Chemical bonding

first ignited, sparks were seen and the flame emitted a bright, white light. The flame spread across the magnesium and eventually turned it into a white, ashy substance. The combination of fire and magnesium caused a chemical change. This is evident as there were many signs of a chemical change, such as an emission of light, a color change, and an odor change. The emission of light was the bright white fire, the color change was the change from the silver magnesium to the white ashes, and the…

This experiments goal was to successfully produce ZnI2 by using Zinc Sulfate (Heptahydrate) and Barium Iodide Dehydrate, which Jessica and I did with acceptable success. The definition of acceptable success for this experiment is measured by how close our percent yield was close to the ranges provided (0-2% being considered excellent precision and etc). Our percent yield was 92 % meaning that it was an acceptable, but not exactly as close to what we wanted it to be. In order to try and figure…

The TG and DTA curves obtained for the compounds (C1-C5) are shown in Figure 9. Table 4 lists the results of the thermal studies of these compounds with the initial and final temperatures (ºC), assignments of each decomposition stage based on mass calculation and DTA peaks. These assignments (Δm - Calcd.) are based on the structural fragments from the theoretical formulae of the compounds (C1–C5). This implies that the groups proposed in the right column of Table 4 are not necessarily the…

Lab report Questions What will happen when zinc is placed in copper (II) sulfate? What will happen when copper is placed in copper (II) sulfate? Prediction It is predicted that when you place zinc and copper (II) sulfate a reaction will occur, resulting in a precipitation. The prediction about the copper (II) sulfate and copper is that nothing will happen. Hypothesis It is hypothesised that when zinc is placed in aqueous copper (II) sulfate, a single displacement reaction will occur as the…

Amylase Laboratory Report Introduction: Enzymes are a catalytic protein in a quaternary structure, that helps with the acceleration of molecules called substrates to achieve its desired chemical reaction. In this lab we used a specific enzyme called amylase. According to the lab manual, amylase is an enzyme found in one’s saliva or the pancreas to accelerate metabolism and cause a spontaneous reaction that helps with digestion of a substrate called starch. In order for any polymer such as…

DISCUSSION There are three chemical properties will be discussed which are combustion, reaction with bromine and reaction with potassium permanganate. Combustion was used to test the unsaturation of hydrocarbon. The degree of unsaturation refers to the number of the rings and / or multiple bonds present in the hydrocarbon molecule (McMurry, 2015). Hexane was a saturated hydrocarbon, it completely combusted and emitted carbon dioxide plus water. Cyclohexene was an unsaturated hydrocarbon, it…

Fausto B. Mariano L. Daniel E. Diego R. Ms. Gudiño Science 3B 27/OCT/15 Lab Report Osmosis -Research Question: How will uncovering the egg shell by exposing the egg to vinegar will make it possible to understand the osmosis process in action? -Background information Diffusion: It's the net movement of molecules down a concentration gradient. This process allows small molecules like water and carbon dioxide to cross the Plasma Membrane. (Movement of dense areas to less dense areas.)…

Introduction Experiment five was a two-part experiment meant to have us practice our skills and then use those skills in actual data collection and analysis. In part one we used a sample of sodium saccharinate combined with a sample of a metal halide salt, our group used copper(II) chloride. The combination of these two samples allowed for the synthesis of a metal complex. In part two of the experiment we used a procedure similar to part one in order to collect phosphorus out of a sample of…

2.3.1.2 Antioxidant analysis Two methods to measure the antioxidant activity are by determining its ability of hydrogen atom donation to a reactive species and/or check its ability to take off any molecules of oxidative initiation. Total antioxidant capacity (TAC) level evaluation can be classified into a direct method and indirect method. Indirect method or in vitro method consists of DPPH radical scavenging activity assay, Trolox equivalent antioxidant capacity (TEAC) and oxygen radical…

Calcium hydroxide (Ca(OH)2), universally referred to as lime water or slaked lime is formed by reacting hydrated lime (calcium oxide, CaO) with water (H2O)[1] CaO (s) + H2O (l) ⇌ Ca(OH)2 (aq) (ΔHr = −63.7 kJ/mol of CaO) Calcium hydroxide is an economically favorable alkaline reagent to neutralize acid as it yields 2 moles of (OH)2 for every 1 mole of Ca(OH)2 (which is slightly soluble in water) when compared to sodium hydroxide [1] and it may separate from the solution ‘constant agitation must…