Automatically turned brown and when the starch was added it turned black. Burning Course CHEM 181 DL1 Explain your ansween heating and burning the Cu(NO ). Descubr lo que tu empresa podra llegar a alcanzar. NH; Aqucous Ammonia Use your When phenolphthalein is mixed with an acid it remains clear, where as its mix with a base it turns pink. While the data sources included here represent a non-exhaustive list of those . Chemical change. Cutting a steak, 3. Observations Log in Join. Using your results f rom Data Table 1 as a guide, how would you Color change to a glossy yellow from clear. turned to a w yes Wash your hands thoroughly with warm water and soap or detergent before leaving the laboratory. When heating the CuCO the powder became completely black and gas was released. Institution De Anza College 5. in the typical black color of starch presence, but the f if th gives a yellow-brown color. light blue liq Using a pipet two drops each chemical was deposited into the 24-well plate. Please please please show all the work The reactants and products are clear. How about getting a customized one? turned black, Glowed red, then turned clear liquid C20H1404 Here you will also find the best quotations, synonyms and word definitions to make your research paper well-formatted and your essay highly evaluated. 1. iPad. Starch: KI, 3. Then allow the melted wax to cool. Observation 2 after sunlight: turned darker Categorize each change as physical or chemical. Get a custom sample essay written according to your requirements urgent 3h delivery guaranteed. Hi there! Which of the four chemicals that was heated produced a physical change? C20H, O4 Phenolphthaloin CzoH/+404 Phenolphthaleln AgNO; Silver(W) Nitrale Data Table 1 50.00 cm3 of a 1.5784 mol.dm-3 solution of potassium hydroxide is transferred to an empty 700.00 cm3 volumetric flask. Explain your answer This is a chemical reaction because it Copyright 2019 - Hands-On Labs | http://holscience.com 2 / 10. Question: 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) Labpaq lab 1: Observation of chemical change lab report . clear liquid Lesson Observations of Chemical Changes Color change from clear to bright pink. 1) To observe physical and chemical properties. One of the reactions you observed resulted in these products: NaCl + H O + CO (g)? bubbled whe Fill in the table below with the results from the monosaccharide test experiment, and your conclusions based on those results., 9. experiences in the experiment to describe these dif f erences. 0000026639 00000 n answer. The result of the mixture indicates that the solution is basic because it turned (stayed) blue. Do your 3. 0000003663 00000 n What can you assume about the acid/base content of these particular flavors? Heating data table 1: chemical change observations. Data Table 1: Chemical Change Observations. Lead() Nitrate Na2CO3 Sodium T hink about how phenolphthalein acts as an acid/base indicator. NaOH Sodium Hydroxide clear liquid brown grainy yes H / B1 How would you test this material for the presence of sodium bicarbonate? Did either heating or burning produce a chemical change? A chemical reaction occurred. Is cutting a cake into 8 pieces a chemical or a physical change? Describe the similarities and/or differences betor burning produce a chemical change? physical change, 2. Baking muffin batter to make muffins no Get access to our huge, continuously updated knowledge base. Add 4 -5 drops of the first solution into the designated spot. When burning the chemical, the powder still turned black but (I assume) the 1. 6. I believe that this is the result of a chemical change. When the chemicals in the soda mix with the air while being poured into the glass, a gas is released. B2 NH4OH Turned blue & precipitate formed, at bottom 10.00 mL of solution BETA is then diluted to 25.00 mL, producing solution GAMMA. Use the litmus test strips to determine if the substances in containers A - C are acidic, basic, or neutral., A. 60 0 obj <> endobj xref 60 54 0000000016 00000 n 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. The solution is cloudy and there are smallflakes. 0000013464 00000 n In addition, the student should also gain a betterunderstanding of the household chemicals that they use in their day to day lives.Procedure:Observe the chemical changes that occur by mixing a list of . More pronounced with white paper. cloudy bubbles, is it the result of a chemical. dilution factor for BETA from ALPHA solution = 0.0476 Instructor Lea Stage, CHEM 181 DL1 table, phenolphthalein causes bases to turn pink and acids to remain clear. Carbonate Automatically turned a bright pink. The initial reaction was a light blue color, then when one drop of HCL was added it first became clear then turned a yellow/orange color. just glowed red and turned into ashes. 0000003095 00000 n From this I also learned that these chemical reactions could be very Did either heawer using the observations collected in Data Table 3 2 ting or2. SO2 + H2S ---> H2O + S, Drug A dissociates into four ions to the extent of 70%. Do your observations in, B1 Observation 1: 6. 7. True Did either heating or burning produce a chemical change? clear liquid no change-cl no Explain your answer. ii. We have received your request for getting a sample.Please choose the access option you need: With a 24-hour delay (you will have to wait for 24 hours) due to heavy workload and high demand - for free, Choose an optimal rate and be sure to get the unlimited number of samples immediately without having to wait in the waiting list, Using our plagiarism checker for free you will receive the requested result within 3 hours directly to your email. When the chemicals in the soda mix with the became a white ash, 3 2 Melted and turned clear liquid 0000011267 00000 n 2. 0000013648 00000 n 0000003003 00000 n 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. When a soda is poured into a glass and the soda change? colorless AgNO3 (aq) + NaOH (aq) ------> AgOH (s) + NaNO3 (aq). 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. I got a very similar reaction while burning and heatingburning and turned a green color and turned black afte the Cu(NO3)2. A4 B, clear to straw yellow color Use your observations in Data Table 1 to describe a Nitrate That gas causes the bubbles and fizzing. data table 1: chemical change observations. Describe the similarit ies and/or dif f erences between heating and burning the c. 146.6 mL NaCl 1. tonic. green, lots of fizz ing i. Describe how the observations for this reaction support your answer. Copyright 2019 - Hands-On Labs | http://holscience.com 9 / 10, glowed bright red and in the beginni yes your answer with observations made and recorded in Data Table 2. We have received your request for getting a sample. 0000009574 00000 n First week only $4.99! looks the san yes directly over a flame, the magnesium bursts into a bright white light, whereas in the test tube it Question/ Well Number Chemicals Reactions/Observation. Combining dry ingredients (flour, salt, sugar,baking powder) when making muffins You'll get a detailed solution from a subject matter expert that helps you learn core concepts. That yellow stayed concentrated at the top segregated. Automatically turned brown. 2. Devise a simple test to confirm the presence or absence of lead in that hair product. How about getting this access immediately? Phenolphthalein 0000045990 00000 n Sorry, but copying text is forbidden on this website. Use your observations in Data Table 1 to describe a positive result for this test. While performing a starch test on several dif f erent cookie brands, f our tests result into a bright white The whole doc is available only for registered users. Is cutting a cake into 8 pieces a chemical or a physical change? clear liquid immediately t yes Blue Dye and NaOCI J /B3 state of matter. He placed 10 drops of each liquid or a small amount of solid (just enough to. Blue Dye #1 1. That was the only reaction that caused any type of fizzing I would drop some of the hair tonic into some potassium iodide. support your answer. What does this indicate about a buffers ability to maintain pH when an acid or a base is added?, 1. 2. clear liquid Observation Devise a simple test to confirm tsupposed to contain lead (an ingredient inhe presence or absence of lead in that hair 0000012055 00000 n Based off of the results obtained in the lab room, fill in the following table:, 3. 0000003188 00000 n Na cO3 Sodium Phenolphthalein acts well as an acid/base indicator. and gas released, then green, the crystals (7 points), The above table shows the results of an experiment on the functioning of a mammalian kidney. part c and d? colorless coloreless right side This experiment examines the reactions of common chemical s contained in consumer products. B4 NaHSO4 ting and. 0000029863 00000 n chemical reaction Reaction Copyright 2019 - Hands-On Labs | http://holscience.com 3 / 10, Data Table 1: Chemical Change Observations. Describe the similarities and/or differences betburning produce a chemical change? Observations of Chemical and Physical Changes Exercise 1: Observations of a Chemical Change Data Table 1. 5. Physical and Chemical Changes Student Name: TaLaya Adams Date: 2/22/2023 1 Data Data Table. clear liquid d. Clementine Izzy d. 218.33 mL NaCl. The reactant was sunlight which caused a chemical change. chemical is bubbled and yes I would assume that the fifth cookie does not have as much starch as the other cookies. clear liquid 0000002652 00000 n I believe that this is the result of a chemical change. 2. Explain your answer. Did this reactant cause a chemicalr. 1 The color changed from blue to green. Data Table 1: Chemical Change Observations. Bicarbonate Pb(NO3}2 A / A1. By continuing well assume youre on board with our cookie policy, A limited time offer! In a chemical reaction the reactants are on the _____ of the written chemical equation. You have read that a new brand of hair tonic is supposed to contain lead (an ingredient in Grecian Formula). 10.00 mL of solution ALPHA is diluted to 25.00 mL, resulting in solution BETA. Get the detailed answer: Name: Date: Exp 1: Observations of Chemical Changes Lab Section: Data Tables: . was sodium hypochloriteand potassium. Support it is a red/bn Starch Cross), Chemistry: The Central Science (Theodore E. Brown; H. Eugene H LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward), Biological Science (Freeman Scott; Quillin Kim; Allison Lizabeth), The Methodology of the Social Sciences (Max Weber), Civilization and its Discontents (Sigmund Freud), Principles of Environmental Science (William P. Cunningham; Mary Ann Cunningham), Educational Research: Competencies for Analysis and Applications (Gay L. R.; Mills Geoffrey E.; Airasian Peter W.), Brunner and Suddarth's Textbook of Medical-Surgical Nursing (Janice L. Hinkle; Kerry H. Cheever), Campbell Biology (Jane B. Reece; Lisa A. Urry; Michael L. Cain; Steven A. Wasserman; Peter V. Minorsky), Forecasting, Time Series, and Regression (Richard T. O'Connell; Anne B. Koehler), Give Me Liberty! 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. Did answer using the observations collected in Data Tabeither heatingle 2. From this result, can you assume this sample is indeed vinegar or contains some Observations of the React LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION . If you need this or any other sample, we can send it to you via email. The only chemical that has a physical change when heated was the mossy zinc. 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. Sodium . conclusion; observation, 7. The sample turns pink. Copyright 2019 - Hands-On Labs | http://holscience.com 7 / 10. b. Windex, i. Chopping tomatoes Peeling apples, 2 Reaction: Water and carbon dioxide are formed when ethane (C H2 6) is burned in the presence of oxygen. Bicarbonate The chemical mixtures are noted below in the Data Tables. Alive the neutralization prom lens below using the equation Ma Va=Mb Vb. Phenolphthalein NaOCI and KI Cloudy on top. trailer <<1F743DE7EAF4484B866163DC32EB514E>]>> startxref 0 %%EOF 113 0 obj <>stream acid, and according to my table, phenolphthalein does not cause acids to turn pink. C turned into al yes This reaction occurred in A1 I believe. Whether it is mixing two chemicals together or setting one on fire, the reactions differ based on From our experiment we know that when lead nitrate is mixed with potassium iodide it creates a thick yellow substance. Use your observations to support your answer. dark blue liq Do not sell or share my personal information. 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 dark blue formed For each of the following reactions (in each well): Be sure to record observations of each solution prior to mixing. Turned a dark orange color. 0000012812 00000 n Three household products mixed with bromothymol blue (BTB): a. C1 The purpose is to observe the macroscopic changes that these chemicals undergo. 0000003571 00000 n 8. NAHSO4 A1 NaHCO Nitrate 0000013107 00000 n 3. 0000004983 00000 n Copyright 2019 - Hands-On Labs | http://holscience.com 8 / 10. pollard funeral home okc. 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The color was more pronounced under the white piece of paper. Session 2019L2 CHEM 181 DL1 clear liquid 0000002525 00000 n The otherwise clear Green Works solution turned bright yellow and produced gas bubbles when mixed BTB. From the above data, give the correct formula for the hydrate. 0000154339 00000 n clear liquid Test the pH of weigh boat "C" using new litmus paper. Both a chemical and physical change occurred. Coal hypothesis = It activated carbon is added to a beaker with 100mL of water, then it will increase the pH over 48 hours., 1. Transcribed Image Text: 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 . 0000042217 00000 n With a. brown color separated and created chunks. False. Ammonia Hydrochloric NaOH and AgNO3 You can learn exactly what a 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. Data Table 1: Investigation of the Weight of Carbon Step 1: Make Baking Soda Observations Vinegar Chemical Bisulfate clear liquid CuSO4 K /B4 Data Table 1: Chemical Change Observations I believe that this is the result of a chemical change. boiled in the test tube, but did not burn or change in color. 0000010561 00000 n Write the chemical equation for the reaction in well A6. (7 points), Section 1: You will be testing 4 known solutions for pH levels using a standard wide-range indicator. 2. We'll occasionally send you account related and promo emails. 1. bubbled and turned Appearance drops) 4. The users without accounts have to wait due to a large waiting list and high demand. The heating and burning of Cu(NO ) was exactly the same, other than the addition of the glowing c. Apple Jucie. In this experiment there were fourteen different chemicals of which were mixed with each other twelve different times and I observed there reactions. This would indicate that the solution you are smelling is not vinegar because it acidic and would not turn pink. C2 change? answer using the observations collected in Data Table 2. When a soda is poured into a glass and the soda bubbles, is it the result of a chemical 0000001895 00000 n starch has not been removed completely, but is in a lesser quantity than the others. One of the reactions you observed resulted in this product: NaCl + H, did this reaction occur in? bubbles, is it the result of a chemical. Experts are tested by Chegg as specialists in their subject area. 0000009027 00000 n 0000009972 00000 n clear liquid test this material f or the presence of sodium bicarbonate? After exposure to bright light from my light bulb it turned a dark brown. helpful when trying to identify the chemical makeup of items. Clear no reaction. Blablawriting.com provide for you a wide variety of top-notch essay and term paper samples on any possible topics absolutely. Find the corresponding NaOH indicator. clear liquid Observation of Physical and Chemical Changes, Exercise 1: Observations of a Chemical Change. Label each substance on seven pieces . Observations Chemical In well B1, what was the reactant in the second step? 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). By clicking "SEND", you agree to our terms of service and privacy policy. A(n) _____ is the explanation of why something hwhat happened. The concentration of the potassium hydroxide in this second flask is: Please show steps and states (aq),(s).. etc thank you. Suppose a household product label says it contains sodium hydrogen carbonate (sodium. (7 points), 1. Explain While burning it turned the flames green. Sulfate A physical change occurred. Copyright 2019 - Hands-On Labs | http://holscience.com 1 / 10, Student ID 48408 I would drop in some hydrochloric acid and see if the household product fizzes and releases gas. IKI indicator 2 No chemical reaction occurred. AgBO3 and NH3 Color change to light blue. The goals of the experiment observe properties of chemical reactions and to associate chemical properties with household products. 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. A white precipitate formed from the mixing of two liquids is an indication of a chemical change. clear liquid 0000007380 00000 n chemical is To verifythalein. Heating chemicals is defined by the process of combustion. posit ive result f or this test. AgNO3 Silver(I) Describe how the observations for this reaction a. Three of the flavor-samples turn a murky green indicating thelikelihood of acid/base balance. If so, it most likely has sodium bicarbonate in it. I then tested this on household items such as corn and pretzels to determine their chemical properties. You found a sample of a solution that has a f aint odor resembling vinegar (an acid). Automatically turned a dark green. Both methods what does r 4 mean in linear algebra; borage tincture recipe; lorgnette opera glasses; 0000006566 00000 n No problem! Explain your ween heating and burning the magnesium metal. The selected data sources were chosen as an attempt to represent a variety of commonly used data sources including directly observed weather station observations, gridded interpolation data, and gridded assimilation data incorporating remotely-sensed observations. Whatbservations for this reaction support your colorless Institution Ocean County College clear liquid 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. 24 Hour Services - Have an emergency? Lesson Observations of Chemical Changes What well did this reaction occur in? 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. 5 Observation of Phy & Chem Observations (FINAL), CHEMP106_GOBObservationsofChemicalChanges_150205 (1).pdf, CHM131_309_ObservationsofChemicalChanges_94772.pdf, HOL Observations of Chem Changes Exercise 1.docx, Exercise 2 Observations of Chemical and Physical Changes 02 03 17, EXP1 Observation of Chemical and Physical Changes.docx, Thompson and Smith 201130 reported that teachers modelling positive, Question 18 Experts believe that a problem with returning a bird to its cage, The nature of information that is to be presented in the budget estimates and, Even if you had the cash you arent entirely sure it could get you anywhere, 4 When the students have completed the filming and photographing ask them to, PTSD 19 May SWKHXYQ10947 Abbeville OBGYN 30 Jun JZDQJCD10947 Abbeville Gastro, Their legs so awkward on the sand are graceful flippers in the water These small, During appendectomy a patient had the a appendicularis ligated This vessel, Screen Shot 2021-08-29 at 12.13.15 AM.png, Extension Questions Question 1 Mark decided to investigate some household materials using the phenolphthalein solution. *jh DV_ =&)&(idnb]~U4g0Dt8otSb !0=rxg_mSy8|+o="Z7X ~3Ala}Jr\N/c6&bl:%qORyK1LkrL+N5 endstream endobj 61 0 obj <. Well Chemical #1 (4 Chemical Physical observations can be used to determine if a chemical change has occurred. Automatically turned a cloudy yellow color and became more solidified than the other experiments. drops) The Instructor James Maxwell. 4. You have read that a new brand of hair tonic is supposed to contain lead (an Just because you change the shape of somethingchemical makeup. The chemical mixtures are noted below in the Data Tables. dilution factor for ALPHA from stock solution = 0.167 Hydrochloric 0000005742 00000 n I did not observe any differences between the heating and burning of the zinc. College of DuPage. Study Resources. Data Tables and Observations. ii. 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? The reactant was sunlight which caused a chemical change. T he sample turns pink. Find the corresponding IKI indicator. To verify, that it is vinegar, you add a few drops of phenolphthalein. The reaction was a misty blue color. Reaction: Iron (III) sulfide and carbon monoxide react to produce solid iron and carbon dioxide. Sulfate Identify an example of a chemical change. Question: 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) 1. Record observations of this solution in your data table. #2 Cu(NO ) . You found a sample of a solution that has a fainthat it is vinegar, you add a few drops of phenolpht odor resembling vinegar (an acid). Explain your answer. material for the presence of sodium bicarbonate? 5. NaHCO3 and HCL-CO2 Formation of gas bubbles were immediate and consistent for some time. IKI Indicator Did either heating or burning produce a chemical change? We do not have the ability to see with a naked eye individual atoms and molecules reacting during chemical changes, however there are indicators that we can observe that give us the ability to understand what is happening. observations in well A5 support this or contrast what you would expect to happen? 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.