Chemical Reactions and Identifications of Unknowns Data Analysis Name: _Gloria Smith_________________________________________ Please answer the following questions with complete sentences unless a fill in the blank is given. Your answers must be typed. Do not plagiarize! Identification Tests: Flame tests are used to identify the __metal ions_ of a compound. Litmus paper is used to identify acids and bases. What general rule can be followed when using Litmus paper? If the red litmus paper reacts with a base the place of contact will turn blue. If the red litmus paper does not change color, then the solution is an acid. In contrast, if the blue litmus paper turns red when it comes in contact with a solution, …show more content…
(i.e., what was the evidence of reaction?) When the piece of magnesium come in contact with the flame, it ignited and emitted an intense bright white light. The light was so intense that it was painful to look at. Furthermore, after the metal was done burning the piece of magnesium changed color and consistency. Before the reaction it was a dull gray, malleable piece of metal. After the reaction it was white and brittle, like a burnt piece of paper. It no longer displayed its original qualities. Since the magnesium reacted with oxygen to form MgO, the mass of MgO should be greater than that of the magnesium. Did this occur? If not, why? No, this result did not occur. The original mass of the magnesium was 0.07g, after the reaction the mass of the MgO was only 0.01g. Instead of gaining mass, the reaction resulted in a loss of mass. These results could be explained by the reaction itself. When the piece of magnesium ignited, minute particles were being expelled from the piece of metal. Evidence of such loss of material was displayed as a white film on the end of the tongs which held the metal. If the reaction was conducted in a more controlled environment, then maybe the theoretical results would be …show more content…
When the students placed the wire containing the sample in the flame it burned a orange/ red color. when this result was compared with the previous flame tests it could have resulted from either CaCl2 or NaCl. Both of these compounds produced an orange flame. After the flame test was conducted, the students performed a litmus test to identify whether the unknown was neutral or a base. When exposed to the red and blue litmus paper, no reaction occurred. each paper remained it's original color, thus concluding that the unknown was neutral. These results also led the students to believe the unknown was CaCl2 since it was listed in the neutral column. After the litmus test was conducted the students added a few drops of Na3PO4 to the unknown. When these two were combined a precipitate was formed. This final test on unknown F verified that it was CaCl2. If it was NaCl there would have been no precipitate formed during this final
The purpose of this lab was to be able to use physical characteristics to determine the identity of an unknown compound. The data from this experiment classified aluminum as metallic; ascorbic acid, paraffin, palmitic acid, sucrose, graphite, and water as molecular; sodium chloride as ionic. In order to determine this, 3 tests were conducted. The first test was to test the conductivity of each substance at room temperature. In this test, only graphite and aluminum conducted.
Characteristic Property- Test 3- Flame Test Materials: tongs, unknown 6, matches Procedure: at the sink, we held a small piece of towel that was soaked with the liquid fraction 6 and held it with the tongs for the lit match to light it on fire. Data: We found that the unknown is flammable after it automatically lit on fire and burned during the burn test.
Molar Relationships: What Are the Identities of the Unknown Compounds? The purpose of the experiment was to identify unknown compounds using knowledge on the concept of mole. The guiding question for this experiment is what are the identities of the unknown compounds? The numbers of moles and the identities of the compounds are the only given. To be able to identify the compounds the mass, molar mass and the number of moles will be needed.
One of the reactions you observed resulted in this product: NaCl + H2O + CO2 (g)? What well did this reaction occur in? Describe how the observations for this reaction support your answer. B BoldI ItalicsU Underline Bulleted list Numbered list Superscript Subscript70 Words A reaction I observed in number 1.)
Purpose: The purpose of this lab is to titrate an unknown solid acid (KH2PO4) with a standardized sodium hydroxide solution. After recording and plotting the data, the acid’s equivalence point will be recorded once the color changes. Using the equivalence point, the halfway point will be calculated, which is used to determine the acid’s equilibrium constant. The acid’s calculated equilibrium constant will be compared with the acid’s established pKa value.
Litmus is a type of compound called an indicator: a substance that turns one color in the presence of acids and another color in the presence of bases. This is the reason that the red litmus papers and the yellow indicator papers turned blue when they touched the Windex®, Ivory® soap, Tilex®, and Comet®- these
The color of the flame help in determining the compound. Reasoning: The Flames test lab shows how different compounds react to heat and energy. After testing all compounds we were able to find out the unknown compounds.
Chemical compounds that are available to determine are CaCO3, CaCl2, Ca(NO3)2, mgCl2, MgSO4, KCl, HCl, HC2H3O2, KNO3, K2SO4, NaC2H3O2, Na2CO3, NaCl, Na2SO4, HNO3, H2SO4, HNO3, H2SO4, NH4Cl, (NH4)2SO4, K2CO3, 0.1 M AgNO3, 0.2 M BaCl, Mg(s), NaOH, and KOH. To start this experiment, start with the flame test by gathering a Bunsen burner and a Nichrome wire. Connect the Bunsen burner with a rubber tube to a laboratory gas. To prepare solutions for the flame test, weigh out 0.205 gram of Unknown Compound using an analytical balance and mixed it into a 140 mL beaker filled with 20 mL ionized water. Ensure that solid is completely dissolved using a stirring rod.
Pat McGurrin October 24, 2015 Period #1 Honors Biology Mr. Dinunzio Murder and Meal Lab Analysis Procedure: 1.) Gather all materials: Safety goggles, 250ml beaker, water, hot-plate, test-tubes, paper bag tear, stomach contents, pipette, Biruet solution, Benedict’s solution, and Iodine solution. 2.) Put on safety glasses.
Introduction: The purpose of this experiment is to demonstrate the different types of chemical reactions, those including Copper. There are different types of chemical reactions. A double displacement reaction is a chemical process involving the exchange of bonds between two reacting chemical species. A a decomposition reaction is the separation of a chemical compound into elements or simpler compounds and the single-displacement reaction is a type of
Throughout the experiment, copper was altered a total of 5 times, but after the final chemical reaction, solid, elemental copper returned. Each time the solution changed color, a precipitate formed, or when gas appeared, indicated that a chemical reaction was occurring. For the first reaction, copper was added to nitric acid, forming the aqueous copper (II) nitrate (where the copper went), along with liquid water, and
By reacting Mg( magnesium ) with O ( oxygen) in the air magnesium oxide will be produced
As soon as the wire was submerged into the solution, the aluminum atoms and the copper (II) ions underwent a reduction-oxidation (redox) reaction, meaning aluminum was oxidized and donated its electrons to the copper ions, which were reduced. As a result, solid copper began to form on the surface of the aluminum wire, giving the wire a brown-orange color that resembled rust. The wire had to be regularly shaken in order to remove the solid copper particles and thereby expose more of the aluminum wire to react with the surrounding solution. As the reaction progressed, the liquid copper chloride solution slowly began to lose its color and turn clear. This was a chemical reaction, as seen by the bubbles formed with the wire was added, meaning gas was released when aluminum was oxidized and copper was reduced, but it also gave rise to physical changes, such as the change in color of the solution from blue-green to rusty orange to clear.
To improve this experiment, there could be better Bunsen burners: for some students, the fire was not strong enough so the magnesium strip did not glow and react. Also, there could be description or a standard time of how much oxygen should react with magnesium so that the exact mass of magnesium oxide could be
The experiment was to indicate if the substances are acidic, base or neutral and was tested during the lab to obtain a final answer. The procedure we followed were simple: we gathered the materials and cleaned them out and then shortly after we tested the fluids with 2 Litmus paper of each color. As we finished the procedures we got result almost immediately with four out of the six being neutral and only two being acidic. The results supported part of our hypothesis as the last two were incorrect. The last two were guessed as being base and acidic but was neutral which was astonishing because rubbing alcohol showcased characteristics of being acidic which led us to believe it was, but was not supported with the data.