Chemical Reactions Lab Report

The goal of the experiment was to identify Unknown 33A and 33B. Unknown 33A was a white, crystalline solid that had a sweet cherry smell and Unknown 33B was a beige, yellowish color liquid that was translucent and had a viscosity similar to water. Also, the liquid was homogenous and smelled sour, similar to mildew.

Based on the results of the test, the unknown substance was Calcium Chloride. Multiple tests were performed to determine the identity of the substance. By comparing known positive results to the unknown substance, properties could be discovered about the substance. Most tests led to this conclusion, however some tests did not follow the established properties of Calcium Chloride.

The primary goal of this laboratory is to correctly identify an unknown substance. To achieve this task, one may use various tests that reveal both chemical and physical properties of a substance. By comparing the results of a known substance and the unknown substance, one may eliminate alternative possibilities and more accurately predict the undisclosed compound. Furthermore, by performing these tests, data can be collected and verified regarding chemical and physical properties of the unknown. Understanding the chemical properties of a known substance aids one’s understanding of the unknown based on comparative analysis of the results of the tests.

I looked at what the uses were in everyday life and compared it to how the mixture reacted. For example, citric acid is used in sodas, the mystery mixtures had bubbled resembling soda, so I made an inference that the two correlate and that is why we used citric acid as one of your first experiments.

The  lab was broken into three parts:  Part  1 dealt with identifying a  cation, Part 2 an

In the last test, we had to test out a mystery powder (powder A, B, C), in its own separate test tube, in order to solve the Sherlock Holmes Mystery. Our group had powder C. When we mixed water in the mystery powder, it did not dissolve. When the litmus paper was put into the test tube it turned blue. When the vinegar was mixed it bubbled/foamed up. When we mixed the iodine solution, there was no reaction and the solution turned to a dark brown/black color. When we mixed in the baking soda there was no reaction and it turned to an even darker color.

I figured this out by using the results from the five tests then using the process of elimination. You need to explain the specific tests and HOW you eliminated certain ingredients. The suspect I think committed the crime is Tavaglione. The way I figured this out was I took the results from each powder then compared the powder with the evidence sample. I found that the heat test was the most helpful because, you can hear and see a difference in the substance that is being tested. A test that made a chemical reaction was the vinegar test. What are the 5 signs of chemical reaction? I think more tests than just the vinegar test yield chemical reactions. The vinegar test makes a chemical reaction because, when the vinegar touched the ingredient it will create bubbles. After figuring out E&B have are the same ingredients as the footpowder I still had to test the evidence to see if they were the exact same ingredients. You would also want to test the evidence twice to make sure you didn’t make a

The different foods were; Heavy Cream, Fat Free Milk, White Grape Juice, Gatorade, Water, Corn Oil, and Laundry Starch. Unknown A is Gatorade, Unknown B is Laundry Starch, Unknown C is White Grape Juice, Unknown D is Water, Unknown E is Fat Free Milk, Unknown F is Heavy Cream, and Unknown G is Corn Oil. The lab group figured this out by reading the food labels and seeing what ingredients are in it and what tests matched. In reality it was just a matching game.

Students were given two unknown compounds that were solid and liquid. Unknown 47A was solid that had a white powder with crystal flakes. The smell of Unknown 47A had a vanilla mix with an acidic. For Unknown 47B, it was a liquid and it had a high viscosity. The color of the liquid had a slight brown color to it, but for the most part was colorless. When the light hit towards it, it gives out a rainbow effect. In addition, it had a mild acid smell for Unknown 47B.

For the lab, what we did was we had five chemicals to mix. We had a 4x3 spot plate and dropped a small amount of two different chemicals. When the two different chemicals are combined we would notice if it’s acidic or basic. If we had gotten a clear reaction than we would add one drop of acid-base indicator. And if we have gotten a green that would indicate that it’s neutral. The purpose of the lab was to see the outcomes of two different types of chemicals mixed together. Before I started the lab my prediction was that most of the chemicals would show different colours but I was mistaken most of the combined chemicals were clear and one drop of acid base indicator it showed us if

Performing this experiment had limitations of not being able to analyze the rocks for specific elements like an experienced scientist would have. Using rocks of the same mineral composition, and size would eliminate that variable. The solutions were prepackaged and could not be analyzed with the equipment on hand. Analyzing the solution would allow the scientist to identify the specific elements in the solutions. The temperature in a professional lab would be regulated better than it was in this experiment temperature plays an important role in chemical

Before the experiment was initiated, qualitative observations were taken for all six mystery compounds and recorded. Necessary precautions like wearing safety

In 8th grade there were 20 scientists who was trying to figure out the mysterious mixture of chemicals. At first there were nine chemicals total. Now they have narrowed it from nine to 2. All 8th graders think it has baking soda in it. Half of the class is in disagreement with the other 1/2 . Half of the class thought it was Baking soda, and Citric Acid. The other half thought it was Baking soda and Vitamin C. The data going to be presented with help you understand why half of the class thinks it baking soda and citric acid, and why they don’t think it’s baking soda and citric acid.

The objective of this lab was to use qualitative and quantitative measurements and observations to properly identify, and then confirm the identity of an unknown compound. After identification, the compound would have to be synthesized, in our case, through an acid-base reaction, followed by confirming its identity with the original unknown compound.

Also a tray was provided that would be used to mix the ions and reagents. One by one the reagents and ions were mixed. Everyone had to make sure to write down what they observed. Some things that were noticed was color change,smell,texture, precipitation, and so on. Lastly the unknown ion must be identified by comparing it to the other ions.