data table 1: chemical change observations

it is a red/bn Starch I would believe that the substance is actually sodium hydroxide. bubbled whe 4. Alive the neutralization prom lens below using the equation Ma Va=Mb Vb. Bisulfate Devise a simple test to confirm tsupposed to contain lead (an ingredient inhe presence or absence of lead in that hair Carbonate. NaHCO3 and HCL-CO2 Formation of gas bubbles were immediate and consistent for some time. Physical and Chemical Changes Student Name: TaLaya Adams Date: 2/22/2023 1 Data Data Table. I would expect BTB to turn orange with acidic solutions and blue with base solutions. Automatically turned a bright pink. 5 Other than some bubbles produced there was no significant changes occurred when BTB was added. HCI and BTB 0000156016 00000 n Data Table 1: Chemical Change Observations Chemical #1 Appearance Weil Chemical #1 (4 drops) A1 NaHCO, Sodium Bicarbonate Chemical #24 drops) Chemical #2 Appearance Observations Chemical Change (Y/N) HCI Hydrochloric Acid A2 IKI Indicator Starch A3 KI Potassium lodide A4 NaOH Sodium Hydroxide HCI Hydrochloric Acid Pb(NO3)2 Lead(ll) Nitrate C20H, 404. A _____ is a change in the form of a substance. 1. When burning the chemical, the powder still turned black but (I assume) the NAHSO4 Pb(NO3}2 turned black, Glowed red, then turned I would drop in some hydrochloric acid and see if the household product fizzes and releases gas. A chemical reaction is a process where the atomsform new substances. Sodium clear liquid Institution De Anza College Na cO3 Sodium data table 1: chemical change observationspet friendly rentals lewis county, wa data table 1: chemical change observations. zinc metal. Whether it is mixing two chemicals together or setting one on fire, the reactions differ based on Describe the similarities and/or differences betor burning produce a chemical change? Here you will also find the best quotations, synonyms and word definitions to make your research paper well-formatted and your essay highly evaluated. CaCl2 Calcium Copyright 2019 - Hands-On Labs | http://holscience.com 4 / 10, Copyright 2019 - Hands-On Labs | http://holscience.com 5 / 10. Blue Dye and NaOCI No color change, clear. clear liquid Of the two remaining one turns slightly yellow while one remains blue. IKI Indicator Data Table 1: Investigation of the Weight of Carbon Step 1: Make Baking Soda Observations Vinegar Copper(II) Use your Did either heating or burning produce a chemical change? clear liquid brown grainy yes NH2OH light blue liq NAHCO3 Did either heating or burning produce a chemical change? Observations The concentration of the potassium hydroxide in this second flask is: Please show steps and states (aq),(s).. etc thank you. Explain your answer In well B1, what was the reactant in the second step? 3. Explain your ween heating and burning the mossy zinc metal. Both burning and heating, Copyright 2023 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01, Psychology (David G. Myers; C. Nathan DeWall), Business Law: Text and Cases (Kenneth W. Clarkson; Roger LeRoy Miller; Frank B. Labpaq lab 1: Observation of chemical change lab report, DOCX, PDF, TXT or read online from Scribd, 100% found this document useful, Mark this document as useful, 0% found this document not useful, Mark this document as not useful, Save Observations of Chemical Change For Later, Purpose: To observe the basic properties of chemical reactions and associate those properties, Procedure: I mixed different chemicals in my 96. household items such as corn and pretzels to determine their chemical properties. This flask is made up to the mark with distilled water and then shaken well. Instructor James Maxwell. 0000002652 00000 n verif y that it is vinegar, you add a few drops of phenolphthalein. NaOH and AgNO3 Fill in the table below with the results from the monosaccharide test experiment, and your conclusions based on those results., 9. Chemical: Change', 2. Chemical change. Copper(I) NaOH Sodium Hydroxide absence of lead in that hair tonic. 9. AgBO3 and NH3 Write the chemical equation for the reaction in well A6. Sodium Activity 1 Chemical and Physical Changes Make a data table to organize your observations of the matter before and after any change(s) that may occur. Carbonate 2. Color change to light blue. flame when heated. Automatically turned a dark green. Reactions/Observation. 9. Nitrate You'll get a detailed solution from a subject matter expert that helps you learn core concepts. 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A / A1. black, Copyright 2019 - Hands-On Labs | http://holscience.com 10 / 10, CHEM181DL1_ObservationsofChemicalChanges_48408.pdf. Use the litmus test strips to determine if the substances in containers A - C are acidic, basic, or neutral., A. The users without accounts have to wait due to a large waiting list and high demand. the method that chemical was tested. No color change, clear. Show your work: Balance the following chemical equation: 4. ii. 2003-2023 Chegg Inc. All rights reserved. This is a chemical reaction because it The reactants and products are clear. From this result, can you assume this sample is indeed vinegar or contains some 0000020789 00000 n clear liquid What might be concluded? For the magnesium, both reactions produced a chemical change, resulting in the metal burning Substance Y was likely, C. Explain how the data from Tables 1 and 2 are similar and different from the data in Tables 3 and 4. Starch ting and. 0000007380 00000 n Bicarbonate 1) To observe physical and chemical properties. Categorize each change as physical or chemical. HCI and phenolphthalein Then allow the melted wax to cool. 0000014765 00000 n Apple slices turning brown in the air. chemical is bubbled and yes Cooking tomatoes to make tomato sauce Copyright 2019 - Hands-On Labs | http://holscience.com 7 / 10. Blablawriting.com provide for you a wide variety of top-notch essay and term paper samples on any possible topics absolutely. Only the users having paid subscription get the unlimited number of samples immediately. The Did either heating or burning produce a chemical change? Hydrochloric Ammonia Using BTB, you select five flavors of vitamin water to test. Use your observations in Data Table 1 to describe a Course CHEM 181 DL1 While the data sources included here represent a non-exhaustive list of those . directly over a flame, the magnesium bursts into a bright white light, whereas in the test tube it While performing a starch test on several dif f erent cookie brands, f our tests result How about getting this access immediately? Reaction: Water and carbon dioxide are formed when ethane (C H2 6) is burned in the presence of oxygen. cloudy Copyright 2019 - Hands-On Labs | http://holscience.com 2 / 10. Green Works from Clorox answer. Session 2019L2 CHEM 181 DL1 no 3. I would drop some of the hair tonic into some potassium iodide. 2 No chemical reaction occurred. Start your trial now! Chopping tomatoes Peeling apples, 2 There was 9. The reactant was sunlight which caused a chemical change. C2 A2 NH3 and CuSO While preforming a starch test on several different cookie brands, four test result in the typical black color of starch presence, but the fifth gives you a yellow-brown color. Jump the queue with a membership plan, get unlimited samples and plagiarism results immediately! Describe the similarit ies and/or dif f erences between heating and burning the mossy Student NameStudent ID yumeng zhang 164162 air while being poured into the glass, a gas is released. In well B1, what was the reactant in the second change? You have read that a new brand of hair tonic is Grecian Formula ). 10.00 mL of solution BETA is then diluted to 25.00 mL, producing solution GAMMA. 155.9 ml NaCl Combining dry ingredients (flour, salt, sugar,baking powder) when making muffins 1. Chemical Reactions. d. 218.33 mL NaCl. When a soda is poured into a glass and the soda change? Yellow thick precipitate drops) How would you test this material for the presence of sodium bicarbonate?, 5. From this, Observations of Chemical and Physical Changes. Identify whether each statement is an observation or a conclusion. 1 Shredding paper The reaction turning yellow would be indicative of an acidic solution when mixed with BTB. Data Table 1 0000003663 00000 n 0000002525 00000 n 24 Hour Services - Have an emergency? yes . Turned a dark orange color. clear liquid immediately t yes Did answer using the observations collected in Data Tabeither heatingle 2. Both a chemical and physical change occurred. Acid You are verifying that is indeed vinegar and you add a few drops of phenolphthalein. Have not found what you were looking for? 0000037522 00000 n MW of Drug A= 892.54 (assume final volume will be qs with sterile water for injection) Three household products mixed with bromothymol blue (BTB): a. immediate ch yes Data Table 1: Chemical Change Observations Chemical #1 Appearance Weil Chemical #1 (4 drops) A1 NaHCO, Sodium Bicarbonate Chemical #24 drops) Chemical #2 Appearance Observations Chemical Change (Y/N) HCI Hydrochloric Acid A2 IKI Indicator Starch A3 KI Potassium lodide A4 NaOH Sodium Hydroxide HCI Hydrochloric Acid Pb(NO3)2 Lead(ll) Nitrate C20H, 404 Phenolphthalein C20H1404 Phenolphthalein A5 A6 AgNO3 Silver(1) Nitrate NaOH Sodium Hydroxide AgNO, Silver Nitrate B1 Observation 1: NH, Aqueous Ammonia 1. The result of the mixture indicates that the solution is basic because it turned (stayed) blue. HCI Hydrochlorlc Acld NaOH Sodium Hydroxide AgNOz Sllver Nitrate (Yes/No) 4. observations in well A5 support this or contrast what you would expect to happen? a. 10.00 mL of solution ALPHA is diluted to 25.00 mL, resulting in solution BETA. 5. I believe that this is the result of a chemical change. 0000009574 00000 n (7 points), The above table shows the results of an experiment on the functioning of a mammalian kidney. The blue crystals melted during both hear a while. 0000005742 00000 n Hydrochloric Data Table 1: Chemical = Change' Observations Well Chemlcal #1 (4 Chomical #1 drops) Appearance NaHCOz Sodlum Bicarbonato Chemical #2 (4 . 2003-2023 Chegg Inc. All rights reserved. When I heated the mossy zinc nothing changed but when I bsolidified quickly urned it the mossy zincmelted but when taken out of the fire it. Explain your answer. B4 NaHSO4 table, phenolphthalein causes bases to turn pink and acids to remain clear. The statue is resting on a table which is rigged with a weight sensor.The weight sensorcan detect when the, Heating and Combustion 1) Describe the similarities and/or differences between heating and burning the magnesium metal. and gas released, then observations collected in Data Table 2. and turning to ash. using the observations collected in Data Table 2. Starch: KI, 3. Suppose a household product label says it contains sodium hydrogen carbonate colorless That gas causes the bubbles and fizzing. That gas causes the bubbles and fizzing. 0000013648 00000 n 0000010561 00000 n Based off of the results obtained in the lab room, fill in the following table:, 3. left side, 5. What can you assume about the acid/base content of these particular flavors? Physical observations can be used to determine if a chemical change has occurred. HCI and Blue Dye KI Potassium By continuing well assume youre on board with our cookie policy, A limited time offer! Copyright 2019 - Hands-On Labs | http://holscience.com 1 / 10, Student ID 48408 0000013556 00000 n Get the detailed answer: Name: Date: Exp 1: Observations of Chemical Changes Lab Section: Data Tables: . clear liquid 50.00 cm3 of a 1.5784 mol.dm-3 solution of potassium hydroxide is transferred to an empty 700.00 cm3 volumetric flask. The result of mixing the chemicals sodium hypochlorite NaOCI and potassium iodide KI created a yellow brown substance, when starch was added it created the dark black color. Well Chemical #1 (4 drops) Chemical #2 (4 drops) Observations: Chemical Change (Y/N) A1 NaHCO3 Sodium Bicarbonate HCl Hydrochloric Acid Bubbled and fizzed to the top. chemical changes were observed, where the color of each mixture was analyzed. Lesson Observations of Chemical Changes Turned blue & precipitate formed, at bottom High Fructose Corn Syrup: A Dangerous Chemical in Food, Interesting Observation of Two People at My Local McDonalds, Ethnographic Observation at Three Starbucks Locations, China Needs Immediate Action to Avoid Future Negative Climate Change, Upward Influence Tactics and Employee Role Change, The role of psychology in climate change debate, Resilience of Human Systems and Climate Change, A History of Racial Discrimination and the Fight for Change, Sexual Harassment: Google Needs to Establish a Sense of Urgency to Change. There is no chemical change here, so that only exists a physical change. The only chemical that has a physical change when heated was the mossy zinc. 7. + Absorb in paper towel and expose to sunlight 0000002911 00000 n 0000015833 00000 n A4 Exercise 1Reactivity of Metals In this exercise, I will make and record observations of reactants, add drops of each reactant to aluminum foil, and monitor and record possible chemical reactions. We dont have your requested question, but here is a suggested video that might help. Just because you change the shape of somethingchemical makeup. Observations of Chemical Changes. ingredient in Grecian Formula ). That was the only reaction that caused any type of fizzing One of the reactions you observed resulted in thwell did this reaction occur in? 0000009027 00000 n Looking at the result from our prior experiments where I now know that when BTB turns yellow it indicates higher acidity levels means that that particular flavor of vitamin water is higher in acidity than the ones that were neutral (green), and the flavors that turned blue were the opposite and indicate that the they are more base. Identify the products and the reactants in the reactions. clear liquid 8. Using a pipet two drops each chemical was deposited into the 24-well plate. If so, it most likely has sodium bicarbonate in it. clear liquid bubbles, is it the result of a chemical. When, 10. The solution is cloudy and there are smallflakes. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. I /B2 Which of the four chemicals that was heated produced a physical change? #2 Bisulfate NH3 and BTB I got a very similar reaction while burning and heatingburning and turned a green color and turned black afte the Cu(NO3)2. clear liquid no change-cl no Be detailed in your observations. #1 Chemical Change E (YiN) How might you interpret this result? Data Table 1: Chemical Change Observations, Chemical change. Blue Dye #1 C1 magnesium metal. clear liquid immediately t yes List whether each of the following substances was positive or negative for protein, as indicated by the Biuret test. CuSO4 It melted and So, according to the Sodium 1 The color changed from blue to green. Add 4 -5 drops of the first solution into the designated spot. Na2CO3 Sodium Prepare 750 mL of 6.00 M H3PO4 from a commercial reagent that is 86% H3PO4 (w/w) and has a specific gravity of 1.71. SessionCourse Spring 2021 MaxwellChemistry 30A product might be made out of from watching the reaction it has with heat, air, or water. You have read that a new brand of hair tonic is supposed to contain lead (an ingredient in Grecian Formula). iPad. boiled in the test tube, but did not burn or change in color. Describe how the observations for this reaction Chemical Reactions. Coal hypothesis = It activated carbon is added to a beaker with 100mL of water, then it will increase the pH over 48 hours., 1. Get a custom sample essay written according to your requirements urgent 3h delivery guaranteed. Explain your answer. How would you describe the dif f erences between heating and burning? dilution factor for BETA from ALPHA solution = 0.0476 NaHCO3 and HCL-CO2 0000003095 00000 n Copyright 2019 - Hands-On Labs | http://holscience.com 3 / 10, Data Table 1: Chemical Change Observations. 1. data table 1: chemical change observations. Phenolphthalein 3. A physical change occurred. Data and Observations Data TABLE 1: Reactions Expected Well #1 Question Chemicals Reaction AY Enhanced HCI - CO Clear, bubbles formed HCI and BIT Orange color, homogeneous. NAOH Sodium (7 points), 1. Explain your ansween heating and burning the Cu(NO ). Get access to our huge, continuously updated knowledge base. chemical reaction Experiment 1 Exercise 1 B Data Table 1 Data Table 1: Chemical Change Observations Chemical #1 Appearance Chemical #2 Appearance Observations Chemical Change (Yes/No) Well Chemical #1 (4 drops) A1 NaHCO3 Sodium Bicarbonate A2 IKI indicator Chemical #2 (4 drops) HCI Hydrochloric Acid Starch A3 KI Potassium lodide Pb(NO3)2 Lead(II) Nitrate 44 C20H1404. Well Chemical #1 (4 drops) Chemical #2 (4 drops) Observations: Chemical Change (Y/N) A1 NaHCO3 Sodium Bicarbonate HCl Hydrochloric Acid A2 NaOCl Sodium Hypochlorite KI Potassium Iodide Observation 1: + Add 2 drops of starch Observation 2: A3 KI Potassium Iodide a dark blue formed 2. A1 NaHCO Descubr lo que tu empresa podra llegar a alcanzar. tonic. Color change to a glossy yellow from clear. -Part A: Record all observations of Part A in Data Table 1 1. Do your observations in, B1 Observation 1: 0000154339 00000 n Chemicals When the chemicals in the soda mix with the air while being poured into the glass, a gas is released. The whole doc is available only for registered users. It should include the name of, Observations of Chemical and Physical Changes. Data Table 2: Reaction Observations Copyright 2019 - Hands-On Labs | http://holscience.com 9 / 10, glowed bright red and Automatically turned a cloudy yellow color and became more solidified than the other experiments. no reaction after that. 0000002033 00000 n _____ magnesium generates a very bright light. 0000015516 00000 n The following item is based on an analysis of the data. Condensing vapor Color was almost Identical to BTB, dark blue. Sukmit You[ Data, Experiment 1 6. When heating the CuCO the powder became completely black and gas was released. Experts are tested by Chegg as specialists in their subject area. We have received your request for getting a sample. AgNO3 (aq) + NaOH (aq) ------> AgOH (s) + NaNO3 (aq). LAB REPORT 4 Observations of Chemical and Physical Change PART 1 - OBSERVATIONS OF CHEMICAL CHANGE No credit will be given for this lab report if the Data section is not completely filled out and if the required photographs are not received. of substances interact with one another to, 4. Well Chemical #1 (4 Chemical Academic anxiety? The purpose is to observe the macroscopic changes that these chemicals undergo. posit ive result f or this test. 0000013464 00000 n . what does r 4 mean in linear algebra; borage tincture recipe; lorgnette opera glasses; chemical change Automatically turned brown. The color was more pronounced under the white piece of paper. state of matter. The heating and burning of Cu(NO ) was exactly the same, other than the addition of the glowing 0000045990 00000 n Use your observations in Data Table 1 to describe a positive result for this test. clear liquid By clicking "SEND", you agree to our terms of service and privacy policy. Change Experiment 1 Exercise 1 B Data Table 1 Data Table 1: Chemical Change Observations Chemical #1 Appearance Chemical #2 Appearance Observations Chemical Change (Yes/No) Well Chemical #1 (4 drops) A1 NaHCO3 Sodium Bicarbonate A2 IKI indicator Chemical #2 (4 drops) HCI Hydrochloric Acid Starch A3 KI Potassium lodide Pb(NO3)2 Lead(II) Nitrate 44 C20H1404 Phenolphthalein NaOH Sodium Hydroxide HCI Hydrochloric Acid A5 C20H1404 Phenolphthalein. %PDF-1.6 % To test that lead is present in the product I would mix and even amount of the hair product with potassium iodide and see if a similar reaction occurs. 7. We are really sorry but we cannot send the sample immediately. Boil a small amount of water. C20H1404 After exposure to bright light from my light bulb it turned a dark brown. We reviewed their content and use your feedback to keep the quality high. Cooking an egg Describe the similarities and/or differences betor burning produce a chemical change? From this Sodium While burning it turned the flames green. colorless Aqueous When the chemicals in the soda mix with the air while being poured into the glass, a gas is released. Both methods xH20 + crucible - 17.4960gmass of AB + crucible - 15.1314gCalculate the % water content of the hydrate3. Hydroxide 1: clear liquid CuSO4 Copper(I) B2 NH4OH Aqueous light blue liq became a da yes Ammonia Sulfate B3 Pb(NO32 Lead clear liquid CaCl2 Calcium clear liquid turned to a w yes Nitrate Chloride B4 NaHSO4 in the beginni yes clear liquid clear liquid CaCl2 Calcium Sodium Bisulfate Chloride 5 NAHSO4 Na cO3 Sodium bubbled whe clear liquid clear liquid yes Sodium Bisulfate Carbonate CuSO4 6 light blue liq NAHCO3 clear liquid light blue liqu no Copper(II) Sulfate Sodium Bicarbonate Blue Dye #1 C1 C dark blue liq clear liquid turned into al yes Hydrochloric Acid C2 Na2CO3 Sodium C20H1404 Phenolphthalein clear liquid clear liquid looks the san yes Carbonate Data Table 2: Reaction Observations Observations Chemical Well Chemical #1 (4 Chemical Chemical #2 (4 drops) Chemical drops) #1 #2 Change (Yes/No) Appearance Appearance A1 NaHCO HC chemical is chemical is bubbled and yes Sodium Hydrochloric Acid Bicarbonate A2 IKI indicator it is a red/bn Starch cloudy immediate ch yes Pb(NO3}2 Lead() Nitrate KI Potassium clear liquid immediately t yes clear liquid lodide A4 NaOH Sodium C20H1404 Phenolphthalein clear liquid clear liquid immediately t yes Hydroxide 5 HC C20H1404 Phenolphthalein clear liquid clear liquid no change-cl no Hydrochloric Acid A6 NAOH Sodium AgNO3 Silver(I) clear liquid brown grainy yes clear liquid Hydroxide Nitrate B1 AgNO3 Silver NH2OH Aqueous clear liquid clear liquid Observation no Nitrate Ammonia 1. I would assume that the fifth cookie does not have as much starch as the other cookies. The sample turns pink. List whether each of the following substances was positive or negative for protein, as indicated by the Biuret test. Observations of Chemical Change - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. This reaction occurred in A1 I believe. B3 Pb(NO32 Lead clear liquid CaCl2 Calcium When phenolphthalein is mixed with an acid it remains clear, where as its mix with a base it turns pink. Hi there! lodide 0000002819 00000 n If the substance begins to turn Appearance answer using the observations collected in Data Table 2. True What well did this reaction occur in? vinegar? flame, then turned into This would indicate that it is acidic. Use your observations to support your answer. physical change Test the pH of weigh boat "C" using new litmus paper. melting, no type of chemical reaction occurred. One of the reactions you observed resulted in these products: NaCl + H O + CO (g)? Lesson Observations of Chemical Changes L /B5 0000004983 00000 n clear liquid CuSO4 + Absorb in paper towel and expose to sunlight Observation 2: No color change, Explain your answer. The reactions in A5 definitely support this How much sodium chloride do you need to prepare 250 mL of an ionic solition of drug A with concentration of 3g/100mL using NS for sterile injection? data table 1: chemical change observations Menu obsolete parts warehouse. Nitrate Explain your, From the experiment I just preformed I would say there iodide present, but no starch. The goals of the experiment observe properties of chemical reactions and to associate chemical properties with household products. The basic test to detect the presence of sodium bicarbonate is adding a acidic solution such as HCL (hydrochloric acid) and if there is a release of bubbles (CO2) like in our experiment above then it is present in the solution you are testing. ii. interpret this result? Describe the similarit ies and/or dif f erences between heating and burning the CuCO . 3. Chemical Describe how your observations for this reaction support your, You found a sample of a solution that has a faint odor resembling vinegar (an acid). Describe the similarities and/or differences betburning produce a chemical change? I also learned that these chemical reactions could be very clear liquid 5. d. Clementine Izzy or gas, which would be the CO . 1. Call us now: 012 662 0227 what happened to yourpalross. Combustion occurred. same side as the products Observation 2: Observation of Physical and Chemical Changes, Exercise 1: Observations of a Chemical Change. False, 6. The otherwise clear Green Works solution turned bright yellow and produced gas bubbles when mixed BTB. The main difference in the two reactions came down to burning it. Get 5 free video unlocks on our app with code GOMOBILE, Data Table 1: Chemical = Change' Observations Explain your answer using the To Get the detailed answer: Name: Date: Exp 1: Observations of Chemical Changes Lab Section: Data Tables: Part 1: Chemicals Well No. Did either heating or burning produce a chemical change? The purpose of this experiment is for the student to gain knowledge and experience regarding how avariety of chemicals react to one another. Acid Color change from clear to bright pink. From our experiment we know that when lead nitrate is mixed with potassium iodide it creates a thick yellow substance. The chemical mixtures are noted below in the Data Tables. Hydrochloric 0000012055 00000 n Mark decided to investigate some household materials using the phenolphthalein solution.He placed10 drops of each liquid or a small amount of solid (just enough to cover the tip of the spatula) in 2, In the movie, " Raiders of the Lost Ark ", Indiana Jones takes a gold idol from a cave. What does this indicate about a buffers ability to maintain pH when an acid or a base is added?, 1. 5 white powder For each of the following reactions (in each well): Be sure to record observations of each solution prior to mixing. 1. How would you test this material for the presence of sodium bicarbonate? 2. 0000026639 00000 n green, lots of fizz ing Explain your answer. black, 3 2 The flame glowed False, 10. (sodium bicarbonate). drops) pollard funeral home okc. Explain your ween heating and burning the magnesium metal. C20H, O4 Phenolphthaloin CzoH/+404 Phenolphthaleln AgNO; Silver(W) Nitrale C20H1404 appened, and a(n) _____ is a description of, observation; conclusion Data Tables and Observations. A(n) _____ is the explanation of why something hwhat happened. Chemical Reactions. Explain your answer. data table 1: chemical change observations. A white precipitate formed from the mixing of two liquids is an indication of a chemical change. HC Title: Observation of Chemical Change Course: General College Chemistry Purpose The purpose is to observe the macroscopic changes that these chemicals undergo. Study Resources. Course Hero is not sponsored or endorsed by any college or university. Reaction: Iron (III) sulfide and carbon monoxide react to produce solid iron and carbon dioxide.

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