Lab 6-1

Volumetric pipettes are designed to deliver a very precise amount of liquid, but only if you O a. submerge the end of the pipette into the solution you are delivering. O b. allow the pipette to drain freely, and leave any residual solution in the pipette. C. use the bulb to blow out any residual liquid left in the pipette. O d. hold the pipette at a 45 degree angle and ensure that all the liquid is delivered.

Place 5 mL of starch solution in a test tubes. Heat the test tubes to boiling and add  1 mL of saliva, Cool and then continue heating but keep the fthe  test tube in a water bath at temperature of 40oC   At 5 minutes interval for 30 minutes take a drop of the reaction mixture from each test tube and test with Iodine solution (use a spot plate for the test and stir the contents of the test tube before taking a drop). Tabulate the results. Please Answer the I badly needed this Minutes Color of Saliva Extraction with Iodine   Testtube (40 degree Celcius) 3   6   9   12   15   18

URGENT!!I will rate, pls need this. no need of long explanation.

Please help do the brown sugar and white sugar separately

Help

Volumetric pipettes are designed to deliver a precise amount of liquid, but only if you a. submerge the end of the pipette into a solution you are delivering. b. allow the pipette to drain freely, and leave any residual solution in the pipette. c. hold the pipette at a 45 degree angle and ensure that all the liquid is delivered.

The chemical which reacts with  HCHO to produce a harmless material called urotropin is ___. This can be used to neutralize a large spill of HCHO.     cavity fluid     ammonia     paraformaldehyde     bleach

a. Procedure Obtain a petri dish filled with agar. Measure the initial width of each hole in the agar and record below. Place 1 drop of potassium permanganate in one hole of the agar. Now place 1 drop of methylene blue solution in the second hole. Then, at 15-minute intervals (for a total of 45 minutes), measure the diameter of the colored circles that form around the holes. (Scrape the contents of the used plates into the hazardous waste container provided. Discard Plastic Plates.) b. Results Time (min) 1.5 30 45 methylene blue Diameter (mm) -2MM. 3mm •4mm •5mm - 73 potassium permanganate Diameter (mm) 3 mm -4mm •6mm • Emms

Next lab will involve an indirect method for determining the density of the various sucrose solutions. What are the principles involved for this indirect method? How does the calculation differ from the direct method?

Melting point start 54 and stop 59. was your product pure?

Chapter 8 lab detecting diffusion

Just need G and F please

Please help ethanol and water distillation lab!

Chrome File Edit View History Bookmarks People Tab Window Help Bb LX Bb Bb 台 h + A labflow.com/app/course/362/report/7684#tab=REPORT : Apps B5 Blackboard Mail - Ava Schied... OUAConnect e Biology Syllabus >> REPORT SUMMARY Water Cyclohexane tF KMN04 Soluble Insoluble 12 Insoluble Soluble Sucrose Soldole Insoluble Vegetable oil Insoluble Soluble Electrolytes Lightbulb observation for 0.1 M NaCl Bright glow Lightbulb observation for 0.1 M sucrose No light Lightbulb observation for 0.1 M HCI Bright glow Lightbulb observation for 0.1 M acetic acid (HC2H302) Dim glow Lightbulb observation for 0.1 M NaOH Bright glow Lightbulb observation for 0.1 M NH,0H Dim glow Lightbulb observation for 0.1 M ethanol (C2H5OH) No light Concentration Mass of empty evaporating dish (g) 27.761 Volume of NaCl solution (mL) 9.9 Mass of evaporating dish and NaCl solution (g) 38.770 Mass of evaporating dish and dry NaCl (g) 29.450 OCT 3 T W

(Please show step bys step process.) In paper recycling, scrap papers are torn and immersed completely in water. The solution, which is 20% dry scrap paper, is let undisturbed for about 8-12 hours and then blended (this becomes the paper pulp). Eight grams of starch is added for every 92g of pulp to help the pulp hold together better as it dries into paper later on. Arter addition of starch, the solution was dried such that the final solution will only contain 3% water. Calculate how many grams of the dry paper needed to make 100g of nearly dry paper.

Procedure:1. Mix the flour, sugar and one cup of warm water together in the bottle.2. Cover the top of the bottle with the balloon, and then observe for a few minutes.3. Add the yeast to the remaining half cup of warm water in the glass.4. Remove the balloon and add the yeast-water mixture to the bottle. Stir the mixture using barbequestick.5. Seal the bottie by putting back the balloon. Observe every minute.Question for Analysis: 1. What did you observe after the yeast was added to the mixture?2.Yeast contains enzymes. Why enzymes considered catalysts?

Chemistry How to increase storage and shelf life of ready to drink bottled sorghum porridge using stabilizers ( state names of stabilizers to use and the amounts to add) or any other ingredients to use so that sedimentation or settling of dispersed particles is prevented without hindering the taste of the porridge so that the porridge can be sold in the market?

Answer questions 1 and 2 according to the data given. Date: Weight of cream is 326 kg Table shows some data obtained directly from Lactascan instrument. Fat % SNF % Lacto- density 27.32 30.23 Raw milk 4.15 7.97 Skim milk 0.08 8.26 Q1. Calculate lat percent of cream A) 46 B) 28 (C) ID D) 0,046 Q2. Calculate efficiency of the cream separator. 1) 100% B2% C) 97% E) 87.2% amount 2500 L ** E) 0,28

Procedure 1. To 5 ml of permanent hard water, add 2 ml of sodium bicarbonate, NaHCO3, solution. Filter. To the filtrate, add soap solution. Write the reaction involved. 2. To 5 ml of permanent hard water, add 1 ml of soap solution. Compare the results obtained from procedures 1 and 2. Compare the amount of bubbles and precipitate formed. 3. Boil 5 ml of temporary hard water and add 1 mL soap solution. 4. To 5 ml of temporary hard water, add 1 ml soap solution. Compare the results obtained from procedures IIl and IV. Compare the amount of bubbles and precipitate formed. Question 1. What is the precipitate formed from the reaction of permanent hard water with sodium carbonate? Write the balanced chemical reaction involved.

please sir shortly answer these two questions

please answer all w

Solve correctly please. Will rate for correct ans

10. Which is a way to induce crystal growth if no crystals are forming upon a. scratch air-liquid interface on flask with a glass rod or spatula b. add a seed crystal c. boil off excess solvent volume d. all options are possibilites

Anion Test - Nitrate (NO3‾) Procedure : Mix H2SO4 4 M into 5 drops of NO3‾ solution (NaNO3 0.5 M) until the solution become acidic (check with litmus paper). Add 5 drops of FeSO4 0.1 M and 2 mL of 4 M H2SO4. When adding in the 4 M H2SO4, make sure the test tube in the position 45°, so that the sulfuric acid can flow through the wall of test tube and form a different layer at the bottom part of the test tube.   Results : NO3- solution after adding H2SO4 becomes acidic and is checked by litmus paper and has turned into red colour. Clear solution is obtained at the bottom of the test tube.   What is the Chemical equation involved and Discuss the Nitrate test?

Shelby Thomas - Dr. Warrick--lay x - Shelby Thomas - Winesett-- Lay resentation/d/1hH1ZcyareTSe8se5_uf9F3JaWOelMBbijF5vifp1Eks/edit#slide=id.ge87bdf15c6_0_71 O Present 2 Share ett-- Layers of the Atmosphere Escape Room Last edit was 3 minutes ago mat Slide Arrange Tools Add-ons Help T O- O - Background Layout- Theme Transition 1 2 3 4 S 6 7 8 9 Level 4 Q1 Which layer of the atmosphere is where birds and aircraft fly? A. Mesosphere B. lonosphere C. Stratosphere D. Troposphere ck to add speaker notes 9:33 AM 8/30/2021 prt se home end insert delete Y 立

Explain why an 85 year-old woman with Alzheimer disease might be at higher risk for subdural hemorrhage than a 25 year-old woman, given the same head injury due to a fall from standing. Edit View Insert Format Tools Table 12pt v Paragraph I

ACTIVITY 7

Watch Gilmore Girls | Netflix reynag20@yahoo.com - Yahoo x a ALEKS A ALEKS - David Teague - Learn x O Careers - Country Club of Lan www-awu.aleks.com/alekscgi/x/lsl.exe/1o_u-IgNslkr7j8P3jH-IvdWKW_BBZZ16tTytly4Fcfu6zOtOf8oMM9sEf0BcW45qMn8eRs1Wu6J6nLI8-C.. O ☆ O Spotify Web Playe... M Common Ethical D. O THERMOCHEMISTRY Using specific heat capacity to find temperature change Daw O 3/5 A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 9.60 kg of water at 20.7 °C. During the reaction 109. kJ of heat flows out of the flask and into the bath. Calculate the new temperature of the water bath. You can assume the specific heat capacity of water under these conditions is 4.18 J'g 'K answer has the correct number of significant digits. -1 Be sure your °C ロ Exlanation Check © 2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Acces 29 の II

Calculate theoretical yield for the synthesis of aspirin.

Name Lab Instructor Date Report Sheet Experiment 6 Determining the Formula of an Unknown Hydrate A. Identification of True Hydrates Water Color Color of True Color of solution before heating Compound hydrate after adding (Yes/No) droplets of the solution after residue after water to the heating (Yes /No) heating residue Nickle(II) chloride Sucrose Cobalt(II) chloride Potassium chloride

Nitrous Acid Test Procedure: Make a solution of  4 grams NaNO3 in 16 mL water. Put 2 mL of concentrated hydrochloric acid into a 10x75-mm test tube and add 0.5 ml of amine. Cool the solution in a water-ice slush to zero degrees celcius. Add the nitrile solution slowly, dropwise, until a drop of the reaction mixture gives a blue spot on starch-iodide paper.  The following should be tested: (NOTE: Include the observations and reaction equation) A. PRIMARY ALIPHATIC AMINES (Like Butylamine of Cyclohexylamine) B. PRIMARY AROMATIC AMINES I. Aniline + nitrous acid; then heat. II. Aniline + nitrous acid; then B-Napthol.

For liquid water list all IMFs that have to be broken for it to mix with acetone