The lab started off by measuring critical materials for the lab: the mass of an an empty 100 mL beaker, mass of beaker and copper chloride together(52.30 g), and the mass of three iron nails(2.73 g). The goal of this experiment is to determine the number of moles of copper and iron that would be produced in the reaction of iron and copper(II) chloride, the ratio of moles of iron to moles of copper, and the percent yield of copper produced. 2.00 grams of copper(II) chloride was added in the beaker to mix with 15 mL of distilled water. Then, three dry nails are placed in the copper(II) chloride solution for approximately 25 minutes. The three nails have to be scraped clean by sandpaper to make the surface of the nail shiny; if the nails are not clean, then some unknown substances might accidentally mix into the reaction and cause variations of the result.
Copper Standard Solutions Preparation: To prepare the copper standard solutions the students added 15 M NH¬4OH (4mL) to a designated amount of stock solution (0.100 M) in a volumetric flask (50mL). Standards one through six contained the following mL of original stock solution: 1.00, 2.00, 4.00, 6.00, 8.00, and 10.00. Once each of these solutions were combined with the ammonium hydroxide (4 mL) they were filled to the mark on the volumetric flask (50mL) with distilled water and swirled. Recording Absorption
This technique separates solid substances that were dissolved in a liquid. Filtration is another technique used to separate substances in mixtures to find the purest form of the particles. This separation can filter out bacteria from water, making it safe to drink. (Libretexts, 2022). Sand, KNO3, CuSO4, and mineral oil were the different samples used to separate them back into their pure substances.
Shifa Sayeed can you check if this is all in past tense and if it has personal pronouns? The purpose of this experiment was to observe and thoroughly analyze how different substances of dissimilar intermolecular forces acted in different scenarios of evaporation, evaporative cooling, and boiling. In the lab, the three substances tested and compared were Acetone, Acetic Acid, and Propanol.
Throughout the experiment, copper was altered a total of 5 times, but after the final chemical reaction, solid, elemental copper returned. Each time the solution changed color, a precipitate formed, or when gas appeared, indicated that a chemical reaction was occurring. For the first reaction, copper was added to nitric acid, forming the aqueous copper (II) nitrate (where the copper went), along with liquid water, and
Objective: In this lab, students learned the different methods there is to separate substances from one another. They practiced the process of decantation, extraction, filtration, and sublimation. Introduction: Theory: Before being able to isolate the components in a mixture, the students should’ve become familiar with the physical properties of each of the substances. The students were given an unknown sample which has a combination of three different components.
Describe how you walked for each of the graphs that you match. Part 2: #7 Graph: To achieve the graph given, start one meter away from the motion detector. Then, in the time span of two seconds, walk farther away from the detector to approximately 2.5 meter and land there exactly at three seconds after beginning to walk. Then, walk towards the motion detector to 1.7 meters away from it in 1.5 seconds.
The heating of the solution caused the reaction to start which decomposed Cu(OH)2 and made the solution colorless and darkened the precipitate. The fourth step was the formation of CuSO4. After the solution was decanted from the precipitate and washed with near boiling water, 6 M H2SO4 was added to the beaker containing Copper (II) Oxide and this caused the precipitate to dissolve and the liquid become clear blue. The last step was the formation of Cu(s). This step recovered Solid elemental copper.
Introduction: The purpose of this experiment is to demonstrate the different types of chemical reactions, those including Copper. There are different types of chemical reactions. A double displacement reaction is a chemical process involving the exchange of bonds between two reacting chemical species. A a decomposition reaction is the separation of a chemical compound into elements or simpler compounds and the single-displacement reaction is a type of
This purification process is signified by water. When
During the science lab, the concept investigated was diffusion. The purpose of the lab was to see whether or not cell size affected the rate of diffusion. Therefore, the hypothesis made in the lab was that cell size does affect the rate of diffusion. Since the hypothesis was that cell size affects the rate of diffusion; it was accepted based on the analytical results tested in the lab. One significant finding of the experiment based on the data about the three cubes was the inverse relationship which was as cell size increases, the surface area to volume ratio decreases.
Yes, the steel ball rolling on the counter top moves with a constant velocity. The steel ball took 0.4 sec to cover a distance of 20 cm. The formula to calculate average speed equals to total distance over total time. So, 20 cm divided by 0.4 sec equals to 50 cm/sec. So the speed of the ball is 50 cm/sec.
The purpose of this lab is to analyze and to become aware of the many trends that exist within a periodic table, as well as to help us develop the skills we need to accurately graph our observations. This is done by collecting data on the elements, graphing them and then finally finding a connection we see in the pattern created on the graph to the placement of the elements on the periodic table. Sergent Welsh periodic table Graph Paper Pencil Eraser Calculator Ruler 2 Coloured Pencils The data for the Atomic Radius and the First Ionization Energy of the first 36 elements was copied from the Sergent Welsh periodic table onto an observation chart.
In an interview with E. Poimenidou, professor of Mathematics, he described a good mathematical writing as precise, not overly verbose, and have a kind of flowing logic to them. A New College graduate student (2013) in chemistry/biology said that a well-written lab report should be factual, to the point, and evidenced based. A good lab report, according to a chemistry TA at NCF, has a “flow” of ideas that makes it stand out from other reports.
If impure, preform recrystallization procedure to remove the impurities. Then calculate Percent Recovered on crystals formed, and preform melting point procedure. 2. You find that a solid substance you are trying to purify is very soluble in ethanol, but not very soluble in water. You decide that you are going to try to recrystallize it from a solvent pair, consisting of ethanol and water.
