What is the difference between deoxyribonucleic acid and deoxyribonucleic acid

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• 1. The catalyst for the reaction of bromine with benzene is FeBr3. Why is only Fe added in the experiment? In addition, the reaction exotherm, benzene, liquid bromine are volatile, in order to reduce the effect of exotherm on benzene and liquid bromine volatile, the device should have a unique design? The produced HBr gas is easily soluble in water, how should it be absorbed and tested? The catalyst for the reaction of bromine and benzene is FeBr3. Why is only Fe added in the experiment? In addition, the reaction exotherm, benzene, liquid bromine are volatile, in order to reduce the effect of exotherm on benzene and liquid bromine volatile, the device should have a unique design? The produced HBr gas is easily soluble in water, how should it be absorbed and tested?
• 2. Fill the 10ml test tube with mixed gas of NO2 and O2, invert it in the water tank with sufficient water,1, if the water is completely filled in the test tube, The volume of the original gas mixture is? The volume of O2 is? 2. If the last remaining gas is 1ml, the volume of NO2 in the original mixed gas may be? Fill the 10ml test tube with mixed gas of NO2 and O2, invert it in the water tank with sufficient water,1, if the water is completely filled in the test tube, The volume of the original mixture is? The volume of O2 is? 2. If the last remaining gas is 1ml, the volume of NO2 in the original gas mixture may be?
• 3. Two identical thin-walled glass tubes are suspended from the spring scale, and the opening is inserted downward into the mercury tank (the nozzle is not in contact with the bottom of the mercury tank). The tube has a length of h1, h2 mercury column (h1F2 B.F1
• 4. Flask of the same volume is filled with ammonia gas and hydrogen chloride gas respectively under the same temperature and pressure. After the fountain experiment, the water is filled with the flasks. What is the ratio of the concentration of the substance in the flask Flask of the same volume is filled with ammonia gas and hydrogen chloride gas respectively under the same temperature and pressure. After the fountain experiment, water is filled with the flasks. What is the ratio of the concentration of the substance in the flask Flasks of the same volume under the same temperature and pressure were filled with ammonia gas and hydrogen chloride gas respectively. After the fountain experiment, the water was filled with the flasks. What is the ratio of the concentration of the substance in the flask
• 5. Do a fountain experiment with a flask filled with ammonia. When water fills the flask, what is the concentration of ammonia in the flask? A flask filled with ammonia gas is used for fountain test. When water fills the entire flask, what is the concentration of ammonia gas in the flask?
• 6. THERMOCHEMICAL EQU Combustion in Oxygen to Produce Gaseous Water and Nitrogen Dioxide ThermochemicalOCHEMICAL EQU Combustion in Oxygen to Produce Gaseous Water and Nitrogen Dioxide
• 7. At the same temperature and pressure, the same volume of the flask is filled with ammonia and hydrogen chloride gas respectively. After the fountain experiment, the water is filled with the flask. The ratio of the mass concentration of the solution in the flask is—? At the same temperature and pressure, the same volume of the flask is filled with ammonia gas and hydrogen chloride gas respectively. After the fountain experiment, the water is filled with the flask. The ratio of the mass concentration of the solution in the flask is—?
• 8. Use a flask full of ammonia gas for fountain experiment. When the water fills the whole flask, what is the concentration of ammonia water in the flask? (Press... Use a flask full of ammonia gas for fountain experiment. When the water fills the whole flask, what is the concentration of ammonia water in the flask? (Calculated according to standard state)(detailed description)
• 9. Take a dry flask, collect ammonia gas by exhaust air method, and conduct the fountain experiment. When the water is filled to about half of the whole flask volume, the fountain stops. The concentration of ammonia water in the flask is (calculated according to the standard condition)() A.0.045mol • L-1 B.1 mol•L-1 C.0.029mol • L-1 D. Not sure
• 10. Why is nitric oxide rather than nitrogen dioxide produced by catalytic oxidation of ammonia and oxygen?
• 11. Chemical equation for potassium permanganate to oxygen, chemical equation for potassium chlorate to oxygen
• 12. A fine glass tube of 100 cm in length, with one end closed and one end open. When the opening is vertically upward, seal the 49 cm long air column with 20 cm mercury column, as shown in the figure. When the opening is vertically downward, what is the length of the air column closed in the tube? Let the atmospheric pressure be 76 cmHg. A 100 cm long glass tube with a uniform inner diameter. One end was sealed and the other end was opened. When the opening was vertically upward, the 49 cm long air column was sealed with 20 cm mercury. As shown in the figure, when the opening was vertically downward, how long was the sealed air column in the tube? At that time, the atmospheric pressure was 76 cmHg. A fine glass tube of 100 cm in length, with one end closed and one end open. When the opening is vertically upward, seal the 49 cm long air column with 20 cm mercury column, as shown in the figure. When the opening is vertically downward, what is the length of the closed air column in the tube? Let the atmospheric pressure be 76 cmHg.
• 13. Insert the 1m long glass tube with one end closed and uniform opening into the mercury groove 25cm deep downward. When the atmospheric pressure is equal to the pressure generated by 75cm high mercury column, the height of mercury column entering the tube is () A.11.6 cm B.13.4 cm C.25 cm D.38.4 cm
• 14. Which mercury barometer or mercury thermometer can not be used in space
• 15. How much Pa is a standard atmospheric pressure, how much centimeter of mercury, how much water? How much is a barometric pressure, how much centimeter of mercury, how much water? How much is a standard barometric pressure, how much centimeter of mercury, how much water?
• 16. If the mercury barometer contains water instead of mercury, what is the height of the water column in the pipe when the external atmospheric pressure is 101,000 Pa If the mercury barometer is filled with water instead of mercury, what is the height of the water column in the pipe when the external atmospheric pressure is 101,000 Pa
• 17. A certain quality of air is enclosed in a U-shaped glass tube which is still placed in a vertical plane by mercury. The upper end of the right tube is open and long enough. The silver surface in the right tube is higher than that in the left tube by h. The reason why h becomes larger is () A. The ambient temperature rises B. The atmospheric pressure rises strongly by C. Mercury is added to the right tube along the tube wall. A certain mass of air is enclosed in a glass tube which is still placed in a vertical plane by mercury. The mercury surface in the tube is higher than that outside the tube by h. Which of the following measures can make h larger () A. Press the glass tube upward slightly b. Reduce the external atmospheric pressure c. Take the nozzle as the center, and rotate it slightly in the vertical plane by a small angle D. The whole device falls freely. .U-shaped glass tube free fall The U-shaped glass tube falls freely. This is option D of the first question.
• 18. One end of a glass tube with uniform thickness is opened. When placed horizontally, there is a 25cm long mercury column enclosing a 40cm long air column. If the glass tube is opened upward,
• 19. Measure the atmospheric pressure value with Torrecholi test (vacuum is placed on the silver surface inside the glass tube). The following process will cause the measurement value to change: A. Move the test from the foot of the mountain to the top of the mountain. B. Lower the glass tube slightly. C. Tilt the glass tube slightly. D. Use a slightly thicker glass tube The atmospheric pressure is measured by the Torricelli test (vacuum is placed on the silver surface inside the glass tube). The following process will cause changes in the measured value: A. Move the test from the foot of the mountain to the top of the mountain. B. Lower the glass tube slightly. C. Tilt the glass tube slightly. D. Use a slightly thicker glass tube
• 20. When using mercury for Torricelli experiments, the atmospheric pressure outside supports a column of mercury 0.76 m high. What is the minimum length of a glass tube for water? Please use the formula, I know the answer is 10.3m When using mercury for Torricelli experiments, the outside atmospheric pressure supports a column of mercury 0.76 m high. How long would it take to replace the glass tube with water? Please use the formula, I know the answer is 10.3m