Mystery Powder Experiment

In a chemistry stockroom, a vial of an Unknown White Compound was found. In order to properly dispose of the substance, the substance has to be identified .The possible compounds has been limited to one of 15 different compounds. Also, approximately 5 grams of the Unknown White Compound (UWC) were available for testing. In order to determine the properties of the compound, a series of tests was conducted. These tests included a ph test, a conductivity test, a flame test, a sulfate test, a halide test, an ammonium test, a solubility test, and a carbonate test. Using the results of these experiments, it was hypothesized that the UWC is potassium chloride. To further confirm the hypothesis, a synthesis of potassium chloride was conducted.

Similarly, the sugar, baking soda, Epsom salt, and washing soda are all dissolved in water. Next, we observed the color after adding the universal indicator. The unknown substance came out a greenish yellow and almost perfectly matched, the Urocit-K had the same. Then, we tested the reactions the solids had with heat. The unknown substance did not react.

This was determined by observing significant reactions that occurred when the powders that Unknown Mixture #2 consisted of were individually tested with the liquid reagents. Alka-seltzer proved to be a highly reactive reagent as bubbling occurred whenever any of the liquid reagents were mixed with it. It appears that alka-seltzer created a neutralization reaction with each of the liquids. Since alka-seltzer and baking soda contain similar chemical properties, it can also be inferred that the bubbles that were apparent for each of these neutralization reactions was the gaseous carbon dioxide that was created during the reaction. While alka-seltzer seemed to be highly reactive, table salt wasn’t very reactive at all. Despite the fact that salt wasn’t very reactive, it can still be deduced that salt was in Unknown Mixture #2 without noticing any of its reactions. This is because it is already evident that baking soda and cornstarch are in Unknown Mixture #1. Since two of the four possible substances are already in Unknown Mixture #1 and none of their special properties were observed in Unknown Mixture #2, the presence of salt in Unknown Mixture #2 can be confirmed by using the process of elimination. By understanding how each of the powders reacts with each of the liquid regents, the substances of the unknown mixtures can be

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.

The purpose of this lab was to test different substances using various procedures to see what biomolecules were present and ultimately find out what restaurant Anna Lyza had eaten at before she died. For the first control test, we used vegetable oil to test for lipids. So, if the solution does not contain lipids, it does not become translucent when placed onto a paper bag square and held up to a light. So, it is a negative result. However, in the presence of lipids, the solution will become translucent when placed onto a paper bag square and held up to a light. Therefore in this case, the result is positive. On the other hand, we used albumin egg to test for proteins in another control test. If the solution does not contain proteins, it will not experience any color change and so it is a negative result. When there are proteins existing in the solution, it will turn bluish/purplish and for this reason it is a positive result. Furthermore in the third control test, we used dextrose to test for simple carbohydrates such as glucose. If the solution does not contain simple carbohydrates, it will not undergo any color change and will remain a blue color. So, it is a negative result in this circumstance. If there are simple carbohydrates present in the solution, the solution will turn reddish and so the result is positive. For the last control test, we used starch solution to test

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 believe mystery powder 14 is powdered sugar (sucrose). I was first able to eliminate both of the known flours, the cornstarch and the baking powder with a vinegar solubility test because the powder immediately fizzed and, after being stirred with a toothpick, dissolved. The powders I was able to eliminate either did not bubble or did not dissolve into the vinegar. Noting the physical properties, that the powder was a bright, opaque white that formed small clumps, I predicted that the powder was powdered sugar. To confirm my prediction, I performed three other tests. The heat test was consistent was powdered sugar, resulting in streams of smoke, a sweet smell, and a caramelization of the powder. The sodium hydroxide (NaOH) test further support

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.

Problem: How can I construct a design to keep an egg safe from a 5 meter fall?

1. What type of macroscopic evidence for chemical change did you observe during this experiment? Give at least three different examples. (15 points) The main evidence of chemical change in this lab is the change in color, production of gas, and the production of precipitate.

The purpose of this experiment is to identify an unknown substance by measuring the density and boiling point. I will be able to conclude which substance is my own from a list of known options stating what its real boiling point and density is.

There was confusion to whether it was Urea or Sucrose, however, the sweet aroma from mystery white solid B signaled that it was sucrose. The mystery white solid C was determined to be cornstarch. This was determined due to a positive iodine reaction during

The smaller the pieces of a solid is, the quicker the reactant react. It is normal that a powdered solid will develop a faster reaction than the mass being the same amount but is presented as a large chunk. The solid that was in a powder form has a greater surface than the solid that was presented as a large chunk. An example of this theory is with the powder reacting to gas, it would be easier for the gas to penetrate its way through the little particles of the powder. If the object was in a chunk, it would take a really long time for gas to penetrate through the object or it may not even penetrate it. As predicted, the powdered solution dissolved faster than the rest as there was less surface area for it to react on. Having a small surface

The purpose of this lab is to test substances and to determine the physical and chemical properties of substances.

The identity of the small white grains present in the floor dirt sample is salt, this is proven through the properties that were tested in the lab. Firstly, when the white powder was dissolved in water, the solution was able to conduct electricity. This same thing happens when you dissolve salt in water. Salt is an ionic compound, which means that when it is dissolved in water it will be able to conduct electricity as well. These ions allow the solution to conduct electricity this happens because the ions can move freely allowing them to conduct electricity easily. In addition to this, when the white powder was heated it did not melt. In fact, it stayed intact when held over the flame for 3 minutes. When salt is held over a Bunsen burner, it