Photographic chemicals

The purpose of these calculations is to identify the limiting reagent and calculate the percent yield of the esterification reaction used to produce aspirin. This reaction was catalyzed by concentrated H2SO4, but since it is not consumed during the reaction, it does not affect the stoichiometric calculations. In order to determine the limiting reagent, the moles of reactants were calculated (Part A). Part B of the calculations illustrates the amount of aspirin produced by each reactant based on…

certain chemical reactions to take place much quicker than reactions would occur on their own. Enzymes function as catalyst, which means they speed up reactions by providing an alternative reaction pathway of lower activation energy (cite). Each step of a pathway typically requires a specific enzyme, without the specific enzyme, the pathway can not be completed. In addition, enzymes do not undergo permanent reactions and remain unchanged by the end of the reaction. Enzymes catalyze chemical…

salt to be separated from the sand. Page 52 20. Compounds can be broken down into simpler substances while elements cannot. 21. The composition of a substance is always fixed, but the composition of a mixture can vary. 22. Chemical symbols are used to represent elements and chemical formulas are used to represent compounds. 23. Electrolysis, or the passing of an electric current through a substance, can break down a compound into simpler…

Sir William Ramsay and Morris Travers founded neon in 1898, by experimenting on liquid air. Prior to discovering neon they had recently found krypton, then later on they would go to discover xenon. “ Ramsay knew that sometimes one element could stay hidden behind another element (Stewart www.chemicool.com/elements/neon.html).” Neon was actually named by Ramsay’s son and was named neon after greek words neos (which means new). After Ramsay and Travers were able to keep finding neon it opened…

This lab was conducted to find the key differences between the quantity of heat (q) and ∆H of a substance. Different masses of substances CaCl2 and NH4NO3 were dissolved in water to see how changing mass impacts the q and ∆H of a substance. When the two substances dissolve, they become ions. CaCl2 dissolves in a reaction of: CaCl2 Ca2+aq + 2Cl1-aq while NH4NO3 dissolve in a reaction of: NH4NO3 NH41+aq + NO31-aq . As shown in these reactions, when ionic compounds dissolve in water, they break…

these can be transferred to or shared with another atom. Valence electrons are important because they are the ones that determine the effect in a chemical reaction. Valence electrons also help determine where specific elements are located in…

The purpose of the whole lab is to use my knowledge of the periodic table to determine the identity and physical properties of each unknown element. To find the unknown elements we looked at the characteristics of the other elements and grouped the ones that were similar and belonged in the same column. By looking at the characteristics of the unknown elements if it seemed to belong in a group with others with a blank we assumed it belonged there. Mendeleev was a scientist who came up with the…

Goals The goal of the lab was to investigate the properties and structure of an unidentified compound that was discovered in a local landfill. The group was called in to help determine the chemical and physical properties of the compound so we can let the people of the town know so it can be taken care of properly with or without further precautions to be taken. Another goal of this project was to devise the synthesis of the unknown compound. Experimental Design In order to determine the…

The purpose of this lab is to understand how the elements in similar groups are together because of similar properties the elements share. Like Mendeleev, we had made connections toward the creation of the periodic table. When finding the unknown elements we used other known elements as guides and looked for similar properties. Like the Periodic Table today, it is organized through similar properties of each element and categorized in groups. Dimitri Mendeleev was a chemist from Russia who lived…

that atoms are indivisible and indestructible. He also theorized that atoms of an element are identical in properties and mass. Dalton stated that compounds are formed by combining two or more different types of atoms. Lastly, Dalton said that a chemical reaction is the rearrangement of atoms.…