Melting Point Solubility Lab Report

However, it dissolved in non-polar solvent toluene and slightly in ethanol, which means naphthalene is non-polar. It has high resistivity in aqueous solution and solid form, and respective melting point. The sample was given as solid with large shiny white crystals. Silicon carbide was classified in this experiment as macromolecular structure. This compound was insoluble at any type of solvent both polar and non-polar.

However, Phosphorus is soluble in Phosphorus Disulfide and is not able to rust. Not only do they differ at these properties, but they also have different atomic radii, electronegativity, and electron configuration. On one hand, Titanium’s atomic radius, or the size of its atom is 215 pm. Its electronegativity, or the “... measure of the tendency of an atom to attract a bonding pair of electrons,” (Clark Jim, 2013), is 1.54. Titanium’s electron configuration, or as written in Lenntech.com, is a description of the arrangement of electrons in circles around the core, is [Ar] 3d2 4s2.

Copper is an element and a mineral important to our everyday lives. Because copper is stable, it can be used in jewelry, coins, wiring, and statues. It’s one of the well-known metals due to its reddish brown metallic color. Because copper has high ductility, malleability, thermal and electrical conductivity, and resistance to corrosion, it is a major industrial metal. Copper is one of the oldest metals, dating back more than 10,000 years ago.

  If an aqueous solution of one such salt is acidified with a strong mineral acid, the much weaker organic acid is produced. Weak organic acid is largely un-ionized in the aqueous solution. No change is observed when the reaction is carried out because the solutions of the starting materials and the products are colorless.   The organic acid is soluble in water and thus, does not separate.

The purpose of this lab is to observe the reaction between hydrochloric acid and magnesium metal. When the substances are reacted over water, the products produced are a salt in aqueous solution and a gas. While the salt remains in the water as part of a solution, the gas produced will float to the top. Though water vapor pressure will affect the pressure of the gas in the eudiometer, it is possible to apply Dalton’s law of partial pursues to find the dry pressure of the gas. When the dry pressure is determined, the volume of the gas at STP can then be determined and what the experimental volume of one mole of the gas would be at STP.

2K + 2H2¬O ----- 2KOH + H2 LIMITATION Potassium was not used for the experiment because it was not available in the laboratory and is highly explosive as compared to the other two Alkali

This results in elements combining together to create a molecule, with subscripts (if necessary). Lastly, particles are referred as formula units. (ionically bonded- metal to nonmetal). Labelling them include pairing a metal element to a nonmetal. This will result in elements names combining together.

1. Introduction Epoxides (or oxiranes) are highly versatile intermediates in synthetic organic chemistry. Nature also uses them as intermediates in many key biosynthetic pathways. However, there are other functions of epoxides in biological systems. They can impart localised structural rigidity, confer cytotoxicity by alkylation, or be secondary metabolites [1].

1. Magnesium is an alkaline earth metal with an atomic number of 12 and an atomic mass of 24.305. It is part of the second group of elements on the periodic table located on the far left side of the periodic table. *CAUTION* Magnesium is a flammable metal!

No carotid bruits, pulse =

A net ionic equation shows only the species that actually take part in the reaction. In solution, Na2S dissociates into Na and S2 ions and ZnCl2 dissociates into Zn2 and Cl ions. As per our lab, zinc ions (Zn 2) and sulfide ions (S2) formed an insoluble compound, zinc sulfide (ZnS), while the other product, NaCl, was soluble and remains in solution. This reaction is called a precipitation reaction. The balanced molecular equation is: Na2S(aq) + ZnCl2(aq) =

2 electrons are required to fill the first energy level (or shell) of any given atom, but 8 are required to fill all the levels thereafter (in most of the elements that make up the living world). A. Chemical Bonding in One Instance: Water 1. Covalent bond is a chemical bond in which atoms share a pair of electrons 2. The law of conservation of mass states that the matter is not created or destroyed in a chemical reaction B. What is Molecule 1. Molecule is an entity consisting of a defined number of atoms covalently bonded together

Electrons are a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids. Inside the dense nucleus, are protons and neutrons (Doc. 2). Protons are a stable subatomic particle with a positive charge that is the opposite of an electron and occurs in all atomic nuclei. Lastly is the neutron. It is a stable subatomic particle that has no charge and has nearly the same amount of mass as a proton.

The solubility rules pertaining to the substances used during this lab are as follows: All nitrates, sulfates (except those containing Ba, Ca, Sr, Pb, and Hg₂), compounds containing alkali metals (Na), and chlorides (except those containing Ag, Pb, and Hg₂) are soluble. All compounds containing CO₃, the compound AgCl and some sulfates such as Ag₂SO₄ are insoluble. Given this, the reaction between Silver Nitrate and Hydrochloric produced aqueous nitric acid and a solid precipitate of Silver Chloride because of AgCl insolubility and all nitrates solubility. Silver Nitrate and Copper Sulfate produced aqueous Copper (II) Nitrate and a solid precipitate of Silver Sulfate because of all nitrates solubility and the exception that Ag₂SO₄ is insoluble. Silver Nitrate and Sodium Carbonate reaction resulted in the formation of a solid Silver Carbonate precipitate and aqueous Sodium Nitrate because of all nitrates solubility and carbonates insolubility.

Therefore, electrons do not affect the mass number. When an atom is neutral, it contains the same number of protons and electrons. Thus, a neutral Copper atom has 29 electrons. Since electrons are constantly moving around the nucleus, their exact position is impossible to calculate. Based on electron configurations, one is able to determine the probable locations of electrons in a series of levels called energy levels.