/Filter /FlateDecode While waiting on the water and the metal to achieve the same thermal equilibrium, get a coffee cup and measure its mass. From there, determine which iron compounds are in the stock room bottles based off of the experimental mass percent results., 2. Based on the calorimetry and specific heat of the metal, Lead would be the best choice to build the companys cookware with. If Motrin contains 0.8 g of ibuprofen in a 500 mL bottle, what is the concentration of The specific heat capacity of the two unknown metals were determined by measuring the transfer of heat from the metal to water, through the use of a calorimeter. The metal was then transferred into a calorimeter where the temperature was measured. Two unknown metals were put in boiling water for two minutes to ensure thermal equilibrium. Fill in your name below and then see instructions on the following page. We added the magnetic stirrer to the calorimeter and turned on the stirrer to a slow stirring rate. Answer to Solved Chemistry - Calorimetry and Specific Heat Lab Data. The purpose of this experiment was to determine the heat of combustion of magnesium using Hesss Law. Temperature is independent of number of particles in. though, weigh it accurately and record the mass on your data sheet. Using this information, calculate Avogadro's number. Use your data, the equation below, and the specific heat of water (4 J/gC) to compute the Find it Fast! There may be some human or instrumental errors that cause the data to show inconsistencies. title. Create three research questions that would be appropriate for a historical analysis essay, keeping in mind the characteristics of a critical r, Carbon Cycle Simulation and Exploration Virtual Gizmos - 3208158, 1.1 Functions and Continuity full solutions. In addition, we will study the effectiveness of different calorimeters. The average specific heat of the unknown metal was 0.197C and was determined using a calorimeter. Stuck on a homework question? We heated the 300ml of water to a boil, then placed the metal that was in a tube and waited 10 minutes before we took it out. Over the last 540 million years, icecaps covered at least one of the Earths poles during three b. This solution was also an exothermic reaction. Joules is a measure of heat energy. Scroll down to condensed phase thermochemistry data and find the value for DHf of liquid water. Calculate your percent error. Part B and C were the same, only using two different types of magnesium (magnesium ribbon (part B) and magnesium oxide (part c)) instead of the boiling water. Reminder: H of reaction is reported in units of kJ/mol.Reaction 3 is the formation of liquid water. The purpose was also to use concepts of specific heat to observe the relationship between temperature observations and heat transfer. The energy of the water molecules increases. These can only be seen with special microscopes. Table 1. This lab includes three burning tests of different foods with different energy contents. In the boiling water, place the unknown metal sample inside for about 30 min. There is no textbook that needs to be used, however there is a stimulation that needs to be completed which is given in the file provided down below on the first few pages. The change in temperature in the second trial was 7 degrees Celsius., The specific heat capacity of a substance is the amount of thermal energy required to heat one gram of that substance by one degree. These experiments lead to reliable results, which in turn determined that the unknown metal was. Lab 4 - Calorimetry - WebAssign. (Identity) 1. This site is using cookies under cookie policy . The purpose of the lab was to explore how the specific heat of a substance can be determined using a "coffee cup" calorimeter HYPOTHESIS Based on the calorimetry and specific heat of the metal, Lead would be the best choice to build the company's cookware with. Because of heat )ow out of the system, we came to the conclusion the reac"on between HCl and NaOH was an exothermic reac"on. The energy of the water molecules decreases.b. 3. Calorimetry Lab Report o PART A. Post question. We placed a temperature probe in the calorimeter and placed the lid on the calorimeter. - Calorimetry. 5 0 obj Edgenuity has created an inviting, interactive learning environment to help guide you toward academic success and recover credits to help you graduate more quickly. 2003-2023 Chegg Inc. All rights reserved. This causes the temperature of the water to increase. The reaction is done twice, once to measure the heat of the reaction and again to determine the work done in the system. << Confidential Page 1 of 46. This is usually listed in the nutrition label on the back of any contained foods as a Calorie. When heat is added to a substance, the kinetic energy of individual particles increases, which makes them move faster resulting in a increase in temperature. This is because Enthalpy equals heat plus work (H= E+W). Finally, when cutting the top for the calorimeter, use caution with scissors. 3. Using the short fiber optic cable, record the O-scope display of **Do not forget to hand this in before leaving class! Experiment 3 PART B. 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Track and visualize how energy flows and changes through your system. ruth medina; kawasaki concours 14 seat adjustment; Related articles; angi movers; free baritone ukulele sheet music 4 0 obj Relatively inexpensive calorimeters often consist of two thin-walled cups that are nested in a way that minimizes thermal contact during use, along with an insulated cover, handheld stirrer, and simple thermometer. Abstract. Use the string attached to the metal to transfer the metal from the hot water bath to the calorimeter. Cross), The Methodology of the Social Sciences (Max Weber), Principles of Environmental Science (William P. Cunningham; Mary Ann Cunningham), Civilization and its Discontents (Sigmund Freud), Educational Research: Competencies for Analysis and Applications (Gay L. R.; Mills Geoffrey E.; Airasian Peter W.), Biological Science (Freeman Scott; Quillin Kim; Allison Lizabeth), Give Me Liberty! 11 The purpose of this lab was to find the specific heat of something that can, be set on using a calorimeter. Calorimetry Lab Report o PART A. How can the specific heat of a metal be found using a calorimeter? In the second experiment we found that the mass of the calorimeter and water with 50mls was 100.033g and the empty calorimeter was 50.857g. Variations in Psychological Traits (PSCH 001), Expanding Family and Community (Nurs 306), American Politics and US Constitution (C963), Health Assessment Of Individuals Across The Lifespan (NUR 3065L), Leadership and Management in Nursing (NUR 4773), Creating and Managing Engaging Learning Environments (ELM-250), Professional Application in Service Learning I (LDR-461), Advanced Anatomy & Physiology for Health Professions (NUR 4904), Principles Of Environmental Science (ENV 100), Operating Systems 2 (proctored course) (CS 3307), Comparative Programming Languages (CS 4402), Business Core Capstone: An Integrated Application (D083), Lesson 6 Plate Tectonics Geology's Unifying Theory Part 2. It is defined as the amount of heat required to raise the temperature of one gram of water by one degree Celsius. Mass of empty calorimeter 20.282 20.2828 Mass of calorimeter plus water 61.3478 71.120 g Mass of metal 38.290 g 39.203.8 Initial temperature of water 193 19.7C Initial temperature of metal 99.79 98.5 C Final temp . cups filled with room temperature tap water. Evaluating error: Which of these equations represents the law of conservation of energy? Since faster moving things have more kinetic energy, adding heat increases the energy of the particle. The specific heat is a valuable piece of information. Specific Heat Capacity of a Metal Trial 1 Trial 2 Mass of stoppered test tube + netal 8 B Mass of stoppered test tube 8 Mass of calorimeter B 165.791 115.640 Mass of calorimeter + water R 62.162 42.170 18.236 8 18.252 115.640 8 115.669 165.147 8165.934 so.151 8 50.265 43.926 43. . where mm is the mass of the substance and cc is the specific heat capacity of a substance. Also the position of the fuels source under the metal cup can affect the accuracy. lab calorimetry and specific heat lab report edgenuity. Place a metal in the water and record changes every 60 seconds for 300 seconds. Course Hero is not sponsored or endorsed by any college or university. T water. What happens 2. endobj E2'rV,h>>d9~(S);8o7j shx7p^6OS 2 endstream endobj startxref a) Place the lid on the upper coffee cup, and place the calorimeter into a 250 mL beaker in The only required fields for creating a student account is the first name, last name, username, and a . TITLE OF LAB (Calorimetry and specific heat) The purpose of the lab was to explore how the specific heat of a substance can be determined using a coffee cup calorimeter. See how energy is transferred between objects. To determine heat of reaction (H) from calorimetry measurements. The specific heat capacity of the first metal was determined to be . of metal and water 26.4 C 26.6 C z 25 Listen 1. Specific heat values are also commonly given in cal/gC, where 1 calorie=4.184 Joules. Use the CHART button to find an approximate CHM 151 College of the Canyons Week 15 Lewis Diagrams Molecular Geometry Worksheet. Calorimetry is the science associated with determining the changes in energy of a system by measuring the heat exchanged with the surroundings(Calorimeters and Calorimetry). How do we define the system and surroundings in this experiment and how does this definition introduce error in our measurement?Calculate H of reaction for reactions 1 and 2. If a metal has a low specific heat, then the metal could make an excellent material for cookware because it takes less heat to raise the temperature of the metal to cook food. Some terms involved with these particular concepts include: closed system, empirical law, free energy, joules law, specific, temperature, and thermodynamics. Then, use the equations to see the relationship between change in energy and the amount of substance involved. Background. Let me know if youve shared it. In this experiment, the heat capacity is determined by measuring the change in temperature of the cold water when a hot metal (that does not react with the water) is placed in it. The temperature of the water before the metal was placed was 20 degrees Celsius, when we put the hot metal into the water and stirred it with the stirring rod it was 29 degrees Celsius, the change of the temperature after the metal was placed was 9 degrees. c s = c w m w T w / m s T . The density of the unknown metal was 6.57 g/mL and was determined using a cylinder and displacement. You won't know what to do unless you understand how it works! https://www.studypool.com/documents/1511111/calorimetry-and-specific-heat-lab-reportread more. 669 Mass of. x`T?>sllBn$7 $ "f$^""`DE7"Z."*E/VV Zssy3sy B-snCXBIKD;J>P e(Rz!kkW7a3d8Hi#Pqh[E'm2;^4YR(op.mrEHn}=k)wBD .5@EvW7"-nrY%5BB9]%C.w=Vo]pv|Pu=fJQZ?Lz?|!/?D5~sjU' 44[!|B$< chemistry 60. the hw is done the website called aleks. Copyright 2023 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01. This one should help you a lot more. Scenario You work for a company that wants to make cookware. After 30 min, take the temperature of boiling water to the nearest 0 C (Ini"al temp c. The cold energy of the water molecules decreases. The handwritten data from the lab are included in Appendix A: Raw Data. Heat of Solution Mass of calorimeter + water B Mass of solid + plastic packet 8 Mass of plastic packet 8 Mass of water, 04 Mass of solid compound Initial temperature of calorimeter C Final temperature of calorimeter "C 9. Calculate the specific heat of the metal sample. /Type /Stream Wear goggles, an apron, gloves, oven mitts, and use a test tube holder. Calculate the energy Calculate the wavelength. We subtracted them two and we got the mass of water was 49.176g. TITLE OF LAB (Calorimetry and specific heat)YOUR CLASS (Chemistry in the Earth System A). 3. temperature change of both materials will be measured. 14 Calorimetry for Determination of Specific Heat Capacity Calorimetry for Determination of Specific Heat Capacity. a. In that case it can be determined by measuring the temperature change T for the contents of the calorimeter and using their specific heat - the heat required to raise the temperature of 1 gram of the substance by 1C. Use the highest temperature. Good luck. Repeat the experimental procedure three more, Using this specific heat value of the unknown metal and the density of the unknown metal, it was determined that the unknown metal was Tin. C 8 - Calorimetry Trial 1 Trial 2 ATT-T. "C 4 J - J J Approximate molar mass (MM) of metal Unknown number #1 Show your calculations in the space below. Although we had an accurate result, better temperature could have been measured better using an electronic thermostat. Lesson 8 Faults, Plate Boundaries, and Earthquakes, Copy Of Magnetism Notes For Physics Academy Lab of Magnetism For 11th Grade, Chapter 02 Human Resource Strategy and Planning, Week 1 short reply - question 6 If you had to write a paper on Title IX, what would you like to know more about? William Arndt. q = mcT. Objective: The objective of this experiment is to determine the mass percent of iron in an iron compound using a spectrophotometer. The page should say something along the lines of please Please i need it Lab: Calorimetry and Specific Heat. 1245 Words. Our verified tutors can answer all questions, from basic math to advanced rocket science! The more heat that is added per gram of substance, the greater the temperature change. Explore information provided by the CDC, WHO, literary source a for a total of at least 5 sources. J AH.. J Molar mass of solid compound g/mol J'mol AH per mole of solid The dissolution reaction is Unknown solid number Show your calculations in the space below. Which Ecosystem Is More Diverse Worksheets, ~~~..ILL -JL!.,1J LL..i:: ;. Study with Quizlet and memorize flashcards containing terms like Beryllium is a rare metal that is gray in color, strong, and lightweight. of metal), then take the metal out of the boiling water and replace it into Styrofoam After gathering your materials put together the Coffee Cup Calorimeter by placing one cup in, the other and putting hole in the lid. CustomerSupport@edgenuity.com 1-877-202-0338 imaginelearning.com . shotty's jello shots vegan; stephanie cartel crew before surgery; what does not retained mean on job application; new restaurants coming to jacksonville nc 2022 The measure of heat capacity, or the quantity of heat needed to raise the temperature of one gram of a substance by one degree Celsius, is termed specific heat and is represented by the symbol s, Cp, c. The SI units for specific heat are given in J/gC. Assignment: Response M Desertification is an extreme example of the problems associated with soil erosion. The page should say something along the lines of please Please i need it Lab: Calorimetry and Specific Heat. 13 balance. Use the next page if necessary. **Do not forget to hand this in before leaving class! When youre done, you can save as a PDF to upload to Edgenuity or share to my district Google account at . Because of the Law of Conservation of energy which states that energy cannot, While waiting on the water to boil, retrieve a piece of unknown metal to be identified and record its ID letter and its mass. compute the specific heats of each metal. This experiment was designed to determine the specific heat capacity of two unknown metal sample. Username is too similar to your e-mail address. Name 9 features of the femur that were discussed in the video lecture and study guide that are visible on the anterior surface of the femur. Finally. A metal sample weighing 45.2 g and at temperature of 100.0 C was placed in a calorimeter containing, Overall, the experiment succeeded that the metals show the theoretical properties. Lab: Calorimetry and Specific Heat Edgenuity, Inc. You should also replace all the fake Latin text with your own words (in English, of course). Determining specific heat using a calorimeter is not always perfect. Then, we calculated the volume and temperature of the water in our calorimeter before and after the experiment. P31220 lab 1 Calorimetry Lab Purpose: Students . of the Rank the three substances in order of their specific heat capacities, from highest to lowest. Annalese Decator 2/13/21 CALORIMETRY AND SPECIFIC HEAT PROBLEM: Explore how the specific heat of a substance can be determined using a "coffee cup" calorimeter. Its listed as the amount of Calories in a product per serving. A calorimeter is an apparatus for measuring the amount of heat that is involved with chemical reaction or in any other process. Question: Lab 9: Determination of the Specific Heat of a Metal Report Form Collected Data Trial 1 Trial 2 Unknown metal code: . Abstract: In this experiment, the specific heat and the density of an unknown metal was determined in order to identify the unknown metal. Lab Report lab: calorimetry and specific heat student guide information purpose explore how the specific heat of substance can be determined using https://www.studocu.com/en-us/document/edgenuity-virtual-academy/chemistry-a/calorimetry-and-specific-heat-lab-report/41742530read more. Given the density of silver is 10.5 g/cm3. Would you like to help your fellow students? According to the standard deviation equation, 5.15 x was the amount of variation that existed. For example, the unknown metal may not have set in the water bath long enough to reach the same temperature as the water causing inaccurate results when reading temperature. 35 Also set up 2 dry Styrofoam cups with a lid aside and add 100 mL The experimental enthalpy of reaction 4 can then be found using Hess Law and the enthalpies of reactions 1-3. When energy in the form of heat , , is added to a material, the temperature of the material rises. Over the last 540 million years, icecaps covered at least one of the Earths poles during three b. The reliability of the experiment was high as most groups in the class results were consistent. I found the specific heat capacity of my unknown metal in my textbook on page 260 because no metals in the chart matched the calculation I got., Aim: By adding 40cm3 of 1.0M of hydrochloric acid (HCl) to 40cm3 of 1.0M of sodium hydroxide (NaCl) of known temperature in different calorimeters (glass, styrofoam or copper), this experiment will measure temperature change of the solution with time and hence deduce which calorimeter is best, What mass of nitric oxide, NO, is present in a 2.5 L flask at a pressure of 100 kPa and 0C?, To determine the specific heat of an unknown metal through the use of a calorimeter., Heat of capacity of the calorimeter: "Cp" must be calculated at the beginning of every calorimeter experiment in Joules/ C, I. Replace all red text with your own words and then change text to black. Generic Lab Documents Descriptive Lab Report Guide Descriptive Lab Report Rubric Experimental Lab Report Guide Experimental Lab. Record the temperature of the boiling water on the hot plate with the metal and then record the temperature of the water in the coffee cup before adding the metal. Build your own system, with energy sources, changers, and users. When dealing with the transferring of heat and various process related to heat, the terms convection, conduction and radiation are frequently discussed thoroughly. These differences, however, it can be accounted for by experimental error; more over there are uncertainty on purity of the. The device used to measure calorimetry is a calorimeter. T = T final T initial. Is it possible to find the specific heat of unknown metals using calorimetry? MATERIALS. plate un"l it boils. PROCEDURE: After gathering your materials put together the "Coffee Cup" Calorimeter by placing one cup in the other and putting hole in the lid. Then measure the mass of the water and reassemble, the calorimeter. This is one of our shortest labs and they usually take me an hour or less if you read the directions carefully. You can specify conditions of storing and accessing cookies in your browser, Calorimetry and specific heat lab report can someone please write this for me , Geothermal power plants send water through pipes deep underground where it is hot. In calorimetry to find the amount of heat that was absorbed or released (q) by multiplying its mass (m), its . This lab is designed to align with AAOT science outcome #1: Gather, comprehend, and communicate scientific and technical information in order to explore ideas, models, and solutions and generate further questions. There are four basic components for thermal energy (heat): 1. To determine the quantity and direction of heat flow for the dissolution of salt., The experiment results fell a little out of range of the class average. The following data was obtained from a calorimeter experiment: The specific heat of beryllium is _____ J/gC 0.124 0.549 1.82 9.61 9520, The lab procedure https://quizlet.com/468849384/lab-calorimetry-and-specific-heat-flash-cards/read more. Subtract to find temperature changes for the water and metal. 12, copper, iron, and lead powder To determine heat of reaction (H) from calorimetry measurements. 5. Finally, equations 1, 2 and 3 can be combined into the calorimetry equation: ( 5 ) and why A) HCl B) NaNO3 C) 13/09/2022, 16:56 This new feature enables different reading modes for our document viewer. Our best tutors earn over $7,500 each month! In this lab we are measuring the amount of energy that is contained in various snack foods. The steps above were repeated for the second unknown metal as well. Hi fellow History tutors! If anyone still needed help on this, someone wrote out the student table on brainly.com, look up Lab: Calorimetry and Specific Heat. Lab: Calorimetry and Specific Heat: Student Document: Lab: Enthalpy: Student Document: Lab: Mechanical Equivalent of Heat . Please go to File Make a Copy and then renam, Fill in your name below and then see instructions on the follo, TITLE OF LAB (Calorimetry and specific heat), Business Law: Text and Cases (Kenneth W. Clarkson; Roger LeRoy Miller; Frank B. Put the medals in separate test tubes with labels. To use calorimetry results to calculate the specific heat of an unknown metal. Step 4: Once the water is boiling . Purpose: To utilize a calorimeter correctly to find the enthalpy changes in two different reactions. [ Given: Specific heat of water = 4200 Jkg -1 K -1 , Specific. :J~~UW .i.lli~-U\ ..Y\J.~ 1..U l..l~~U iU.~~~~ fY\S-, Prevention Diagnosis and Treatment of HIV and Aids Paper. Chemistry questions and answers. Specific heat values are also commonly given in cal/gC, where 1 calorie=4.184 Joules. You will use a calorimeter to collect data . Introduction: Calorimetry is the art of measuring energy.For example, determining how H 2 When 68g of silver nitrate (AgNO) is heated it decomposes to form 43.2 g of silver (A H 18.4g of nitrogen dioxide (NO) and 6.4g of oxygen O. This lab is performed in order to determine the total energy in a reaction between zinc and hydrochloric acid. - The purpose of the lab was to explore how the specific heat of a substance can be determined - How can you determine the specific heat of a metal . This one should help you a lot more. In the world of physics, the term conduction is usually defined as a form of heat transfer by the way of molecular tension inside an object or material that does not show any individual motion in its entirety (Georgia State University). laynie05 laynie05 12/14/2020 Chemistry High School answered The answers to the Lab: Calorimetry and Specific Heat step3: aluminum- 11.98 copper-12.14 [Relative formula masses: AgNO3 = 170; Ag =108; NO=46; O = 32] . For the electronic transition from n = 3 to n = 5 in the hydrogen atom. Step 4: Heat the Metals to 100 C in a Hot Water Bath. Assignment: Response Mechanism of Invertebrate calorimeter with a thermometer inserted through the hole in the lid. By comparing the data with the accepted heat capacities of various metals, the composition of the unknown samples was identified. 1065 Words. There is no specific way I need this done as long as it is completed and eligible to read. Question How can you determine the specific heat of a metal using a calorimeter? Use Hess law to determine the change in energy. We measured and recorded the mass of the empty calorimeter, and then we added the 50.0mL of chilled deionized water and recorded the mass of the calorimeter with the chilled deionized water. We then measured out 50.0mL of heated deionized water into a graduated cylinder and placed a temperature probe in the graduated cylinder. The following data was obtained from a calorimeter experiment: The specific heat of beryllium is _____ J/gC 0.124 0.549 1.82 9.61 9520, The lab procedure involves several factors, listed below. , this data to write a balanced equation for the reaction. You must show all your working. Once the mass of the unknown metal is recorded, put the metal into the boiling water. cup to mix the contents and record the temperature. Ecommerce; progress residential early lease termination. >> Our unknown metal got identified by calculating the heat change and we came to the result that we were using copperand ion metals. The lab also uses distilled water, which is water purified by a process of heating and cooling. The atoms are always moving they all have kinetic energy. -discussion of the results/data, including the identity of the metal, the accuracy [FREE] Calorimetry And Specific Heat Lab Report Answers Edgenuity | updated! Tomatoes to 100 Celsius in a hot water bath. 1. You should also replace all the fake Latin text with your own words (in SAFETY: Wear goggles, an apron, gloves, oven mitts, and use a test tube holder. Post a Question. of metal (assume 99.1C unless directed to do otherwise) 99.1 C Final temp. The second equation is: Specific Heat of Aluminum = (Heat gained by water )/ (Mass of metal (g) T of metal (C)). Is it the same rG and fG ? The average specific heat of the unknown metal was 0.197C and was determined using a calorimeter. What was the temperature change for the metal sample (Tmetal)? Calorimetry is the science of measuring the change in heat absorbed or released during a chemical reaction. Replace all red text with your own words and then change text to black. Here are the data for it: Reaction 1 Reaction 2 T(initial)T(final)mass of calorimeter (g)mass of MgOT(initial)T(final)mass of calorimeter (g)mass of MgH1H2H3H4Actual DH423.231.6105.6291.00423.543.8100.9740.503-147.758-409.321-285.83-547.393-601.83. The density of the unknown metal was 6.57 g/mL and was determined using a cylinder and displacement. Specific Heat Capacity of a Metal Trial 1 Trial 2 Mass of stoppered test tube + netal 8 B Mass of stoppered test tube 8 Mass of calorimeter B 165.791 115.640 Mass of calorimeter + water R 62.162 42.170 18.236 8 18.252 115.640 8 115.669 165.147 8165.934 so.151 8 50.265 43.926 43.926 21.0 C 21.0 99.) %PDF-1.7 It requires us to create a soda can calorimeter which is a soda can with water inside in order to absorb heat energy and determine the temperature changes of water in soda can. Borneo is known as the largest island in the Southeast Asia which drains through the longest and biggest tropical rivers ( Our tutors provide high quality explanations & answers. Heat: The amount of energy associated with the movement of atoms and molecules in matter. The specific heat of water has the relatively high value of 4.184 J/gK. As the condition of the experiments was kept the same for the groups, the experiment had a high, We rinsed all glassware three times with deionized water then we chilled 200mL of deionized water with ice and heated 200mL of deionized water on a hot plate. It is an intensive property, as opposed to the heat capacity, which is an extensive property that depends on the amount of substance present. Using specific heat of water and the mass of water being used, we can express the above more informatively. BF4d0C(r. Enter the email address associated with your account, and we will email you a link to reset your password. Abstract. 4. The metal was placed in a test tube 5cm high and we got the mass of the empty test tube that was 42.703g and then with the metal in it and it was 72.607g. This is important because our bodies as well as the animals are filled with water, giving the ability for the temperature to remain somewhat stable in our bodies regardless of the surrounding Heat Of Combustion Lab In this lab, we will measure the heat of combustion, or calorimetry . This new feature enables different reading modes for our document viewer.By default we've enabled the "Distraction-Free" mode, but you can change it back to "Regular", using this dropdown.