The Cu Later Lab

This labs objective was to determine how much copper is in a penny. Concepts that were used for this lab were calibration curves, and oxidatoin of metal.

The experiment is to observe a variety of chemical reactions and to identify patterns in

In the experiment, What Goes Around Comes Around, the element copper was put through a series of chemical changes to observe whether or not the final copper precipitate had the same mass as the initial mass of the copper. The purpose of this lab is to prove the Law of Conservation of Mass, which states that mass cannot be created nor destroyed. In the experiment, if the final mass of the copper precipitate is equal to the initial mass of copper, this law is proven because the copper was not destroyed in the chemical reactions nor was it created. Copper was first combined with the compounds nitric acid(HNO3), water(H2O), and sodium hydroxide(NaOH). This mixture was first chemically separated using heat to boil out the water. The aqueous solution

It is a chemical reaction where the colors of both solution and iron strip changed. It is

In this task the concentration of an unknown sample of copper sulphate using colorimetry was used to find the concentration. In this investigation copper sulphate was used which is CuSO4.5H20 as a formula. To make a standard solution which was 1M, the same clean equipment was used to make up the standard solution as used to make sodium carbonate. However there was one difference and that was that the hot distilled water was used to dissolve the copper sulphate crystals. There had to be enough hot water in order to dissolve the crystals into the beaker and then add cold distilled water to cool the solution.

The purpose of the experiment is to cycle solid copper through a series of five reactions. At different stages of the cycle, copper was present in different forms. First reaction involves reaction between the copper and nitric acid, and copper changed from elemental state to an aqueous. The second reaction converted the aqueous Cu2+ into the solid copper (2) hydroxide. In the third reaction Cu(OH)2 decomposed into copper 2 oxide and water when heated. When solid CuO reacted with sulfuric acid, the copper returned to solution as an ion (Cu2+). The cycle of reactions was completed with the reaction where elemental copper was regenerated by Zn and Cu

Washing of the copper is necessary in this experiment to separate the iron from the copper and make sure the iron is not counted in the mass of the copper.

2. The subject who was diagnosed with secondary hypothyroidism was given levothyroxine (synthetic Thyroxine). After 6 weeks of

Copper wire turned white when submerged in distilled water, little crystal-like substances forming on copper

The Copper Cycle is a popular experiment used to determine if an element, in this instance, copper, reverts to its elemental form after a chain of reactions. This experiment is very dangerous because of the reactions between the strong acids and bases. In this experiment I performed a series of reactions starting with copper metal and nitric acid to form copper (II) nitrate. Then I reacted copper and several other solutions such as, sodium hydroxide, sulfuric acid, ammonium hydroxide, and hydrochloric acid to form precipitates. In conclusion my percent recovery

Purpose: The purpose of this experiment was to observe the many physical and chemical properties of copper as it undergoes a series of chemical reactions. Throughout this process, one would also need to acknowledge that even though the law of conservation of matter/mass suggests that one should expect to recover the same amount of copper as one started with, inevitable sources of error alter the results and produce different outcomes. The possible sources of error that led to a gain or loss in copper are demonstrated in the calculation of percent yield (percent yield= (actual yield/theoretical yield) x 100.

The lab performed required the use of quantitative and analytical analysis along with limiting reagent analysis. The reaction of Copper (II) Sulfate, CuSO4, mass of 7.0015g with 2.0095g Fe or iron powder produced a solid precipitate of copper while the solution remained the blue color. Through this the appropriate reaction had to be determined out of the two possibilities. Through the use of a vacuum filtration system the mass of Cu was found to be 2.1726g which meant that through limiting reagent analysis Fe was determined to be the limiting reagent and the chemical reaction was determined to be as following:-

The Lawrence Livermore National Lab is a facility that conducts federal research. The Lawrence Livermore Lab is located in Livermore, California. It is founded by the University of California in 1952 and its founders are Ernest Lawrence and Edward Teller. The lab’s mission is to make the world a safer place.

Initially, the gathered data was put into organized tables which did not relate the data to proximity to human activity. To observe possible data trends, each data set was put into a scatter graph (Figures 18, 21, and 23). Choropleth maps were used to show the spatial distribution of data (Figures 19, 22, and 24). A pie chart (Figure 20) and a line graph (Figure 25) provide additional information to compare data amongst the sites. Mathematically, Spearman’s Rank Correlation Coefficient (“Spearman’s”) was used to test the correlation between proximity to human activity and the three dependent variables at a 95% significance level. For each test, a table is shown outlining the ranks and then either a table or graph was used to test for correlation.

To investigate whether it would be more efficient to use LED’s in our homes rather than halogen and CFL bulbs.