Molar

Whether we notice it or not, chemistry lives in our bodies. Things such as skin conditions, digestion, breathing, and hair growth all deal with chemistry in their own way. They all have certain chemical reactions and chemical changes that affect the way our bodies work. Even though we study different curriculums during chemistry such as the chemical equations, chemical reactions, and other things we have learned go far beyond what is said in class. During food digestion there are…

Tyler White CHEM151LL 13851 07/18/2017 Mole to Mole relationship and Empirical formula of a Hydrate Purpose: The purpose of this lab experiment is to determine the molar ratio between substances, and to write chemical equations. The second experiment is to determine the ratio of water in copper, and magnesium, which is obtained through burning the vapor using the Bunsen burner. Materials: Because the experiments were conducted online there wasn’t any use of materials, only digital ones, for…

Results: Table: Mass of alcohols combusted along with experimental and literary values for enthalpy change Alcohol Molar Mass (g/mol) Mass of Alcohol Combusted (g) Enthalpy (kJ/mol) Enthalpy literature value [Stretton n.d.] (kJ/mol) Trial 1 Trial 2 Trial 3 Average (mean) Trial 1 Trial 2 Trial 3 Average (mean) Ethanol 46.07 1.447 1.327 1.371 1.382 -133.1 -145.1 -140.5 -139.3 -1367 Propanol 60.10 1.133 1.375 1.255 1.254 -221.7 -182.7 -200.2 -200.3 -2021 Butanol 74.12 1.181 1.046 1.119 1.115…

The mass lost from decomposition would be assumed to be mass of water that evaporated from the sample. This could potentially alter the proportions for the hydrate formula, as the aluminum sulfide to water molar ratio would be incorrect. d. Some water reabsorbed into the salt after heating. As stated in answer a, if water reabsorbs back into the salt after heating, the mass recorded would not be representative of the mass of just the salt. Also, the water…

degrees celsius and the mixture of Biphenyl and Cyclohexane was 2.07 degrees celsius. Introduction The purpose of this experiment is to determine the freezing point for pure cyclohexane and a solution of biphenyl and cyclohexane. Calculating the molar masses and then comparing it to the accepted value. The equation ΔTf = Kf * m will be used to solve for the molality after a massed amount of solute is associated into a solvent, in which the difference…

Dental prophylaxis is a procedure performed to clean the teeth. It’s important to have your dog or horse prophylaxis done once yearly, some cases may require a prophylaxis more often. Having a dental performed slows the progression of gingivitis (Inflammation of the gums) and periodontal disease (bacterial infection, plaque and calculus built up, painful, gum recession, bone loss, missing or broken teeth). Inflammation of the gums leads to infection which can be painful for both animals to…

study was able to demonstrate the induction of BRONJ with drugs (ZA+DX), although there were issues with the dosage of both drugs, with DX being relatively high and ZA being too low to replicate the clinically used regimen. Also, the extraction of all molars instead of single tooth extraction may be considered to be “excessive” as compared to other animal…

Lab Partner _________________________________ Section _______________ Objectives: To determine freezing points of pure solvent and solutions using cooling curves. Calculate the freezing point depression for the solutions of unknown. Calculate Molar Mass of unknown solute. Introduction: When a solute is dissolved in a solvent, the freezing temperature is lowered in proportion to the number of moles of solute added. This property, known as freezing-point depression, is a colligative…

The objective of this experiment is to determine the experimental heat of vaporization and compare it to the accepted heat of vaporization of water (40.7 kj/mol). The molar heat of vaporization is the amount of energy required to vaporize one mole of a liquid at one atm and the symbol ∆ Hvap is used. The process by which the molar heat of vaporization is calculated is though the slope of a graph. The volume of…

The purpose of this lab was to determine the relationships between boiling point and molecular structure. To do this we used four different chemicals, all with the same molecule but just with different subscripts. To preform this experiment, we were required to use a hot plate, water bath, alcohols, ketones, and alkalines, a test tube, capillaries, and a test tube cap. Once the water was boiling, we lowered the test tube into the water and waited until the chemical began to boil. Once the…