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Recently Asked Physical Chemistry Questions

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Q1: Trial 1 5 Data: 2 3 Table 1. Volumes of reactants used for each trial Trial 1 2 3 4 5 KIO3 volume 1.0 mL NaHSO3 volume Table 2. Experimental data for each trial 1.0 mL Show of 1.0 mL orain 2.0ml 1.0ml Loml H₂SO4 volume 1.0 mL 1.0 mL intorant 1.0ml 2.0L 1.0ML 2cr0 1.0MI 1.0ML 2.0m zevo 1.0 mL H₂O volume [H₂SO4]0 1.0 mL Room Temperature = 19.0°C In [K103] stock = 0.020 M (ml) [K103] = 2010 1.0 mL Starch volume 1.0 mL 91 PRITET DHE 200 1.0 mL [NaHSO3]Stock = 0.030M (mi) [Notiso₂] = final AUT [H₂50₁] = 0.020m "(ml [H₂SQ₂4]final (ml) H₂0 1.0 mL 1.0 mL 1.0 mL Ice-bath temperature = Time (s) (Run 2) Total Volume 5.0 mL 7100 Time (s) [KIO3]0 [NaHSO3]0 (Run 1) 4.01.10 -3M 4.0x1040x10 ³28.015 38.385 30.115 32.175 & QXID-M4.0XID M 4.0x10 3 11.5SS 10.885 10.935 11.12s 4.OKIDM 8.0x10M4.0X10 19.505 21.215 24.33321.685 4.0x10 4.0x108.0 X10 M 21.15s 22.00$ 12.835 20.665 4.0X10 4.0x 104.0x1031.27.9 1:06.75 1:31.80 82.165 M 5.0 mL 5.0 mL 5.0 mL 5.0 mL Time (s) (Run 3) Average Time (s) -1.0°C Calculations: 1. Show the dilution calcu [KI03 ]= 0.000 [KIÖ3]= + Imi starch - Total y = 5.00 ml 0.0 [termine the 10.03 [NaHSO3]=0.0. the reaction ra 5- 100 KI0g added (ast Ime Nukso Ime H₂SO4 IML H₂O Fimi Starch 2. 4.god show work Formula ₁V₁= M₂ Vz [KI0₂]==0.000m (0.020) (0.001) = (0.005)=0.004 moll (ml) = (0.30)(0.005) = (0.0051) = 0.000 mol/L (ml) = (0.30)(0.001) = (0.005)=0.00u mol/L [tb₂s0y + -10:0201 (0.001) = (0.005) = 0.04 mol [NaHsQ3]=0.000M 2. Determine the reaction rates for the following trials. Your answers should contain correct units. You must show work to receive full credit. Rate= (-1/10) X (0-0.004) 132.175=1.24 x 10 m/s Calculations: 1. Show the dilution calculation for Trial 2.) [KI03 ] = 0.020 M (mi) = Trial 2: Trial 3: Trial 4: Trial 5: Rate = (-1/10) x (0-0.004)/11.12=3.59x-5 m/s Rate = Rate (-1/10) x (0-0-004)/21.68 = 1.84x-5 m/s (-1/10) x (0-0.004)120.66=1.93-5 m/s -6 Rate = - (-1/10) x (0-0.004) | 82.16 = 4.86** 3 m/s Ju J to receive full credit. 4. Determination of the Rate Constant at Room Temperature Use the rate law you determined in step 3 to calculate the rate constant (with units) for Trial 1. Report answers in Table 3. Show your work for Trial 1 to receive full credit. Repeat this calculation for trials 2-4 and report answers in Table 3. rate = k [K10₂] (NaHSO3 ] [H₂SO4] 1.24x10-5 = x (0.0040) (0.0040) (0.0040) Table 3: Determined rate constant at room temperature for Trials 1 - 4. 1.24x10-5 Rate constant (k) Trial 1 2 4 Average: elsiu Rate = les brawl sé snutmat moon orb galet sonoo ad adw an dans to moite 2 lanT bns I Isi ni eqmst instal nozeo odi nicigx Sinetenos odt bib worl Write the overall rate law for the reaction using your average rate constant (calculated in Table 3). Report answer with proper units. be sier notion or pets 5. Determination of the Rate Constant at the Lower Temperature Tnal 5 sau 2 b Rupo 2uino IN lainT ni samo ist bevisado y no bons Use the rate law you determined in step 3 to calculate the rate constant (with proper units) for the trial conducted at the lower temperature. Show your work to receive full credit. 5 6 L F X 1 8 Y 8 option 14 G C ( 6 n 0 - H O d K 1 > Determine "c": . Determine "b": 4.0X10-3 8.0v 10-3 A. Determine "a" Thall Tral 2 1.54 x 10-5 3.59x10-5 ? rate= K [ko] [NaHSO3] [H₂SO4 ] 3. Determine the orders using the rate law for the reaction. You must show work in order to receive full credit. ✓ mand # option vale T1 = [K]0₂39 [NaHSO3]b[H₂SO4) C rate Ta X (KIOJ[NaHSO3] [H₂SO4) (4.0x10-3]ª[4.0X10-3 340103] -S 23.59x107 0-5 31.84X107 41.93 x 10-5 5 4.86 x 10-6 Trial [8.0X10-3][4.0×10-³][4.00 1031 1.24x10-5See Answer
Q2: ONCAMPUS Achieve more. UFP Chemistry for Life Sciences: Practical Lab Academic Year 2023-24 Student name ID number Time allowed Instructions Information to candidates 2 hours laboratory time • • • • • • Listen carefully to instructions from the staff members and you should stop immediately if asked to do so. You should work safely at all the time and wear appropriate clothing and safety equipment. If you need help or any additional equipment raise your hand up. Scientific Calculators are allowed. Dictionaries (except electronic ones) are allowed. Before you do your practical, your teacher will explain what you are going to do and might carry out a demonstration - you are advised to listen carefully and take notes. Your teacher will tell you the deadline to submit your lab report. Your lab-report should be submitted through Turnitin (see Assignment Brief for full details) Only use this paper to prepare your lab report which must be done electronically and submitted through Turnitin You must draw your results graph by hand as part of the lab experiment which will be verified by your tutor When including your graph in your lab report submission, this can either be a scan/photo of your hand drawn graph or reproduced electronically using Excel/appropriate software Your Tutor can provide you with graph paper if required INTRODUCTION Temperature and rate of reaction The effect of temperature on rates of reaction. In this experiment the effect of temperature on the rate of reaction between sodium thiosulfate and hydrochloric acid is investigated. When sodium thiosulfate solution is reacted with acid (corrosive), a precipitate of sulfur forms along with a by-product of sulphur dioxide (toxic fumes). The time taken for a certain amount of sulfur to form is used to indicate the rate of the reaction. The effect of temperature on the rate of reaction can be investigated. Before you start work: Na25203 10 40ml • Read all instructions carefully 12 8:00 ひ HC • Write an equipment list from the method below Write a risk assessment and safety precautions Prepare a suitable table to record your data. Method: 1. Measure 10cm³ of sodium thiosulfate and pour it into a conical flask. Mixing 2. Dilute with 40cm³ of distilled water and swirl to mix. Hal 3. Measure 5 cm³ of dilute hydrochloric acid in a small measuring cylinder. 4. Warm the thiosulfate solution in the flask (if necessary) to bring it to the required temperature. (There should be 5 temperatures between 15-60°C) 5. Put the conical flask over a piece of paper with a cross printed on it نفر هامها وقد لام 6. Pour the acid into the flask. START the clock, SWIRL the flask once. 7. Take the initial temperature of the mixture. 4 8. Look down at the cross from above. When the cross disappears, stop the clock and note the time taken. Record the final temperature of the mixture in the flask. ncneed it. Page 2 of 3 10. As soon as possible, pour the solution down the sink (in the fume cupboard if possible) and wash away. 11. 12 11. Repeat the experiment for the other 4 temperatures. 12. Plot a line graph of average temperature against 1/time for each temperature. Hand in your table of results to your tutor. Temperature 820, 30, 40, 50, 60 (°C) نع عليه Temperature and rate of reaction Temp (°C) 20 1202 seconds 332 Time (sec) 60 Rate Time 5:33in 374 (1/time) (sec) 332 30 40 50 60 180 seconds 3:00 1:40 min 100 60 38 secands 180 J 100 38 0.005 Gol 0.0 0102631 time 90.012 when we incres the temperature it & disppear faster Cress 01030 01027 0.024 01021 0.018 Rade time 15 "Gols 0.012 04009 9006 0.003 Temperature and rate of reaction 30 10 20 30 XX 40 50 60 Temperature c/nSee Answer
Q3:2. A rigid vessel contains 2 kg of refrigerant-134a at 800 kPa and 120°C. Determine the volume of the vessel and the total internal energy.See Answer
Q4:/n CHEM 161 Part A Postlab Report Remember that your postlab must be typed and submitted online. The calculations can be handwritten, but they should be inserted into this document (as pictures) when you submit this report. Remember to use the Lab Introduction document to help you throughout the postlab! There are some helpful equations, definitions, and information in the introduction!!! Remember to keep ALL UNITS AND ALL SIG FIGS in mind! 1. Fill in the following table: Trial Initial VHCI Final VHCI Total HCl volume (mL) Molarity of HCI (mol/L, M) Moles of HCI (moles) Moles of NaOH delivered (moles) Initial VNaOH Final V NaoH Total NaOH volume delivered (mL) Molarity of NaOH (mol/L, M) Average concentration of NaOH (mol/L, M) Standard Deviation of NaOH Lab 3 - Titrations concentration Qualitative comments 0.55 25.10 24.55 0.09965 0.10 26.80 26.70 1 10.50 36.10 25.60 28.20 28.00 2 The base much pinker than trial 2 The base is much lighter than trail 1 a. Type out the chemical equation occurring between NaOH and HCl: b. Show your calculation for moles of HCl delivered for Trial 2 1 c. Show your calculation for moles of NaOH delivered for Trial 2 Lab 3 - Titrations CHEM 161 d. Show your calculation for Molarity of NaOH for Trial 2 2 e. Show your calculation for average and standard deviation for NaOH concentration 2. Using your qualitative comments (color), discuss whether your experimentally determined [NaOH] for each of your trials is higher / lower than the true [NaOH]. EXPLAIN your reasoning. (HINT: remember the things that you MEASURED. How were the MEASURED values affected by your observation of color?) The experimentally determined [NaOH] would be than the true [NaOH]. This is because 3. Discuss the effect of each of these "experimental errors" on the calculated concentration of sodium hydroxide (your answer should tell if the experimentally determined [NaOH] would be higher / lower / equal to the true [NaOH]). EXPLAIN your reasoning. See your calculation work to help you think through these! HINT: remember the things that were MEASURED. How were the MEASURED values affected by each of these experimental errors? How do the MEASURED values affect the final calculated [NaOH]? a. A student places 23.56 mL of HCl to the flask, then she spills about 2 or 3 mL of DI water into the flask. The rest of the titration is done correctly. The experimentally determined [NaOH] would be than the true [NaOH]. This is because d. b. A student forgets to rinse the base-buret with base (then dispose of it), and so there was a slight excess of water in the buret when he began titration trial 1. The rest of the titration is done correctly. The experimentally determined [NaOH] would be than the true [NaOH]. This is because C. A student obtains 25.67 mL of HCl, but a few drops of the HCl splash out of the reaction The experimentally determined [NaOH] would be than the true [NaOH]. This is because e. A student overshoots the titration, and the endpoint is a dark pink. They decide not to back titrate and decide to call it "good." The experimentally determined [NaOH] would be than the true [NaOH]. This is because Lab 3 Titrations CHEM 161 Part B 1. Fill in the following table: Acid ID: 2 n= 3 Mass of unknown acid (g) Initial VN₂OH Final VNaoH TOTAL NaOH volume delivered (mL) TOTAL moles NaOH delivered (mol) Initial VHCI (if back titration needed) Final VHCI (if back titration needed) TOTAL HCI volume delivered (mL) (if back titration needed) Moles of HCI added (if back titration needed) Moles of NaOH reacted with added HCI (if back titration needed) Moles of NaOH reacted with unknown acid (if back titration needed) Moles of unknown acid (mol) Calculated molar mass of unknown acid (g/mol) 0.249 12.10 pl 0.10 p2 47.85 pl 2.45 p2 38.10 X X X Trial 1 X X 0.280 0.20 42.52 42.52 X X X X X Trial 2 3 Lab 3 Titrations CHEM 161 Average molar mass of unknown acid (g/mol) Qualitative comments More NaOH than trial 2 Less NaOH than trial 1 a. Type out the chemical equation occurring between NaOH and your unknown acid (either HA, H₂A, or H3A) b. Show your calculation for moles of NaOH delivered for Trial 2 b.5. ONLY IF YOU BACK TITRATED WITH HCl – show your calculations for the number of moles of HCl added, and the number of moles of NaOH that reacted with the excess HCl. c. Show your calculation for moles of unknown acid in Trial 2 d. Show your calculation for molar mass of the unknown acid for Trial 2 4 e. Show your calculation for average molar mass of the unknown acid 2. Using your qualitative comments, discuss whether your experimentally determined molar mass for EACH TRIAL is higher / lower / equal to the true molar mass. EXPLAIN your reasoning. HINT: remember the things that you MEASURED. How were the MEASURED values affected by your observation of color? The experimentally determined molar mass of the unknown acid is of the unknown acid. This is because 3. Discuss the effect of each of these “experimental errors" on the calculated molar mass of the acid. Discuss whether the experimentally determined molar mass would be higher / lower / equal to the true molar mass. EXPLAIN your reasoning. than the true molar mass HINT: remember the things that were MEASURED. How were the MEASURED values affected by each of these experimental errors? How do the MEASURED values affect the final calculated MMacid? The experimentally determined molar mass of the unknown acid would be molar mass of the unknown acid. This is because a. A student dissolves the unknown acid in 60 mL of water, then she spills about 2 or 3 mL of extra water into the flask. The rest of the titration is done correctly. than the true The experimentally determined molar mass of the unknown acid would be molar mass of the unknown acid. This is because b. After dissolving the unknown acid in water, and after doing the titration, the student notices that there is some solid acid stuck to the side of the flask that never made it into the titration solution. than the true Lab 3 Titrations CHEM 161 5 c. A student overshoots the titration, and the endpoint is a dark pink. They decide not to back titrate, and decide to call it "good." The experimentally determined molar mass of the unknown acid would be molar mass of the unknown acid. This is because than the true Lab 3 TitrationsSee Answer
Q5:QUESTION: What is the mixed-% (mass/Volume) of a sulfuric acid solution with a normality of 2 N? The molar mass is 98 g/mol.See Answer
Q6:Q25. You hear the pitch of a fire truck becoming higher and higher. Is this fire truck coming towards you or moving away from you? Explain your answer.See Answer
Q7:Q22. Find at least two other musical instruments that are based upon standing waves with both ends open and describe them in your own words.See Answer
Q8:Q21. Find at least two other musical instruments that are based upon standing waves on strings with both ends fixed and describe them in your own words.See Answer
Q9:Q20. What is the relationship between wavelength and frequency of a wave? Standing Waves and Musical Instruments Watch the following animations of wave interference: constructive interference and destructive interference Constructive Interference (click the link below) Destructive Interference click the link below Constructive Interference Destructive interference Watch the following animations of wave reflection at a feed end and wave reflection at an open end Wave reflection at a fixed end. (click link below) Fixed end Wave reflection at an open end click link below Open end Watch this introduction to a standing wave and as well as the following three videos standing waves on a string with both ends fixed in a flute with both ends open, and on a thumb piano with one end fixed and one end open 1. Standing wave video (click on link): Standing wave link to video 2. Standing wave with both ends foed (click on link): Standing wave with both ends fowed link to video 3. Standing wave with both ends open (click on link Standing wove with both ends open link to video 4. Standing wave with one end fixed & one end open click on link: Standing wave with one end fixed and one open link to videoSee Answer
Q10:Q19. Describe the meaning of the following quantities and include in which unit the respective quantity is measured: wavelength, frequency, period, displacement, and wave speed.See Answer
Q11:Q18. In outer space you could see a distant explosion (separated by space), however you would not hear the explosion. Explain why this happens based upon your knowledge of wave propagation. Characteristics of Waves There are several quantities that characterize periodic waves including wavelength and frequency. Watch this video to find out more about these characteristics and answer the following questions. Amplitude, period, frequency and wavelength of p Amplitude Reak on Penodic Wave Properties of periodic waves -Trough AcademySee Answer
Q12:Q17. Explain in your own words what longitudinal waves are. Include examples. Electromagnetic and Mechanical Waves In the video the string was a medium for our transverse waves and the particles being compressed was the medium for the longitudinal waves. Not all waves require a medium to travel through Electromagnetic Waves may travel (or propagate through a medium, but do not require one they can travel without a medium eg through a vacuum) Lightwaves are electromagnetic waves and therefore do not require a medium to travel Other examples of electromagnetic waves include radio waves, microwaves, and X-Rays Mechanical Waves require a medium to travel through Sound waves are mechanical waves and require a medium to travel through Other examples of mechanical waves are ocean waves and seismic waves generated by earthquakesSee Answer
Q13:Q16. Explain in your own words what transverse waves are. Include examples.See Answer
Q14:Q15. When you charge your cell phone you use a special plug. What is this device called, what does it do, and why is it necessary? Types of Waves As we think of waves, there are several terms that come to our minds that we recognize from everyday life sound waves light waves water waves earthquake waves microwaves radio waves wavelength amplitude of a wave period of a wave frequency of a wave wave propagation standing wave sinusoidal waves rectangular waves longitudinal waves transverse waves As scientists, we look for ways to categorin waves and combine those types of waves together that have similar characteristicsSee Answer
Q15:Q14. Describe the difference in the flow of electrons between AC and DC circuits.See Answer
Q16:Q12. In a DC circuit, why are the electrons repelled from the negative terminal and attracted to the positive terminal?See Answer
Q17:Q11. Find in your household at least three appliances and/or tools that use electric energy to produce mechanical energy. Hint: Most appliances and/or tools convert electric energy into rotational kinetic energy. AC and DC Direct Current (DC) • Electrons flow in one direction through the circuit and/or wires. Produced by solar cells and batteriesla battery is a combination of chemical cells) > Electrons flow through the circuit starting at the negative terminal (which repeis the elections to the positive terminal fic Alternating Current (AC) > Electric current from the outlets in your home school, or work are alternating current AC is usually produced by a generator using the principle of electromagnetic induction which attracts the electron In a generator, either the magnet or a coil of wire spins. Because of this the generator's terminals switch for alternatel between positive and negative Electrons are repelled by the negative terminal and attracted to the positive terminal. Since the two terminals are constantly switching (positive to negative and back to positive the current keeps changing direction (alternating.See Answer
Q18:Q10. Find out what different power plants use to convert energy eventually in the last step into electric energy and report your findings here.See Answer
Q19:Q9. What is the definition of core as it relates to electromagnets? What was the core in the electromagnet you built? Electric Motor and Electric Generator The electric generator and the electric motor are two devices that transform one type of energy into another type of energy The Electric Generator In the case of the electric generator, mechanical energy in this case the rotation of a coil performed by a person is comverted into electric energy-the light bulb shines bright The Electric Motor In the case of the electric motor, electric energy-from the battery current flows through the coil of wire also called the armature-is converted into mechanical energy-the rotation of the coil in the magnetic field due to the magnet below.See Answer
Q20:Q6. How many paper clips can each electromagnet pick up? Procedure il Place a nail through the coil and test each coil again the way you did in Procedure Place two nails through the coll and test each coll again the way you did in Procedure Place three nails through the coll and test each call again the way you did in ProcedureSee Answer

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TutorBin believes that distance should never be a barrier to learning. Over 500000+ orders and 100000+ happy customers explain TutorBin has become the name that keeps learning fun in the UK, USA, Canada, Australia, Singapore, and UAE.