Procedure: Refer to Chemistry Lab Manual pp. 33-35, 37. Results: The density of the yeast-sugar solution on day 1 was 1.05g/mL. On day 2, the density of the solution had dropped down to 1.00g/mL. We found the mass of our pure alcohol to be 10.23g.
It commemorated his 100th birthday.The Lincoln penny was the first U.S. cent to include the words, “In God We Trust” from 1909-1958; the Lincoln coin’s flipside featured a wheat design. In 1959, the penny underwent another change. On the reverse side the wheat heads were replaced by the Lincoln Memorial (located in Washington, DC) engraved by Frank Gasbarro. In 1982, was the first year that copper was hardly used. The composition was changed from 95% copper and 5% zinc to 97.5% zinc and 2.5% copper -
7. How did Fahrenheit make thermometers smaller? Used mercury 9. What strange twist did Anders Celcius incorporate into his thermometers? He placed the his temperature scale at o degree for the boiling point, and ent downward and placed the freezing point at 100 degrees 10.
Ancient Atomic Warfare When the first atomic bomb exploded in New Mexico, the desert sand turned to fused green glass. This fact, according to the magazine Free World, has given certain archaeologists a turn. They have been digging in the ancient Euphrates Valley and have uncovered a layer of agrarian culture 8,000 years old, and a layer of herdsman culture much older, and a still older caveman culture. Recently, they reached another layer of fused green glass. It is well known that atomic detonations on or above a sandy desert will melt the silicon in the sand and turn the surface of the Earth into a sheet of glass.
In well A2: Place 10 drops of Magnesium Sulfate, MgSO4 c. In well A3: Place 10 drops of Zinc Nitrate, Zn(NO3)2 d. In well A4: Place 10 drops of Iron (III) Chloride, FeCl3 e. In well A5: Place 10 drops of Copper (II) Sulfate, CuSO4 3. Take the metal solids from your LabPaq; there should be one piece each of magnesium, zinc, and iron plus two pieces of lead. NOTE: Magnesium and lead oxidize very easily and an almost invisible oxidation layer may coat the metal. To insure good reactions you should scrape the surface of those metals with a pocketknife or remove the oxidation layer by rubbing the metal pieces with steel wool or something similar. Evidence that a reaction is taking place is the formation of bubbles or a coating on the metal immersed into the solution.
The recommended maximum allowable concentration for a daily 8-hour time-weighted exposure is 0.1 parts per million. The fluorine-containing mineral fluorspar (or fluorite) was described in 1529 by the German physician and mineralogist Georgius Agricola. It appears likely an unknown English glassworker first prepared the crude hydrofluoric acid in 1720. In 1771 the Swedish chemist Carl Wilhelm Scheele obtained hydrofluoric acid in an impure state by heating fluorspar with concentrated sulfuric acid in a glass retort, which was greatly corroded by the product; as a result, vessels made of metal were used in subsequent experiments with the substance. The nearly anhydrous acid was prepared in 1809, and two years later the French physicist André-Marie Ampère suggested that it was a compound of hydrogen with an unknown element, analogous to chlorine, for which he suggested the name
Styrene is most commonly produced by the catalytic dehydrogenation of ethylbenzene. Styrene is regarded as a “hazardous chemical”, especially in case of eye contact, but also in case of skin contact, of ingestion and of inhalation, according to several sources. Styrene is largely metabolized into styrene oxide in humans, resulting from oxidation by cytochrome. Styrene oxide is considered toxic, mutagenic, and possibly carcinogenic. Styrene oxide is subsequently hydrolyzed into styrene glycol by the enzyme epoxide hydrolase.
Fracking also created huge natural losses such as it crates pollution, destruction of forests to create its pipe lines. The pipe lines they use are also not long lasting as there is gas vapors in water because of leakage in pipe lines. From every twenty pipe lines, one is leaking that increases pollution. Gas burners used to store natural gas creates noise pollution more than a jet engine. It also have connection to increasing sexual diseases.
A few of these chemicals are cadium, a highly poisonous metal that is also used to make batteries, formaldehyde which is used to preserve dead bodies, and lead which is a highly toxic metal. Some studies say that the nicotine in cigarettes is as addictive as cocaine and heroin, which leads to the theory of why it is so hard for addicts to stop. With all these deadly chemicals, why would someone even think of smoking cigarettes? These 4,000 deadly chemicals are more than enough evidence to make cigarettes illegal in Canada. Cigarettes are bad for anyone who smokes them.
They are infused with many chemicals and stimulants that are destructive to our bodies. Tar, carbon monoxide, nitrosamines, aldehydes, polycyclic aromatic hydrocarbons (PAH's), and nicotine. Nitrosamines are seen as the most deadly cancer-causing agent in tobacco. Nicotine is highly addictive. Over the past few decades or so, the major cigarette companies have pursued a safer cigarette but have not gotten very far.