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Below are described three methods through which breads are leavened (risen). Which of them are chemical changes?
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2. Quick Breads: Flour, water, baking soda (NaHCO3) and a source of acid, are mixed and baked. The baking soda interacts with acids and heat in the batter to release carbon dioxide (CO2) gas, forming bubbles in the mixture.
3. Flat Breads: A mixture of flour and water are exposed to high heat, causing the water to evaporate quickly, forming bubbles in the mixture.
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- In the body, the amino acid valine C5H11NO2(aq)C5H11NO2(aq)reacts with oxygen gas to produce gaseous carbon dioxide, liquid water, and urea, CH4N2O(aq)CH4N2O(aq).List the common products formed when an organic material containing the elements carbon, hydrogen, oxygen,sulfur, and nitrogen decomposes (a) under aerobic conditions, (b) under anaerobic conditions.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…
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- Which of the following is true of reduction reaction? It is the removal of electrons from an atom or molecule. They are also referred to as dehydrogenation reactions An example of which is the conversion of Pyruvic acid to Lactic acid There is a decrease in the potential energy of the atom or molecule Which cells in the body convert most of the remaining fructose and practically all of the galactose to glucose? Sertoli cells Erythrocytes Parietal cells Hepatocytes Which of the following substances can be considered as metabolic intermediates?* Water ATP Pyruvic acid GlucoseThe DIAGRAM below contains FIVE PURE SUBSTANCES with the molecular componentshown per substance. Using this DIAGRAM answer the questions. 1. Which substance CANNOT decolorize bromine water? Substance ASubstance BSubstance CSubstance D 2. Which substance is expected to turn blue litmus paper into red color? Substance ASubstance BSubstance CSubstance D 3. Which substance has the greatest tendency to participate in a chemicalreaction with small chain alcohol in an acidified chemical environment? Substance ASubstance BSubstance DSubstance E 4. Which substance has the highest solubility to hexadecane? Substance ASubstance CSubstance DSubstance E 5. Which substances can react with potassium borohydride, converting theproduct into alkene alcohol (assuming complete reaction)? Substance A and BSubstance B and DSubstance C and DSubstance D and E 6. Aside from London dispersion forces, which substance do you expect dipoleinteractions to be effective? Substance A and BSubstance B and…1 (a) Does doubling the volumes of acid and base double the amount of heat? 1 (b) Does doubling the concentrations of acid and base double the amount of heat? 2 (a) What happens when different amounts of acid and base are used? What happens when sulfuric acid is substitutted for hydrochloric acid?
- The air has a dry ball temperature of 32 °C and a wet bulb temperature of 24 °C is heated in a heater so that the temperature of the dry ball increases to 90 °C. The air is then passed through the corn kernels pile to dry. air that comes out of the pile of corn kernels to dry. The air that exits the corn kernels is at a dry bulb temperature of 60 °C. then this air is passed to the dehumidifier to reduce its RH to 10 %. Draw the course of the process of changing the air on the psychometric diagram. The airflow rate through the corn kernels pile and dehumidifier was 3.0 m/s and the pile cross-sectional diameter was 0.5 m a. determine the amount of water lost from the pile of corn kernels (in grams of water / second) b. determine the amount of water lost from the air when passing through the dehumidifier (in grams of water / second)Aspirin can be made in the laboratory by reacting acetic anhydride (C4H6O3C4H6O3) with salicylic acid (C7H6O3C7H6O3) to form aspirin (C9H8O4C9H8O4) and acetic acid (C2H4O2C2H4O2). The balanced equation isC4H6O3+C7H6O3→C9H8O4+C2H4O2C4H6O3+C7H6O3→C9H8O4+C2H4O2In a laboratory synthesis, a student begins with 2.90 mLmL of acetic anhydride (density=1.08gml−1density=1.08gml−1) and 1.28 gg of salicylic acid. Once the reaction is complete, the student collects 1.20 gg of aspirin. a) Determine the theoretical yield of aspirin for the reaction. Express your answer using three significant figures. b) Determine the percent yield of aspirin for the reaction. Express your answer using three significant figures.Aspirin can be made in the laboratory by reacting acetic anhydride (C4H6O3C4H6O3) with salicylic acid (C7H6O3C7H6O3) to form aspirin (C9H8O4C9H8O4) and acetic acid (C2H4O2C2H4O2). The balanced equation isC4H6O3+C7H6O3→C9H8O4+C2H4O2C4H6O3+C7H6O3→C9H8O4+C2H4O2In a laboratory synthesis, a student begins with 3.10 mLmL of acetic anhydride (density=1.08gml−1density=1.08gml−1) and 1.23 gg of salicylic acid. Once the reaction is complete, the student collects 1.22 gg of aspirin. Determine the percent yield of aspirin for the reaction. Express your answer using three significant figures.
