions. Fluorine has been known to form compounds with rare gases, including xenon, radon, and krypton. Free fluorine has a characteristic pungent odor, detectable at concentrations as low as 20 parts per billion. Both elemental fluorine and the fluoride ion are highly toxic. The recommended maximum allowable concentration for a daily 8-hour time-weighted exposure is 0.1 parts per million.
This is evident because the substance tested positive for both the acid test and the base test for zinc hydroxide. Observations of the zinc and iodine reaction without acetic acid: After swirling, the solution starts off to be yellow, than changes to orange. During swirling becomes dark brown- reddish. The tube feels warm, which means that the reaction is exothermic. Soon, the dark red changes into black and then eventually lighter and lighter becomes colorless.
It has a medium heat yeild and the burn difficulty is easy. It is hard to split. It produces light smoke and no spark. It produces 19.1 million btu's per cord. I found that cherry has a good rating for burning.
Intro to Chem, Professor Jara Styrene Styrene, also known as ethenylbenzene, vinylbenzene, and phenyllethene, is an organic compound with the chemical formula C6H5CH=CH2. This derivative of benzene is a colorless oily liquid that evaporates easily and had a sweet smell, although high concentrations confer a less pleasant odor. Styrene is the precursor to polystyrene and several copolymers. Approximately 25 million tons of styrene were produced in 2010. Styrene is most commonly produced by the catalytic dehydrogenation of ethylbenzene.
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.
pylori can be performed easily and rapidly. However, blood antibodies can persist for years after complete eradication of H. pylori with antibiotics. Therefore, blood antibody tests may be good for diagnosing infection, but they are not good for determining if antibiotics have successfully eradicated the bacterium. The urea breath test (UBT) is a safe, easy, and accurate test for the presence of H. pylori in the stomach. The breath test relies on the ability of H. pylori to break down the naturally occurring chemical, urea, into carbon dioxide which is absorbed from the stomach and eliminated from the body in the breath.
RESPIRATORY EFFECTS Dexmedetomidine is able to achieve its sedative, hypnotic and analgesic effects without causing any clinically relevant respiratory depression unlike opioids. The changes in ventilation appeared similar to those observed during natural sleep. Dexmedetomidine do not cause any changes in arterial oxygenation, pH and respiratory rate. (67) It also exhibited a hypercarbic arousal phenomenon, which has been described during normal sleep and is a safety feature. The obstructive respiratory pattern and irregular breathing seen with high doses of 1-2µg/kg given over 2 minutes and are probably related more to deep sedation and anatomical features of the patient and this could be easily overcome by insertion of an oral airway.
In cutaneous anthrax there is a 1 to 7 day of incubation period, a small papule appears at the site of inoculation. A papule is a small solid pimple or swelling that may form a rash and may typically be inflamed. It develops into a vesicle filled with clear fluid. Subsequently, a small ring surrounding of similar vesicles develops and fuses. This fusion turns into a large lesion causing erythema, which is superficial reddening of the skin, pruritis a severe itching of the skin and non pitting edema ( swelling in certain parts of the body) pain is rarely experienced.
INTRODUCTION Gadolinium is a shiny silvery white, malleable, ductile, metallic, rare earth element which is located in group 3, f-block, period 6 and classified in the series of lanthanides in the elements of periodic table and has 27 isotopes whose half-lives are known with mass numbers from 137 to 164. This element is considered a rare earth element because there is such a small amount of it, and it is not found often in its simplest form. It was discovered in 1880 by Jean Charles de Marignac where it was extracted in from the mine located in Ytterby in Sweden, but it was isolated from metal oxide in 1886 by Lecoc de Boisbaudran who named it after the Finnish Chemist Johan Gadolin who discovered the first rare earth element in 1794. Gadolinium