lab 6

Part D One of these liquids is used as a "blowing agent" in the manufacture of polystyrene foam because it is so volatile. Which liquid would you expect to be used as a blowing agent? Match the words in the left column to the appropriate blanks in the sentences on the right. Reset Help Pentane is used as the "blowing agent" because it has a boiling point and is Ethylene glycol volatile low high Submit Request Answer < Return to Assignment Provide Feedback 6:16 PM O 4) 12/12/2021 amazon B. Mastering. Spotify Free 65°F

You wash a separatory funnel with soap and water to ensure it is clean before extracting an aqueous solution with dicholormethane. You should take the time to make sure there are no drops of water left inside the separatory funnel. Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a True False

The Background section of this lab explains why weight percent (%w/w) can be useful for comparing the relative amount of a desired or "active" compound in different products. During the lab, a major goal will be to decide which of your experiment flasks yield data that would allow you to correctly calculate the %w/w of sodium bicarbonate in these tablets. Let's assume that you correctly choose one flask for this calculation. If the amount of NaHCO3 in that flask was 2.70 g and the original weight of the tablet was 4.60 g, what is the %w/w NaHCO3 in the tablet that went into this flask? GIVE YOUR ANSWER TO TWO DECIMAL PLACES. Your Answer: Answer

Please help do the brown sugar and white sugar separately

PART ONE: Preparation of FECNS* Solution Prepare the two solutions in table 1 by accurately measuring the required volumes of distilled water and CNS into two labeled test tubes. The absorbance of the solutions must be measured soon after adding the Fe" solution from a buret. TABLE 1 Fe 5 ml 5S mL Solution Distilled Water CNS 2 mL Total Volume 3 ml 2 ml 10 ml 3 mL 10 ml In this part of the experiment you are to explore what the above quote means. As a PRELIMINARY Exercise, formulate a hypothesis as to what would happen under each of the following circumstances: 1. 1ml of 0.0020 M CNS' solution is added to the unused portion of solution 1 in the test tube 2. One drop of 0.20 M CNS solution is added to the unused portion of solution 2 in the test tube.

When you collected 50 mL of distillate in the collection flask, the mole percent of water in the distillation flask decreased to approximately 20 mole percent. 95 100 With your simple distillation set-up, what percentage of water will be in the vapor phase at this composition of the liquid? Read the theory page if you don't remember how to interpret the boiling point composition curve. a) 98 mole percent water b) 86 mole percent water c) 92 mole percent water d) 72 mole percent water

Draw the structure of 3-ethylhexane. Show all hydrogen atoms. Select Draw Rings More Erase about us careers privacy policy terms of use contact us help tv MacBook Air DII DD 12 F10 80 888 F9 F7 F8 F6 F5 F3 F4 F2 一 & delete %3D @ #3 $ 7 8 9. 3 4 Y U W E R return K .. .- 8:

Please help with 1, 2 & 3

19. What is thin layer chromatography (TLC) LEAST useful for from the list below? A) To determine if crystallization or distillation may be more effective for a separation B) To determine the number of components in a mixture C) To determine the appropriate solvent for column- chromatographic separation D) To monitor the progress of an organic synthesis reaction 14. The solubility of salicylic acid in water is 7.8g/100ml at 100°C and 0.25g/100ml at 25°. Estimate how much water is needed to recrystallize a 19g sample of salicylic acid? A) 150ml B) 250ml C) 300ml D) 400ml

. Be sure to understand what the dilutionfactor is for each sample (dilution factor = the number used to determine the actualconcentration of the stock UK after the diluted samples are analyzed) ?

Analysis of pure molecules either heterogenous mixture or analysis of pure molecules neither heterogenous mixture nor analysis of pure molecules heterogenous mixture

The unknown organic substances which were critric acid, acetone, urea, beazaldehyda, glycerol, and MTBE was done in an experiment- use this to answer the questions. (Note: there was no boiling point or melting point done in this experiment however their reaction to NaHCO3 was done)   a)Compare what you originally expected to identify at each step of the flow chart to what you identified. Were your predictions close to what you expected? Elaborate on your response. b)What was the biggest challenge you faced in differentiating between the functional groups? Were there any that were difficult to distinguish between? Why? b) Do you think this flow chart could be used to identify functional groups in a molecule that contains multiple different functional groups? Discuss. And how would you improve this flow chart procedure to better identify the organic compoun? (Flow Chart Below)

Answer to c is 1.56g. Please answer bottom question and disregard book pages.

science / chemistry / chemistry questions and answers / can you please answer the second part of... Question: Can You Please Answer The Second Part Of The Question About The Brief Procedure For The Recrystallization Of Benzoic Acid... And Its Overall... Lab Report Follow the standard format for your lab report. Include a calculation of your percent recovery of cinnamic acid based on 85% of your initial material being cinnamic acid and the actual amount of that initial material you weighed. To illustrate your understanding of recrystallization, include a brief procedure for the recrystallization of benzoic acid contaminated with both a little salt and a little sand from water. Benzoic acid is relatively insoluble in cold water, but quite soluble in hot water. Note that you are using only one solvent, so the procedure will be slightly different, and that you have to add a step that is mentioned in the Background section. Can you please answer the second part of the question about the…

5. EXTRACTION To 1 ml. of bromine water in a test tube add .5ml chloroform or carbon tetrachloride. Note the color of the liquid layers. Which layer is more colored? What do you call such liquids which do not form a homogenous mixture? Can you possibly make them homogenous? How? Transfer the mixture into a separatory funnel and add 2 ml. more of bromine water and add 1 ml. more of chloroform of carbon tetrachlorides then shake to effect proper mixing. Let out the lower layer through the stem of the funnel. Again add another 2 ml. to chloroform or carbon tetrachloride to the aqueous solution in the funnel and shake as before. How does the color of the chloroform or carbon tetrachloride layer compare with the first extract? How do you explain the difference? Is it possible that after several extractions the chloroform layer will become colorless? Why?

20,18,2,4,15,15,10 Using these data, construct a 80% confidence interval for the average net change in a student's score after completing the course. Assume the population is approximately normal.  Construct the 80% confidence interval. Round your answer to one decimal place.

A chemical engineering student is testing out various liquids in her lab. She has seven substances: · Substance A: C6H14 (hexane). It is non- polar, mixing well with oil but not with water. · Substance B: H2O2 (hydrogen peroxide). It contains two O-H bonds, and does not mix with oil or hexane. • Substance C: C2H5OH (ethano). Ethanol mixes well with water and hydrogen peroxide. · Substance D: CH3CONH2 (acetamide). It has two N-H bonds. · Substance E: CH3COOH (acetic acid). It mixes well with water, has an O-H bond, and is polar. · Substance F: (CH3)2CO (acetone). There are no O-H bonds, though it is polar. • Substance G: C2H4(NH2)2 (ethylendiamine). Multiple N-H bonds, and mixes well with some polar substances. She needs a substance that will mix well with silanol, SIH3OH, shown below. For safety reasons, she knows it cannot contain nitrogen and it must be able to do hydrogen bonding with other substances. Which substances are okay to use, according to this information?

I need help with understanding these questions. These questions are not writing/researching responses.

Qno3 solve please dont reject. Fill all and asignmnt list also fill dont reject okk

Table 1. Data on EDTA Standardization Weight of CaCO3 (g): 0.2003g Trial Volume of EDTA (mL) Molarity of EDTA (M) 1 8.60 2 8.50 8.55 Average Molarity of EDTA (M)

An enzymatic method for determining alcohol in the wine is evaluated by comparison with a gas-chromatography (GC) method. The same sample is analyzed several times by both methods with the following results (% ethanol). The values of alcohol for both enzymatic and GC methods are shown in Table 1. Using a suitable test, determine whether the enzymatic method gives the same value as the GC method at 95% confidence level.

1. How does steam facilitate the distillation of essential oils? 2. Discuss some applications of simple distillation and steam distillation. Explain why you can use each method for the chosen application Please explain and do not copy from google

Experiment 2 - Extraction   Procedure The procedure[1] has been outlined below. Add details if needed so that you are able to complete the experiment in lab using only this document.      The following chemicals may be encountered during this experiment:   Acetylsalicylic acid Sucrose Acetanilide Ethyl acetate Sodium bicarbonate (NaHCO3) Hydrochloric acid (HCl) Sodium sulfate (anhydrous)     Dissolve phensuprin (0.5 g) in ethyl acetate (25 mL). Measure out 0.5-1.0 g of phensuprin and put it in a beaker (100 mL) along with 25 mL of ethyl acetate. Stir for 1-3 min, breaking up any chunks as needed Sucrose will not dissolve, but everything else will. Gravity filter the solution to collect the sucrose. Set up a glass funnel in a ring or clamp, so that it will drain into a clean Erlenmeyer flask (125 mL). Put a fluted filter paper into the funnel and "wet" it with ethyl acetate. Optional: Weigh the filter paper before using it. Swirl and pour the solution into the funnel, being…