Description This week’s lab focused on preparing a very tricky solution of a given molarity from ammonium chloride. You used analytical balance, worked with specific laboratory tools, and prepared the solution to better understand the relationship between molarity and mass concentration https://youtu.be/lRnJwisvEX0
Description trialsserving size [g]:28 calories/serving:170. initial mass peanut+paper [g]:0.577 and 0.715 mass of weighing paper [g]:0.226/0.222 mass of peanut residue and weighing paper [g]:0.286/0.265 mass of weighing paper [g]:0.229/0.225 initial temperature of water [0C]:20.3/20.5 final temperature of water [0C]:29.7/32.6 volume of water [mL]:200.0/200.0 :
Description Hello I need help with an Electrophilic Aromatic Substitution Report Scaffold for Organic Chemistry. It is due Tuesday night (04/13) at 11:59 pm (pacific time). I have included all necessary information including: - Report scaffold instructions - Report Scaffold Rubric - Class data set that will be used to answer "class data" questions - The entire in-lab that will be used to answer the "individual data" questions. - The General Lab procedure manual
Description NO PLAGIARISM! I need this sent to me in a pdf document. It can not be handwritten! The assignment is below! The PowerPoint/pdf is below in case you need it!
Description I filled out the first page after watching the suggested video and now I am stuck on the rest of the problem(s), any help would be very much appreciated!
Description All Waste can mix together and then go down the drain. Hot plates are located in the ends of each lab bench. You may use a transparent test tube holder for your buffer solutions if one is available. This allows you to more easily compare the colors of the unknown solutions to your knowns. Household chemicals are located at the back table with the cabbage. You can find a few different samples. You do not need to bring your own. https://wamaps3.s3.amazonaws.com/cfiles/23139/121_... Question 1: Data and Observations Part A: Cabbage Indicator pH Color 2 4 6 7 8 10 12 Part B: Cabbage Indicator Substance Color pH Acidic, Basic, or Neutral dish soap shampoo glass cleaner Question 2:Data and Observations Part C: Buffers For this section, you may upload an image of your data tables if you prefer. Files will be graded by hand, separately. Total Number of Drops of HCl(aq) Added DI Water Buffered Solutions Color pH Color pH 0 1 2 3 4 5 Total Number of Drops of NaOH(aq) Added DI Water Buffered Solutions Color pH Color pH 0 1 2 3 4 5 Question 3:To determine the pH of an unknown solution, a student uses adds 10 drops of red cabbage indicator to the solution, but the solution remains colorless. Can the student determine if the solution is acidic, basic, or neutral? Explain. Question 4:Consider other tests you have carried out on acids and bases during the quarter. Suggest another method for determining if the unknown solution is acidic, basic, or neutral. Question 5:What happened to the pH of DI water when the hydrochloric acid was added to it? A.)What happened to the pH of DI water when the sodium hydroxide was added to it? B.)What happened to the pH of the buffered solution when hydrochloric acid was added to it? C.)What happened to the pH of the buffered solution when sodium hydroxide was added to it? D.)Briefly describe any differences or similarities for any pH changes observed for DI water compared to a buffered solution when hydrochloric acid was added to each. E.)Briefly describe any differences or similarities for any pH changes observed for DI water compared to a buffered solution when sodium hydroxide was added to each. Question 6:Consider a buffer solution that consists of two separate components: the weak acid, HF(aq), and its conjugate base, F-(aq) (added as NaF). Which component will react with H+(aq) from a strong acid? Write the net ionic equation for the reaction that occurs when H+(aq) is added to the buffered solution. Which component will react with OH- (aq) from a strong base? Write the net ionic equation for the reaction that occurs when OH-(aq) is added to the buffered solution.
Description Lab 01: Coffee Problem Purpose of Experiment: To perform specific heat calculations and check those calculations using the virtual lab example. Deliverables: A screenshot of the correct answer and all calculations and explanations Instructions: For this lab assignment, you will need to read the instructions for the Metals Density Problem on the ChemCollective website. After you complete this reading, return to this assignment to read an example problem that will help you to complete the lab on the ChemCollective page. Go to lab page: http://chemcollective.org/activities/autograded/115 To complete the lab, all calculations and an explanation of how you will make the coffee must be shown in the provided box below the virtual lab. Once the green check box is clicked and the lab shows you have a correct answer, take a screen shot and submit the screenshot of the lab for your grade. Lab Assistance: The following will help you to complete out the Coffee Problem lab. All glassware used in this lab (even the pipets) must be insulated. Once the coffee and milk are selected, you must change the temperature to the initial temperature and insulate the glassware or it will quickly lose temperature. Hint: the coffee is in an insulated travel mug, so no heat escapes. To insulate a piece of glassware in Virtual Lab, Mac-users should command-click (or open-apple click) on the beaker or flask; Windows users should right click on the beaker or flask. From the menu that appears, choose “Thermal Properties.” Check the box labeled “insulated from surroundings.” The temperature of the solution in that beaker or flask will remain constant. All calculations and an explanation of how you will make the coffee must be shown in the provided box below the virtual lab. Once the green check box is clicked and the lab shows you have a correct answer, take a screen shot and submit thescreenshot of the lab for your grade. Example question and calculation: You decided to make hot water for your favorite flavored tea drink. The water, after boiling, was at about 98 ?C when you poured it over the tea bags. You now have 100 mL hot tea at 98 ?C and want to dilute the tea and bring it to room temperature at about 25 ?C. To make the tea to the correct temperature, you will add a portion of cold water at a temperature of 5 ?C. How much cold water should you add to the hot tea water? (Hint: the density of tea and water is 1 g/mL and the specific heat of tea and water is 4.184 J/g??C). First convert the volume to mass using density: 100mL?1g1mL=100g100mL?1g1mL=100g Next, use the following equation: q=m×C×?Tq=m×C×?T. This problem requires an endothermic and an exothermic reaction; therefore the equation is modified: q=?qq=?q. The cold water absorbs heat and is the endothermic reaction; therefore, the cold water portion is the qq. The tea temperature being brought down is releasing heat and therefore is the ?q?q side of the equation. Now we can substitute the m×C×?Tm×C×?T for each qq, making sure to keep the signs of each qq. (m×C×?T)=?(m×C×?T)(m×C×?T)=?(m×C×?T) (m×C×(Tf?Ti))=?(m×C×(Tf?Ti))(m×C×(Tf?Ti))=?(m×C×(Tf?Ti)) (m×4.184Jg??×(25??5?))=?(100g×4.184Jg??×(25??98?))(m×4.184Jg??×(25??5?))=?(100g×4.184Jg??×(25??98?)) (m×4.184Jg??×(20?))=?(100g×4.184Jg??×(?73?))(m×83.68Jg)=30,543.2J(m×83.68Jg)=30,543.2J m=30,543.2J83.68Jg=365gm=30,543.2J83.68Jg=365g Convert the grams into mL with the density: 365g×1mL1g=365mL365g×1mL1g=365mL Once you have completed the calculation, check you work by doing the virtual lab as explained.
Description For this assignment you will need access to BeyondLabz. I will give you the information needed to get access to the program. In this simulation you will fill a balloon with a mixture of gases, controlling the amount of each gas that you add. You will examine the pressures of the gases in the mixture and demonstrate the relationship between partial pressures and total pressure of a mixture (Dalton's Law of Partial Pressures).
