1.1 Boron History & Overview: Boron is an element of the periodic table belonging to the group 13. It is the only non metal present in its group. Boron has three valence electrons. It is capable of forming covalent bonds between atoms of similar nature to form polyhedral clusters. Boron has 2 stable isotopes in nature.
Neodymium is a chemical element with symbol Nd and atomic number 60. It is a soft silvery metal that tarnishes in air. Neodymium was discovered in 1885 by the Austrian chemist Carl Auer von Welsbach. It is present in significant quantities in the ore minerals monazite and bastnäsite. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use.
It is white spongy gelatinous substance which does not dissolve in water. It is found in the nature as the mineral hydrargilite and reacts with stong bases only under heating. The melting point of that compound is 300oC. Its density is 2.1 - 2.7 g/cm3. Aluminum hydroxide is amphoteric which means that it reacts easily both with strong acids and strong bases.
As mentioned in number 13, the data for the melting point makes sense because my pure product and given compound almost perfectly matched. 17. Again as explained in number 14, the TLC data made sense because my pure compound and 4-tert-butylbenzyl phenol had similar distances from the solvent origin of the plate. The presence of benzyl bromide and benzyl alcohol also explains how not all the product dissolved in the filtrate. The possible explanations and changes to make are similar to the previous questions.
Calcium is a chemical element on the periodic table with the symbol Ca with atomic number 20. Calcium is a soft- gray alkaline earth metal, fifth- most- abundant element by mass in the Earth’s crust. This element comes in the metal section on the periodic table. Sir Humphry Davy discovered this element in 1808. This element was discovered through electrolysis of a mixture of lime and mercuric oxide.
Magnesium is a chemical element with the symbol “Mg”. Magnesium is a shiny gray solid. The atomic number is 12 and it’s atomic mass is 24.305. Joseph Black a Scottish physician and chemist recognized magnesium as an element in 1755 but it was isolated by Sir Humphry Davy in 1808 (Periodic Table). High magnesium can be found in foods including nuts, fish, beans, avocados, yogurt, bananas, dried fruit, dark chocolate, and more.
The protons and neutrons together form the nucleus. Lithium has 3 protons and usually 4 neutrons since its atomic weight is 6.9 according to the periodic table. The atomic weight is 6.9 because most isotopes in natural Lithium (isotopes are defined as atoms with “the same number of protons but different number of neutrons” (1) ) have 4 neutrons and fewer have 3 neutrons. The atoms of the isotopes of Lithium behave almost exactly the same way when doing chemistry, since the atoms electrons only care about the charge of the nucleus. The arrangement of electrons in an atom is known as its electronic configuration.
Calcium's melting point is 842°C, 1548°F, 1115 K and boiling point is 1484°C, 2703°F, 1757 K. Calcium is a silver-white soft metal, that reacts to halogens, water, and acid. This metal was first discovered by a man called Humphry Davy, in 1808 through the process of electrolysis while doing a mixture of lime (CaO) and mercuric oxide (HgO). Calcium is one of the most abundant elements on earth, forming over 3% of the earth's crust. It has 6 stable and several radioactive isotopes Calcium is the third most abundant metal in the earth’s crust, but
I make up 27% Earth’s crust. Yet, first, I will talk about my origins (discovery). I was born in Switzerland in a solid state of matter at room temperature, by the reaction of potassium fluorosilicate with potassium to produce amorphous silicon. My father (the one who discovered me) was Jöns Jakob Berzelius in 1824. However, the man who named me silicon was Thomas Thomson.
No quick endospore stain was performed to validate this assumption since only one assigned organism was endospore forming and unlike Unknown #10, that organism was Gram positive. By Gram staining alone, it was safe to eliminate the three Gram positive bacteria that could have been assigned: S. epidermidis, M. luteus, and B. megaterium. The second step was to streak plate Unknown #10 to observe its macroscopic
Today, however, the penny consists of ninety-seven and a half percent zinc with only a thin copper skin. Copper holds the third spot in most consumed industrial metals, according to U.S Geological Survey. In fact, electrical wires, telecommunication cables and electronics make up three-quarters of copper. Besides gold, copper is the the only other element that is not naturally silver/grey. Today, about two thirds of copper comes from is found in volcanic rocks.
Around the 1760s, Barium Sulfate ( Bologna stone) became very well-known and was investigated by Carl Scheele. Suddenly, he realized it was sulfate of an unknown element. Meanwhile, mineralogist Dr. William Withering had found another heavy mineral in the Lead Mine in Cumberland, which was actually a lead ore. Naming the mineral Witherite, it was soon shown to be Barium Carbonate. 1808, Humphry Davy at the Royal Instiution in London was using the process of smelting with carbon, and produced the electrolysis of Barium Hydroxide. The physical properties of Barium are solid, pale yellow, shiny, and a malleable metal in room tempature.
My Citrate (CIT) result was turquoise so that meant the test was positive, and the Hydrogen Sulfide (H2S) had no black precipitate so it was negative. The Urea (URE) and Tryptophane Deaminase (TDA) results were both an orange color, which meant they were both negative. For Indole (IND), my result was yellow so it was negative. My result was colorless for the Voges Proskauer (VP) test so it was negative. The Gelatin (GEL) test result had no diffusion of pigment so that showed it was negative.