Answered: What is the purpose in dissolving yeast…

What is the purpose in dissolving yeast in 38°C water, adding sugar to the yeast water and allowing it to sit for 5 minutes and then allowing it to rise in a warm place for 2 hours?

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter12: Solutions

Section: Chapter Questions

Problem 12.55QE

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Starch contains CC, CH, CO, and OH bonds. Hydrocarbons have only CC and CH bonds. Both starch and hydrocarbons can form colloidal dispersions in water. Which dispersion is classified as hydrophobic? Which is hydrophilic? Explain briefly.
A 1 mL sample of glycogen was calculated to contain 21 µmol (micromole) glucose. To 1 mL of this sample was added 2 mL of 2 M HCl. It was then hydrolysed by boiling the solution for 15 minutes. After boiling the hydrolysate was cooled and made up with H2O to a final volume of exactly 10 mL. The glucose was measured in this solution and found to have a concentration of 340 µg/mL (microgram/milliliter). i) Calculate the mass (mg) of glucose in the 10 mL of hydrolysate. As the 1 mL of glycogen sample was made up to a final volume of 10 mL, this mass of glucose was produced by the hydrolysis of the original 1 mL glycogen sample. ii) Calculate the amount (µmol) of glucose produced by the hydrolysis of the glycogen sample. iii) Calculate the purity of the glycogen used in the sample as % Purity = (moles of measured glucose/ moles of calculated glucose in glycogen) *100 iv) state your answer in a complete sentence. Show your working out such that the marker can easily understand it.…
Does washing your hands with soap help prevent the spread of coronavirus? The structure of soap molecules is like the lipids in the membrane layer of the virus. The soap molecules can surround the virus and remove it from the skin. It is also thought that soap molecules can disrupt the lipids in the membrane and can therefore 'disintegrate' the virus. Sodium laurate is a common soap molecule. It has the formula CHa(CH 2) 10 CO2- Na.. Sodium laurate can be produced from coconut oil and sodium hydroxide. Questions: 1. What are the reactants needed for this reaction? 2. Write down the chemical reaction in the production of sodium laurate. 3. What do you call the process in soap preparation?
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You need to make 100mL of a 0.2 molar sucrose (C12H22O11) solution. How much sugar do you need to mix with 100mL of water?
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A solution of Toluene (C7H8) in 301 g of Cyclohexane (C6H12) has a boiling point of 90.30 °C. What quantity in moles of Toluene are present in the solution? (Cyclohexane Kb = 2.92 °C/m and the boiling point of Cyclohexane is 80.9 °C) ****please explain why we would use Cyclohexane Kb, when we are trying to find Toluene******
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