Part F: "Elephant Toothpaste" Record observations about this teacher demonstration. With water, light energy from the sun, and carbon dioxide from the air, photosynthetic organisms are able to build simple sugars. This resource is part of ourMicroscale chemistrycollection, which brings together smaller-scale experiments to engage your students and explore key chemical ideas. Explain your answer. Student Name Stacia Anderson Student ID 193994 Lesson Observations of Chemical Changes Institution Lord Fairfax Community College Session Fall 2021 Course CHM 101 - Introductory Chemistry I - Lab Instructor Ebrahim Abdurahiman Final Report Exercise 1 1. IX. With the aim of producing a room temperature functional hybrid gel and tackling the high crystallization point, various imidazolium-based ionic liquids were investigated. Add 5-10 drops of potassium iodide solution. Describe how your observations for this reaction support your answer., 3. Is cutting a cake into 8 pieces a chemical or a physical change? Proper way to Dispose of Excess Reagents. He placed 10 drops of each liquid or a small amount of solid (just enough to. Because it is very insoluble it is non-toxic, unlike other, soluble, barium compounds. The practical features displacement, redox and precipitation reactions between various salts, including potassium manganate(VII), barium nitrate and ammonium vanadate(V). Barium sulfate is used as a barium meal in medicine since it is opaque to X-rays. Properties of Matter Chemistry. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate). Chemistry questions and answers. Qualitative Observation of a Chemical Reaction Introduction Procedure: 1. hol observation of chemical changes lab report. 2. Schemes. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate). Explain your answer. Final Report. If liquid, dump in sink 2. Start with a setting of two, the temperature should slowly rise. Lab Report 2 Observations of Chemical Changes Objectives: (1 of 20 points) The objectives of this experiment are: 1. I would drop in some hydrochloric acid and see if the household product fizzes and releases gas. lab report biol 1108 laboratory documents laboratory guidelines read all labels on chemical bottles before using them. Information about your use of this website will be shared with Google and other third parties. If so, it most likely has sodium bicarbonate in it. Explain your answer. 4. Observation of Physical and Chemical Changes, Title: Observations of Chemical and Physical Changes Experiment, Objective: The objective of this experiment is to observe and record chemical and physical changes in, substances. If so, it most likely has sodium bicarbonate in it. Solution :- Chemical change means the making and breaking of bonds means some molecules reacts to form new molecules of the . It will have no effect because the phenolphthalein only changes color depending on the pH level. hol observation of chemical changes lab report. Chemical Change Lab. Add two drops of iron (II) sulfate solution to the potassium manganate (VII) solution. Procedure: A series of chemical reactions were performed to record observations about chemical changes, physical changes and the difference between the two. At least one photograph must show the student's face. After all the ingredients are added, they should . If a different indicator such as methyl was used, a different amount of base would have been required to change the color of the solution, offsetting the molarity of the acetic acid with phenolphthalein., Many methods can be used to indicate the endpoint of a reaction; titrations often use visual indicators (the reactant mixture changes color). Put two drops of ammonium vanadate(V) solution into box 5. Put two drops of lead nitrate solution into box 2. Each activity had a different kind of their version of either a chemical or physical change when they had different kinds of solutions put together. Add two dropsof sodium sulfate solution to the drops of barium nitrate solution. 1. change in color. Purpose The purpose of this lab was to measure the temperature of a solution to see how much energy was gained/lose during the reaction between the NiCl2 and Ethylenediamine. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate). If such a stress is applied, the reversible reaction will undergo a shift in order to re-establish its equilibrium. Submit your completed report on Blackboard. Use this practical to investigate how solutions of the halogens inhibit the growth of bacteria and which is most effective, The physics of restoration and conservation, RSC Yusuf Hamied Inspirational Science Programme, How to prepare for the Chemistry Olympiad, guidance on apparatus and techniques for microscale chemistry. To associate chemical properties with household products Background Information: (2 of 20 points) Chemical changes are often accompanied by physical changes. After this step was completed I combined three different household cleaners with bromthymol blue to observe whether the cleaner was an acid or base. Observations of Reactants : Zinc is in solid state and copper sulfate in aqueous state. Online Financial Reporting Tutors. In this visually engaging series of experiments, students observe and identify the chemical changes that take place in a range of reactions on a microscale. Observing chemical changes - student sheet, Observing chemical changes - teacher notes, Unit A2 2: Analytical, Transition Metals, Electrochemistry and Organic Nirtrogen Chemistry. Barium sulfate is used as a barium meal in medicine since it is opaque to X-rays. melts (see Figure L2.1). 1,200 words, Move the clustered bar chart to a chart sheet, Identify the sources of emotions and moods, Resurrecting sex resolving sexual problems and rejuvenating your relationship, I wandered lonely as a cloud literary analysis, The proof of the pudding is in the eating essay, Module 01 Discussion - Adapting to Consumer Demand, New belgium brewery social responsibility. Titrations involving a strong acid and a strong base commonly employ phenolphthalein as an indicator. Add two drops of sodium hydroxide solution tothe iron(II) sulfate solution. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate). It took four trials to try and do this experiment and to get a good amount of results to compare. 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. Headway Lab. Cardboard, lighter, fat candle holders, and a pencil to write on the cardboard. Barium sulfate is used as a barium meal in medicine since it is opaque to X-rays. Place the thermometer and the capillary melting point tubes in the Mel-temp apparatus chamber. OBJECTIVES 1. Copyright 2019 - Hands-On Labs | http://holscience.com 4 / 10, Copyright 2019 - Hands-On Labs | http://holscience.com 5 / 10. Add two drops of sodium hydroxide to thebarium nitrate solution. Hands on Lab (HOL) Student Lab Kit: Students can order their lab kit directly from HOL using the link provided in Blackboard. how to verify an unverified sender in outlook. Put small samples of each substance in a test tube along with 3 mL of water to determine their solubility. Name: Date: Exp 1: Observations of Chemical Changes Lab Section: Data Tables: Part 1: Chemicals Well No. The three latter substances were produced in Virginia. Lab Report 2 Observations of Chemical Changes Objectives: (1 of 20 points) The objectives of this experiment are: 1. A bright yellow precipitate of lead nitrate forms. This could be seen more easily with the black paper underneath the well plate. with a grey ring around the outside (less saturated) area. There may also be some light blue precipitateof copper(II) hydroxide. Essay about Lab Observations of Chemical Changes. Read our privacy policy. Final Report. Using the 96 well plate I combined various chemicals together to observe the chemical changes that were created. 3. Experimental Conclusions Within the activities 1-9, I had saw many different observations that occurred when watching the different solutions mixed. Data Table 2: Observation of Physical and Chemical Changes. We're sorry but login doesn't work properly without JavaScript enabled. Mitchell Field Community Centre Covid Vaccine, Making careful observations is a critical skill that you will employ throughout the year while doing experiments. In well B1, what was the reactant in the second step? I thought the white candle would burn slower because they are used for emergency candles when say the power goes out, well that's what people said ,but that's not what happened. After this step was completed I combined three different household cleaners with bromthymol blue to observe whether the cleaner was an acid or base. 4.7. Observations would most closely match my classmates and not interpretations because observations are objective and interpretations are subjective. Observations would most closely match my classmates and not interpretations because observations are objective and interpretations are subjective. A glittering of metallic silver forms as the iron(III) reduces the silver nitrate. (11) $2.50. Textbook: Chemistry 2e, OpenStax, 2019. Using the 96 well plate I combined various chemicals together to observe the chemical changes that were created. EXPERIMENT 1: Observations of Chemical Changes. Put two drops of barium nitrate solution into box 8. That gas causes the bubbles and fizzing. At the point when the indicator changes color (also, No preliminary dilution of my test chemicals were necessary as Lab Paq provided pre-diluted chemicals. This experiment concluded with testing household chemicals and proper disposal of lab chemicals., Aim: The aim of our investigation was to identify and understand how different chemicals (Acids, alkalis and neutral) react and experience a change in colour due of this., From these results, we could conclude that class cleaner(Clear Image) is basic and 70% alcohol is neutral., In a 50-mL beaker, 2-3 drops of phenolphthalein indicator was added to 9 mL of 0.1 M HCl. These experiments were completed. Record your observations. Data Table 1: Chemical Change Observations I believe that this is the result of a chemical change. This gradually changes to the brown iron(III)hydroxide as the iron is oxidised. This problem has been solved! Exercise 1. VIII. Using your results from Data Table 1 as a . I would drop in some hydrochloric acid and see if the household product fizzes and releases gas. How Long Was Bill Wilson Sober?, Wistan Publishers t/a Math Study Guide South Africa, hol observation of chemical changes lab report, Copyright - Wistan Uitgewers / Wistan Publishers, why do pigs have so many mammary papillae chegg, alphabetical list of names on the vietnam wall, How Many Players On Nfl Roster Including Practice Squad, trinity funeral home obituaries kingsport, tn, advantages and disadvantages of delaying payments to suppliers, allen funeral home hurricane, wv obituaries, orthopedic institute of central jersey toms river. These are synthesis, decomposition, combustion, single replacement and double replacement. Add two drops of iron(II) sulfatesolution to the potassium manganate(VII) solution. To observe some properties of chemical reactions 2. Supergirl Fanfiction Kara And Lena Secret Child, Data Table 1: Chemical Change Observations I believe that this is the result of a chemical change. Hashima Island Documentary, This document is not meant to be a substitute for a formal laboratory report. Substances are tested with pH strips and placed on the continuum of the pH scale range of 1 to 14. With the emergence of platforms associated with the concept of Web 2.0, which enables users to view, create and distribute content. Observations of Chemical Change Scribd. The surfaces of the pieces of zinc turn red-brown as copper metal deposits via a displacementreaction. 1. change in color. Procedure: A series of chemical reactions were performed to record observations about chemical . Background Information: Matter can undergo physical and chemical changes. 1. B) Analysis Questions So, according to the table, phenolphthalein causes bases to turn pink and acids to remain clear. The new mixture was viewed on a light and on a dark . Free Properties Of Gases Essay Example Studymoose. In a physical change, matter changes its appearance (physical properties) but not its composition. Lab Report Assistant. 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. Gas Observations. Procedure: A series of chemical reactions were performed to record observations about chemical . Also determining if a chemical change had occurred. Teaching notes and expected observations. Exercise 1. If so, it most likely has sodium bicarbonate in it. 4. release of energy in form of heat or light. Examples of physical changes include changes of state (between solid, liquid, and gas phases) and making mixtures. Disclaimer: Tutors are not employees or representatives of TutorsOnSpot.Com, Join The Community Already Trusted By Thousands Of Students Like You, Online Financial Statement Analysis Tutors, Online Online Capsim Simulation & Rounds Tutors, Online Online Classes | Quizzes | Exams Tutors. The reaction was observed and then 1 drop of HCI was . by | Jun 10, 2022 | is the infographics show credible | alien: isolation working joe | Jun 10, 2022 | is the infographics show credible | alien: isolation working joe . Observe closely using a magnifying glass. A1 Bubbles immediately formed and started popping (not rapidly). 4. Observations about the color of the solution at each step was especially noted., Observation Of Chemical Changes Lab Report, Liquid mixture appears to thicken when mixed. What actually happened was the white candle burned faster. Stazi Belvin Chemical and Physical Lab Changes Lab Report 9/5/2014 I. Purpose- The overall purpose of the lab is to identify chemical and physical changes. The Lab Report Assistant is simply a summary of the experiment's questions, diagrams if needed, and data tables that should be addressed in a formal lab report. Hands-On Labs, Inc. Add one drop of potassium thiocyanate solutionto the iron(III) nitrate solution. . When a soda is poured into a glass and the soda bubbles, is it the result of a chemical change? Because it is very insoluble it is non-toxic, unlike other, soluble, barium compounds. We review their content and use your feedback to keep the quality high. 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. If the substance begins to turn yellow, there is some lead in the tonic. IX. Combustion is one of the five general types of chemical reactions. OBJECTIVES 1. EXPERIMENT 1: Observations of Chemical Changes. 5 Signs of a Chemical Change. OBJECTIVES 1. The dependent variables are the things that the scientist observe to see how they respond to the change made to the independent variable. Chemical changes involve the rearrangement of molecules or atoms and result in the pro-duction of one or more new substances. Calculations: None. At least one photograph must show the student's face. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate). Taurus Horoscope 2021 Ganeshaspeaks, Experiment 1: Heat Associated with Chemical Change In this experiment, the heat of combustion reaction of a wax candle was measured. Experiment IV. Custom Original Solution And Get A+ Grades. In this lab, copper (II) chloride, CuCl 2 Chemistry questions and answers. Observations you will make that tend to indicate chemical reactions are, among others, changes in color, odor and/or temperature, gas evolution, and the formation of new solids. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate). 5. Because it is very insoluble it is non-toxic, unlike other, soluble, barium compounds. Immediate bright yellow-orange color (muddy) with gaseous consistency. declaration of inheritance in puerto rico, is it going to hail in san antonio tonight, Mitchell Field Community Centre Covid Vaccine, Fort Lincoln Funeral Home & Cemetery Brentwood, Md, Supergirl Fanfiction Kara And Lena Secret Child, how to make fake blood makeup without corn syrup. In this experiment we were also finding how many Ethylenediamine will bind to Ni+2 in an aqueous solution. Chemical changes create a new chemical substance, whereas a physical change is a change in appearance or state of matter. 3. The second explanation resulted in that the air pressure increases inside the jar because of the heat from the candle, which causes air to come out of the jar and once the candle cools down the pressure decreases and the pressure outside the jar increases which results in pushing the air in and making the water rise up. bubbles, is it the result of a chemical. 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. A physical . Sodium hydroxide solution, NaOH(aq), 1 mol dm. 2. Calculations: None. The starch has not been removed completely, but is in a lesser quantity than the others. Chemical changes create a new chemical substance, whereas a physical change is a change, Procedure: A series of chemical reactions were performed to record observations about chemical, changes, physical changes and the difference between the two. T he sample turns pink. First, a clean 7.7180 g metal can was obtained, and into it a 100 ml of cold water was placed. - Results: When a lighted match was held 2cm away from the unlighted candle in its smoke, the flame would jump from the match to the wick having been carried by the smoke. Chemical Reactions Lab Procedures: Zn and hydrochloric acid. Do your observations in well A5 support this or contrast what you would expect to happen? Army Convoy Sp, Where To Buy Cup And Crisp Pepperoni, hol observation of chemical changes lab report hol observation of chemical changes lab report. Zillow Hurricane Utah, The blue colour of the copper(II) sulfate solution fades. Purpose: The purpose of this experiment is to observe chemical changes in common consumer products to determine if the chemicals are basic, acidic, or remain neutral when mixed with other chemicals. 2Br, Gold coins on a microscale | 1416 years, Practical potions microscale | 1114 years, Antibacterial properties of the halogens | 1418 years. . by ; June 22, 2022 Explain your answer. Add two drops of sodium hydroxide to the barium nitrate solution. When the chemicals in the soda mix with the air while being poured into the glass, a gas is released. As soon as the flame catches onto the wick, the wax of the candle immediately begins to melt and evaporate through the wick to the flame to keep fueling it and allowing it to keep burning. Exercise 1. If you can recognize a reaction as being a particular type, you may be able to predict the products of the reaction. Do your observations in well A5 support this or contrast what you would expect to happen? Use a flowchart to provide the evidence for the presence of the identified cations. brown color, deep wrinkles was the final product. The mass of the can and water was measured to be 112.9789 g. Physical - change of appearance. CHEM 181 DL1 Observations of Chemical Changes. Version 42-0186-00-02. Making careful observations is a critical skill that you will employ throughout the year while doing experiments. 2. Physical - change of appearance. Chemical Changes Lab Report 948 Words | 4 Pages. chemical equation - Central Lyon CSD. If solid, throw out in trash Abbreviations for (cr), (s), and (aq) (cr) - solid powder Exercise 2: Heating and Combustion. Massage Downtown Jersey City, E1 The reaction turned dark blue. How do physical changes differ from chemical changes? A + B C. 2 NA (s) + CI 2 (g) 2NaCL 2 (s) Decomposition - A reaction where a single reactant separates to form two or more . Bird Harness Sewing Pattern. When a soda is poured into a glass and the soda change? At least one photograph must show the student's face. Jarvis V Swan Tours Lawteacher, The reactions in A5 definitely support this statement. 2. The following notes explain the expected observations for each step/reaction: A dense white precipitate of barium sulfate forms. This reaction is used to test for thepresence of iron. I would drop in some hydrochloric acid and see if the household product fizzes and releases gas. 5.5.12 use, as qualitative detection tests, the formation of precipitates of the hydroxides of Cr, Mn, Fe, Fe, Co, Ni and Cu with NaOH(aq) and NH(aq) and,where appropriate, their subsequent dissolution; 5.5.13 recall the reduction of VO (acidified ammonium metavanadate) by zinc to form VO, V and V; Unit 1: Structures, Trends, Chemical Reactions, Quantitative Chemistry and Analysis. Data Table 2: Observation of Physical and Chemical Changes. A. Proper way to Dispose of Excess Reagents. Exercise 2: Heating and Combustion. The user-generated content in online communities, which keeps growing, is a valuable source of information for both community users and business industry associated with this type of platforms, as hotel industry [1, 2], where user-generated content, in the form of . (1) No initial reaction observed (2) Purple- grey color change. IX. Read through the experiment for directions to complete this lab. Question: Identification of Gases Hands-On Labs, Inc. Alternative working schedule. The combination of chemicals were: a) Nachos (sodium bicarbonate-baking soda) and HCI (hydrochloric acid) b. ) Examples of such physical properties are: size, shape, color, and state of matter. Conclusion The purpose of this lab is to observe and make qualitative and quantitative measurements during a chemical reaction. Version 1 - Students make observations using their . A scheme is usually a sequence of two or more chemical reactions that together . and what constitutes a physical change versus a chemical change. Version 42-0145-00-02 Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The ancient Roman tradition called for mixing rain water, potash and animal tallow (rendered form of beef or mutton fat). I, 2) Mix only the sodium bicarbonate and red phenol, and observe any changes that occur., b. Dont forget to read the labels on products to find the names or formulas of acids and bases they may contain., 1. A physical . Chemical changes create a new chemical substance, whereas a physical change is a change in appearance or state of matter. Experts are tested by Chegg as specialists in their subject area. The Lab Report Assistant is simply a summary of the experiment's questions, diagrams if needed, and data tables that should be addressed in a formal lab . IX. The experiments should take approximately 20 minutes. This could be used as a topic for discussion. Chemistry Lab Report Experiment 2: Properties and Changes of Matter. 3. temperature change w/o use of heat. a Values reported are averages of at least three determinations with average standard deviations of 26%. One of the reactions you observed resulted in these products: NaCl + H2O + CO2(g)? Added 5 grams of cobalt carbonate to 20 mL of hrdrobromic acid in a beaker. 5. formation of new substance. Place the thermometer and the capillary melting point tubes in the Mel-temp apparatus chamber. Teaching notes and expected observations. Adding substances that will not change the pH level will have no effect., Phenolphthalein is more basic than methyl when comparing one another on the pH scale. lincoln university oakland basketball roster; melisende, queen of jerusalem; cna requirements illinois; how are pig and human digestive system different Put two drops of iron(III) nitrate solution into box 3. hol observation of chemical changes lab report Navigation Services; Case; Leadership; Contact 1. 4. Put one drop of silver nitrate solution into box 9. View Chemical Equilibria - LAB REPORT template.docx from CHEM 1002 at Marquette University. 5 Signs of a Chemical Change. Enthalpy Of Neutralization Lab Report. June 23rd, 2018 - Lab Report Chemical and Physical Changes Chemistry by The purpose was to HCI and BIT (Brotherly blue) c. ) NH (ammonia, a base) and 1 drop of BIT d. ) HCI and blue dye e. ) Blue Dye and NAACP (sodium hypochlorite). We review their content and use your feedback to keep the quality high. I think that the properties of bleach that allow it to remove stains (color) from things are the same properties that disallow them to combine and have a reaction or change., C. One of the reactions you observed resulted in this product: NaCl + H2O + CO2(g). Skip to document. EXPERIMENT 1: Observations of Chemical Changes. Utilizing the 96-well plate, 2 pipet drops of each chemical were added to the wells in the following combinations: a) NaHCO3+HCl b) HCl+Bromthymol blue c) NH3+1 drop Bromthymol blue d) HCl+blue dye e) Blue dye+NaOCl followed by HCl f) NaOCl+KI followed by various test foods g) KI+Pb(NO3)2 h) NaOH+phenolphthalein i) HCl + phenolphthalein j) NaOH+AgNO3 k) AgNO3+NH3 l) NH3+CuSO4. This could be seen more easily with the black paper underneath the well plate. Stronger odor (vinegar) with liquid consistency. Initial drop produced dark brown color, upon stirring brown flakes, separated from the solution, producing a clear liquid with dark brown, (2) immediate change in color, concentrated to the highly-, min, turned rusted orange / burnt brown color. Along the way, observations were made pertaining to the reactions witnessed. Vinegar is made up to acetic acid, and according to my table, phenolphthalein does not cause acids to turn pink. Expert Answer. If so, it most likely has sodium bicarbonate in it. Lab 4: Observations of Chemical and Physical Changes Lab Report: Go to the HOL website and read the Explore section for background information. Did either heating or burning produce a chemical change? Chemical Changes Lab Report 948 Words | 4 Pages. A chemical change is defined as a change in the composition and properties of a substance. Exercise 1. Conclusion The purpose of this lab is to observe and make qualitative and quantitative measurements during a chemical reaction. Phenolphthalein acts well as an acid/base indicator. CHEM 181 DL1 Observations of Chemical Changes. That was the only reaction that caused any type of fizzing or gas, which would be the CO . Can you identify these changes as I make lemonade in this video! National hospital cost data collection round 22, Example of a speech outline in apa format. 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. In simple acid-base titrations a pH indicator may be used, such as phenolphthalein, which becomes pink when a certain pH (about 8.2) is reached or exceeded. hol observation of chemical changes lab report 08 Jun. Upon mixing, cadet (bright) blue color with small amounts of particles present along. 37 [CoCl4] 2-(alc) + 6 H2O(l) [Co(H2O)6] 2+ (alc) + 4 Cl (alc) Eq 2 The [CoCl4] 2-complex ion produces a brilliant blue color while the [Co(H2O)6] 2+ ion produces a rose- pink color. The most common chemical changes are observable through color changes, the formation of Read More Cocl2 Lab Report Lab Report for Experiment #3 Laboratory Techniques and Measurements Student's Name: Date of Experiment: 10/13/2012 Date Report Submitted 10/15/2012 Title: Observations of Chemical Changes Purpose: To learn about the international system of units (SI), to become familiar with common lab equipment and techniques, to gain proficiency in determining volume, mass, length, and temperature of a . I wanted to do this experiment I like the idea of burning candles. So the white candle burned fastest and, Qualitative Observation Of A Chemical Reaction Lab Report, Qualitative Observation of a Chemical Reaction. OBJECTIVES 1. Jesse Smith Ink Master Portrait, 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. Photosynthesis Lab. I would drop in some hydrochloric acid and see if the household product fizzes and releases gas. Labpaq lab 1: Observation of chemical change lab report The white candle in all three trials burned faster than the blue one. Think about how phenolphthalein acts as an acid/base indicator. January 28th, 2013 - Labpaq lab 1 Observation of chemical change lab report by jessica Observations of Chemical and pretzels to determine their chemical properties . To observe some properties of chemical reactions 2. Photosynthesis is one of the most important anabolic chemical reactions that allows life to exist on Earth. Heat gently over a burner flame until the wax melts completely; then allow, 1. For regularly shaped solids, such as a cube, sphere, cylinder, or cone, the volume can be calculated from its measured dimensions (length, width, height, diameter) by using an appropriate equation. I would drop some of the hair tonic into some potassium iodide. VIII. At least one photograph must show the student's face. This is known as Le Chatelier's Principle. Data Analysis - use experimental observations to classify reactions. Allow the candle to burn for a few minutes noting any changes. There are five main types of chemical reactions.