Calorimetry Of Reaction Lab Report

For this lab the knowledge to tell the difference between a chemical and physical changes was needed. To tell this the knowledge of the five signs of a chemical change was needed. These five signs are color change, odor change, production of bubbles/gas, production of heat/light, and the production of precipitate. Also prior to the lab one question was provided that needed to be answered. This question was what chemical must be present for a color change. The hypothesis that was provided to this question was If Phenol Red is add with the other chemicals then a color change will occur.

The purpose of this experiment was to determine the mass percent Cu2+ in a mineral sample (Malachite), and a rock sample (copper ore). Through the process of spectroscopy, the students were able to determine the percent of copper that each sample yielded. The students were also able to apply the information to the theoretical value of copper in malachite to determine the percent error of the mineral mass percent. Furthermore, the methods used in the experiment provide insight into how mining companies determine whether a copper ore mining site will be profitable or not. Mining companies must evaluate samples of rock to determine the percent copper which would provide the most and the purest copper for production of everyday

What we are trying to find out is more about the law of conservation of mass. The way we are trying to figure this out is by doing an experiment called the Copper Cycle which is where you start with copper and add many different chemicals and lots of process where the copper is no longer visible. We wanted to see for ourselves what happens to copper when we made many chemical changes and in the end what happened to zinc when the copper appeared. What we found out at the end is that the copper appeared again which tells us that the copper never left and was never destroyed. What we also found out that the zinc did not leave but it dissolved into the solution and displaced copper forcing it back into copper solid.

The purpose of the experiment was to use two methods to find the presence of cations in an unknown solution using qualitative analysis. Qualitative analysis was used to identify a substance, not measure its amount. The first method used multiple solutions such as HCl, HNO3, H2SO4, NH4OH, acetic acid, K2CrO4, and K2C2O4 to conduct two tests. The first tested the presence of either Lead (Pb2+) or Silver (Ag+) while the second tested the presence of Calcium (Ca2+) or Barium (Ba2+). The second method used flames to burn metal ions in solution and observe the colors shown to identify the ion present in solution.

The copper content of U.S. pennies has declined over the years due to rising prices. The expensive metal makes up just 2.5 percent of one-cent pieces minted in 1982 or later; nickels, dimes and quarters, on the other hand, are mainly composed of copper. Still, today’s pennies cost more than their face value—an estimated 1.8 cents each—to produce.

A topic of interest in science is the evaluation of the law of conservation of matter through different types of chemical reactions and determining the percent yield resulting from these reactions. This law states that after a chemical reaction, matter should neither be created nor destroyed. This experiment allows for this law to be tested and for the determination of different errors that may occur during chemical reactions similar to this one. The magnitude of these errors can be found through the percent yield calculated by using the original mass of

This experiment has the aim to determine a chemical formula of hydrated compound, which ingrains cupper, chloride and water molecules in its structure. In order to find this hydrated compound, it is necessary to use the law of multiple proportions. In other word, finding the appropriate variables values to this compound (CxCly*zH2O). Additionally, two major steps are required to proceed the experiment. The first consists to heat a sample to liberate the water hydration, and then compare two mass weights before and after heating so gets easier to find the water percentage (mass). Second step consists in chemical processes with the sample that drives to determine the percentage of the other element.

As a young man, Ira Remsen was intrigued by science, leading him to perform an experiment that he saw in a textbook. This experiment involves a series of chemistry topics, triggered by the reaction that occurs between nitric acid and copper. The experiment involves an elevated flask, plug, a hose, and a container of water the set up is diagrammed below:

800 mL of raw water was transferred to six beakers using a measuring cylinder and a marker was used to assign different numbers to each beaker.

Analysis Questions: 1. In step #1, when water was mixed with CuSO4, the water turned a blue colour. Can you definitely confirm it is a physical or chemical property? Support your answer. I am unable to confirm that the action stated in this question is a

Sample one had a positive reaction with Biuret’s reagent and Lugol’s reagent; however, no precipitate formed with Benedict’s reagent. Sample three did not have a positive reaction with Biuret’s reagent because it had a gray color change. There was a positive reaction between sample three and Lugol’s reagent and Benedict’s reagent. Sample nine had a positive reaction with all three reagents.

In this graph the results is about what we expected, which is a big amount of heat given off. In observing the graph the distance between reaction 1 and reaction 2 shows the total amount of heat given off which is the combination of 1&2 in comparison to room temperature that the water was originally at.

Heat is the form of energy, thermal energy, which flows between two substances due to their difference in temperature.1 The measurement of heat flow is called Calorimetry and the apparatus used to measure the heat flow (temperature change) for a reacting system is called a calorimeter. The calorimeter is well-insulated device that help to minimize the heat exchange between the system being observed and its surroundings.

What I have done are Hypotheses paragraph, introduction, conclusion, (not provided this time) and experiment. The following words are used to explain my experiment in detail.

1. In this graph the temperature that the beaker started of at was at -2 degrees because it had just came out of the freezer for 48 hours. There were times where the graph plateaued out and times when the graph had an incline. There was an incline when the results reached 42 degrees until it reached 90 degrees. The graph plateaued out when the temperature reached 26 degrees and stayed on for one minute (4mins to 5mins). It also stays on 96 degrees for 2 mins (14mins to 16mins). The results always goes higher because the ice melts from the heat, when the ice melts means that the water is getting hotter. At the beginning of this experiment the water was only increasing in temperature very slowly, and in the middle of the graph the water increases faster, however at the end the water slowed down staying on