chemistry lab paper sherlock holmes experiment

When combined Sodium Bicarbonate and Hydrochloric Acid, Carbon Dioxide is produced. The two chemicals do not undergo a change in color but a chemical change when CO2 is produced.

We were assigned mystery powder convertible which contained calcium carbonate, baking soda, and sucrose. We found out that the mystery powder had calcium carbonate because when it reacted with iodine it turned orange/brown. When calcium carbonate reacted with vinegar it had a fizzy-like reaction. It also reacted with hydrochloric acid and that caused it to bubble. When we tested the mystery powder it also turned orange/brown when we added iodine. Also when we added vinegar and it also fizzed like the calcium carbonate. Again when we added the hydrochloric acid it reacted exactly like calcium carbonate, lots of bubbles were made. We know that the calcium carbonate was in the mystery powder because it had similar reactions.

These reactions can be seen from just a little bit of reaction all the way up to a complete change of the entire sample tested. Some samples of those tested in this experiment which showed the chemical reaction were the baking soda/ammonia mixture, the Epson salt and baking soda mixture as well as the food coloring mixed with the baking soda and bleach. 2. Which reactions, if any, do you believe showed no evidence of chemical change? Justify your reasoning.

Create a control group by testing the three reagents in distilled water. Fill three tubes one centimeter of the length with distilled water. With a permanent marker, label the test tubes according to which reagent will be used. In order to test for sugars, preheat a beaker that is three-fourths full of tap water and bring the water to a boil. In the first test tube, drop five drops of biuret reagent to test for protein, in the second, drop five drops of iodine to test for starches, and in the third, drop five drops of Benedict’s reagent to test for sugars. Using a tube grabber, place only Benedict’s reagent test tube in the boiling water for a total time of three minutes. Using the tube grabber, carefully remove the Benedict’s reagent tube from the boiling water and record the color of all 3 liquids in the test tubes. Place the tubes in the

In the experiment “White Before Your Eyes” four various white powders were experimented on using various liquids (baking soda, cornstarch, sugar and a mystery powder). The purpose of this experiment was to discover what powder/mixture of powders the substance was.

In order to show you why these students believe the mystery mixture is a combinations of NaHCO3 & C6H8O7 I will need to show you the mixture’s chemical and physical properties. The NaHCO3 & C6H8O7 mixture is a bright white color, and has a slight airy smell. The claim also has a powdery white substance or the NaHCO3. It also has small white spheres, that resemble the mystery mixture’s, which is probably the C6H8O7. The students have also learned through experimentation that if you leave the

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.

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

Eleven mystery test tubes labeled from K-1 to K-11 contained: 6M H2SO4, 6M NH3, 6M HCl, 6M NaOH, 1M NaCl, 1M Fe(NO3)3, 1M NiSO4, 1M AgNO3, 1M KSCN, 1M Ba(NO3)2, 1M Cu(NO3)2 respectively. The contents of the test tubes were determined by chemical experiments. Solution K-1 contained NiSO4 because when solution K-9, ammonia which was identified by its pungent odor, was added, an inky dark blue color was made. Iron (Fe (NO3)3) was determined to be in test tube K-2. KSCN was found in test tube K-11 since Fe (NO3)3 and KSCN makes a bloody color when mixed together. Flame tests were conducted in which K-8

The objective of the experiment was to observe different reactions with different chemicals. The experiments emphasized on the chemical changes occurring in acids and bases as well as color changes and bubble formations. The experiments allowed for a better understanding of the undergoing chemical changes in mixtures. Some mixtures instantly changed colors while others were transparent or foggy. Some mixtures produced thick color that created solids called precipitates. Mixtures KI + Pb(NO3)2 and NaOH + AgNO3 both produce noticeable precipitates after a while. It was interesting to see the different acidic and base reactions like the fuchsia color formation in NaOH + phenolphthalein.

For example, in the experiment when I poured Hydrochloric acid in a test tube and then one magnesium ribbon, the substances started to bubble. Other than that, when I took the wooden split and lit it, I burned the green paper and it changed brown around the edges of the paper.

The luminous yellow flame is smoky because no air is entering the burner and hydrocarbon is converted into carbon dioxide

The materials that were used to carry out the experiments on the water samples were ten testing kits. We ran 10 tests on all

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

This hypothesis relates to the experiment by saying how when different liquids were used, there were many different reactions. Proving the hypothesis is supported. The experiment could be done differently by using other powders, liquids, etc. This could cause many changes. One thing is the expansion of options. It would have many substances to compare to the unknown. Thus creating a lot more options for the unknown powder to be. It could also increase the probability of error, from having so many different resources. Sources of error could include adding too much powder and not enough liquid. Doing this could cause the balance to be off. For example, not adding enough liquid could cause the powder to not react. When in reality, the substance usually fizzes or changed color. Doing this experiment made learning about different reactions to different substances