2. Still sleepy from a late night studying, you take the milk out of the refrigerator and pour it on your lemon juice to milk to make paneer (fresh cheese). As a group, craft a chemical explanation for the fact breakfast cereal. Unfortunately, by the time you notice the funny smell you have already poured clumps of coagulated milk onto your cereal. The last time you saw milk coagulate like that was when you added that spoiled milk coagulates.

2. Still sleepy from a late night studying, you take the milk out of the refrigerator and pour it on your lemon juice to milk to make paneer (fresh cheese). As a group, craft a chemical explanation for the fact breakfast cereal. Unfortunately, by the time you notice the funny smell you have already poured clumps of coagulated milk onto your cereal. The last time you saw milk coagulate like that was when you added that spoiled milk coagulates.

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter11: Chemical Kinetics

Section: Chapter Questions

Problem 11.99PAE: Substances that poison a catalyst pose a major concern for many engineering designs, including those...

See similar textbooks

Similar questions

Substances that poison a catalyst pose a major concern for many engineering designs, including those for catalytic converters. One design option is to add materials that react with potential poisons before they reach the catalyst. Among the commonly encountered catalyst poisons are silicon and phosphorus, which typically form phosphate or silicate ions in the oxidizing environment of an engine. Group 2 elements are added to the catalyst to react with these contaminants before they reach the working portion of the catalytic converter. If estimates show that a catalytic converter will be exposed to 625 g of silicon during its lifetime, what mass of beryllium would need to be included in the design?
From the discussion question from Module 5, recall the chemical equation for the combustion of gasoline (iso-octane, C8H18) is: 2C8H18 + 25O2 ---> 16CO2 + 18H2O This means that 2 moles of iso-octane combine with 25 moles of CO2 to produce 16 moles of CO2 and 18 moles of water. This is important for understanding the impact of fossil fuel use on the atmosphere because burning one mole of fuel adds a lot of CO2. Thinking about this in terms of the stoichiometry, and change in concentration, suppose we had 1.0 mole of iso-octane dissolved in 1.0 m3 of atmosphere. That means the concentration of carbon-containing molecules would be 1 mole per cubic meter. However, ff we burned all that iso-octane and convert the C8H18 into CO2 the concentration of carbon-containing molecules increases. How much does the concentration of carbon-containing molecules increase if 1.0 mole of C8H18 in 1.0 m3 of air is converted into CO2 as shown in the chemical equation above?
Suppose you are brewing beer, and you want to estimate how long it will take to complete the fermentation process. You place1.00 kgof sucrose(MM=342.3 g/mol)and yeast in your fermentation vessel and add water to a final volume of3.50 L. You decide that your reaction will be considered completed when the concentration of sugar decreases to0.0100M. How long will it take (in minutes) from the start of the reaction to the completion of the reaction?
The exhaust systems of cars today are equipped with catalytic converters that uses rhodium and platinum as catalysts. No more than 4-9 grams of these precious metals are used in a single converter. This catalyst speeds up reaction of three types of toxic compounds given off the cars. The rhodium and platinum as catalysts do not enter into a chemical reaction, but the rough surface of the catalyst provides a high-surface area for the reaction to occur. Catalytic converters change unburned hydrocarbons, carbon monoxide, and nitrogen oxides into harmless compound. Why is it not necessary to add more rhodium and platinum to a catalytic converter as these substances are used?
Oxygen gas speeds up the rate at which food is spoiled. To improve the shelf-life of foods, food manufacturers use several methods to remove oxygen from inside the food packaging. In one method, an enzyme is added that catalyzes a reaction between oxygen and glucose which is often present in foods. (glucose + oxygen + water --> gluconic acid + hydrogen peroxide). Why this method may NOT be suitable to improve the shelf-life of all foods?
Calculate the number of pounds of CO2 released into the atmosphere when a 10.0 gallon tank of gasoline is burned in an automobile engine. Assume that gasoline is primarily octane, C8H18,C8H18, and that the density of gasoline is 0.692 g⋅mL−1. This assumption ignores additives. Also, assume complete combustion.
STRICTLY HANDWRITTEN ONLY... do ques 5... needed urgently...
UCI Chemistry researchers, Prof. F. Sherwood Rowland and Dr. Mario Molina werefirst to discovered in 1973 that chlorofluorocarbons (CFCs) were depleting the Earth’sozone layer when released into the atmosphere. Once they reach the stratosphere, Clis released from the CFCs molecules by interaction with UV light. Free Cl atoms areable to react with ozone in a catalytic cycle that converts O3into the more stable O2.It is estimated that a single Cl atom is able to react with∼100000 O3molecules.Although CFCs production was banned in 1996, there are still a substantial numberof motor vehicle air conditioners (MVACs) that use CFC-12 (CF2Cl2) as refrigerant.The average CFC-12 emission rate from operating MVACs has been estimated tobe 59.5 mg per hour per vehicle (Zhang et al.Environ. Sci. Technol. Lett.2017).How much chlorine, in kg, is added to the atmosphere in a year due to 100 millionMVACs using CFC-12 as refrigerant?
What is the role of environmental chemistry in the development of sustainable technologies?
Absorbed from the intestines into the blood, nitrites (NO2-) interact with the hemoglobin of the blood and block its respiratory function, turning part of the hemoglobin (HbFe2+) into methemoglobin (HbFe3+), unable to transfer oxygen from the lungs to tissues. With the formation of a large amount of methemoglobin, oxygen starvation of tissues occurs, which can cause damage to the central nervous system. 10 to 20 % - of methemoglobin (HbFe3+) - asymptomatic cyanosis, 20 to 50% of methemoglobin (HbFe3+) -hypoxia develop, > 50% of methemoglobin (HbFe3+) - the person will die. The body weight of the average person is 60 kg. Blood mass averages 8% of a person’s body weight; blood density ρ = 1,050 g/cm3, the hemoglobin (Hb) content in it is 14 g per 100 ml. molecular weight of hemoglobin 65-68 kg/mol (use 68 kg/mol for calculation). Assume that 1 mole of hemoglobin reacts with one mole of nitrite ion to form 1 NO molecule: HbFe2+ + NO2- → HbFe3+ + NO will a 290 mg dose of sodium nitrite…
Liquid n-Hexane + oxygen react to to form carbon dioxide + water vapor. delta Hr= __? Kj Liquid sodium sulfate reacts with carbon monoxide(g) to form liquid sodium sulfide and carbon dioxide (g). delta Hr =__? KJ
Isopentyl alcohol reacts with pure acetic acid to form isopentyl acetate, the essence of banana oil:C₅H₁₁OH+CH₃COOH⇌CH₃COOC₅H₁₁+H₂O A student adds a drying agent to remove H₂O and thus increase the yield of banana oil. Is this approach reasonable? Explain