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Anonymous users2024-02-11Total number of atoms.
Conservation of mass. 3.Let the volume of concentrated sulfuric acid be x
then 500* is based on the conservation of sulfuric acid mass).
Get x=. then water is needed.
Physics. d, the reason is that the density of alcohol is small, and the buoyancy is also small, so the object should sink.
The heating function and heat preservation function of the electric hot water bottle cannot be used at the same time, first heat and then keep warm, and the temperature is not enough and can also be automatically heated (provided that it can be automatically kept warm).
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Anonymous users2024-02-10Here the same volume of gas has the same number of moles, and the same number of gas molecules can be pushed, and the mass balance of A1 and A is obtained.
2. The total amount of sulfuric acid used in b is inconvenient to column.
x=3454ml
The water level is the same, using Archimedes' law, the buoyancy of the object = discharging the gravity of the water, converting the force into the mass relation, and getting a correct.
dThe density decreases, and the buoyancy of the ball decreases and sinks. 4、
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Anonymous users2024-02-09If a gravitational force of 20N floats on the water, then the buoyancy of the object is 20 N. The weight of the water discharged by the object is 20 n, the volume of the water discharged by the object is 2000 cubic centimeters, and the volume of the object submerged under the surface of the water is 2000 cubic centimeters.
How is the water boiling process different from the water splitting process?
Boiling is the change of water from liquid to gaseous, but it is still H2O
Decomposition is the process by which H2O is converted into other chemicals under certain conditions, and eggs are boiled in ordinary pots in the mountains, but the eggs are not cooked, what is the reason for this? What is the method used to boil eggs?
Reason: The air pressure is low in the mountains, and the boiling point of water is reduced (it used to boil at 100 degrees, but now it can boil at 50 degrees).
Method: Use a pressure cooker for cooking.
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Anonymous users2024-02-08It seems that there really is nothing to explain.
The second explanation is the definition of enthalpy.
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Anonymous users2024-02-07Hello, cpm>0, at a glance, all other answers, I'm a graduate student in chemical engineering, what do you don't understand about physical chemistry, just ask.
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Anonymous users2024-02-06Does this need to be explained......I don't understand.
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Anonymous users2024-02-05At the top, type out some of the questions, and don't have to hit them all. A similar question will appear, or the same.
But I think it's a little better on Google.
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Anonymous users2024-02-04wf (minimum) = - g = 1mol * chemical potential of the initial state of glucose - 1mol * chemical potential of the final state of glucose = 1mol * [(chemical potential of pure glucose + concentration of glucose in the blood of rt ln) - chemical potential of pure glucose + concentration of glucose in urine of rt ln) = = kj (where @ is the difference operator, this process can be regarded as an isothermal isobaric process, and the concentration of glucose in human blood and urine is to be regarded as constant).
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Anonymous users2024-02-03Environmental conditions are not provided by default in the room.
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Anonymous users2024-02-02The original test questions and answers are available in the library.
1 The steel sample to be tested contains 9mg mass fraction= >>>More
The smallest atom in mass is the hydrogen atom.
It's like an upside-down enlargement. >>>More
I don't know what your situation is, but personally, I came to the United States at the end of my freshman year of high school, and then my AP Chemistry and AP Physics were both A's when I was junior, and I learned very easily, if you go to school in China and you can usually get 70 or 80 in exams, there is no problem, Americans think they are difficult, mainly because their understanding is very slow, so they can't understand a question for a long time, like you use the sea of questions tactics in China to pile up, It's so familiar with the formula and the like, so you don't have to worry about it. >>>More
The full formula of junior high school physics can be referred to below. >>>More
First of all, your attitude is worth affirming, on the one hand, you have to learn the ins and outs of knowledge, learn how it came about, how it should be used, and the interconnection between the knowledge points, so as to achieve the real will, on the other hand, pay attention to the summary, science things, thinking and methods are more important than the knowledge points themselves, the purpose of doing questions is to improve thinking, refine methods, not to do questions for the sake of doing questions, and moreover, there is a good way, that is, to tell others the topics you have done, you can tell your classmates, You can also tell parents, if you can explain a problem, it means that you really understand. These things are more active methods, if you can't do them, then you can only use passive methods, that is, repeated review and repetition.