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What is the micro explanation of the work done by current
Electrons collide with other molecules by directional movement, which accelerates the molecular motion and increases the temperature
What does it mean that the drug will be together sooner or later in the drug manual
According to the drug instructions, the medicine should be taken in the morning and in the evening. Does it mean after breakfast and after dinner? Or do you take it in the morning and before going to bed at night? Can you take half of the medicine after dinner?
Macroscopic and microscopic explanation of the law of conservation of mass
How to explain the law of conservation of mass from macroscopic and microscopic aspects
Macroscopically: the types of elements remain unchanged, the mass of elements remains unchanged, and the total mass of reactants and products remains unchanged
Microcosmic: the type of atom is invariable, the mass of atom is invariable, the number of atom is invariable, and the mass is conserved
Explain why chemical reaction should obey the law of conservation of mass from microcosmic point of view
Chemistry studies the combination, separation and recombination of atoms from the atomic level. In all chemical changes, the total number of atoms and each individual atom do not change, and each atom has no loss of mass (different from nuclear fusion and fission), so the total mass is conserved
RELATED INFORMATIONS
- 1. The law of conservation of mass is the basic law of nature. Please explain why there is the law of conservation of mass from the micro point of view
- 2. The solid mass increases after combustion 2. The solid mass decreases after heating with potassium permanganate They are explained by the law of conservation of mass
- 3. There is a bulb and a 20 ohm resistance ro. The ammeter is connected in the circuit. S1 controls the bulb and S2 controls the resistance ro. When the switch S1 is closed, S2 is disconnected There is a bulb and a 20 ohm resistance RO, and the ammeter is connected in the circuit. S1 controls the bulb, and S2 controls the resistance ro. When switch S1 is closed and S2 is disconnected, the bulb and ammeter are connected in series, and the sliding rheostat is modulated to make the bulb turn on and off normally. At this time, the current indication is 0.3A. When switch S1 is opened and S2 is closed, R0 and ammeter are connected in series, and the position of sliding rheostat is unchanged, and the indication of ammeter is 0.2A, Calculate the rated voltage and power of the bulb
- 4. A circuit consists of an ammeter, a battery pack, two small bulbs (same power), a switch and several wires Connect two small bulbs in parallel and connect them to the two positive terminals of the ammeter. After the circuit is connected, close the switch. What's the consequence? It's better to have a picture On the second floor, please be more specific
- 5. In the series circuit, Xiao Ming wants to explore the relationship between current and resistance in a circuit. Now there are wires, switches, ammeters, voltmeters, sliding rheostats
- 6. The measurement and application of electric conductivity Physicochemical experiment
- 7. What instrument can measure resistance and resistivity?
- 8. What is the relationship between voltage, resistance and current in series and parallel circuits? What is bigger, what will become bigger? What gets smaller, what gets smaller? And in series or parallel sliding rheostat resistance increases, the current and voltage will have what kind of change? If the resistance decreases, what will the current and voltage change? Sorry to bother you.
- 9. Voltage of series parallel circuit In a series or parallel circuit, what is the relationship between the voltage of the power supply and the voltage of the trunk and branch in the circuit? That is, the relationship between the voltage of the power supply and the voltage of the branch and trunk?
- 10. Junior high school physics questions about the range of resistance, voltage and current As shown in the figure: (I don't want to insert the picture, just say it) the sliding rheostat is connected in series with the resistance R0, the voltmeter measures the sliding rheostat voltage, and the ammeter measures the main circuit current ——————————————————————————————————————— When the switch is closed, when the slide P of the sliding rheostat slides back and forth between certain two points, the indication range of the ammeter is 0.1.5 a, and the indication range of the voltmeter is 6 ~ 3 V. then the power supply voltage is A.6 V B.7.5 V C.9 V D.15 V
- 11. If the decline of the price of product a causes the supply curve of product B to move to the left, then () A. B is a substitute for a B. B is a joint product of A C. The demand of a decreases and the supply of B increases D. The supply of a decreases and the demand of B increases
- 12. Micro interpretation of earthquake I know that the energy source of earthquake is the powerful internal energy of the earth, but what is the reason for its energy release? Why is there such energy? Why are earthquakes prone to occur between continental plates? Who else can explain earthquakes from the microscopic perspective of physical science? All ears
- 13. How to judge the short circuit If the potential on a wire is not equal, is there a short circuit? What is it? Under what circumstances, a short circuit will occur. I want the truth. Don't worry, I can't understand it
- 14. 3. As shown in the figure, I and II are the divergent rays of the light source s (not shown in the figure) on the principal axis PQ of the lens after being refracted by the lens. In the figure, l is the position of the lens, O is the optical center of the lens, and m is the intersection point of the opposite extension lines of the two rays () A. if the luminous point s is on M, the transparent mirror is a convex lens B. if the luminous point s is on the left side of M, If s is on the right side of M, the lens is convex D. lens L must be concave
- 15. What is the unit of resistivity and conductivity? How to calculate What's the difference between pure water conductivity and conductivity? What's their unit? How to calculate? M Ω. Cm help me to explain his unit name. And μ s / cm unit name explanation?
- 16. "The hydraulic resistivity is 18.2m Ω. Cm", what does m Ω. Cm mean? What does cm mean?
- 17. If you use an electric stove to boil water, the electric stove wire turns red, but the copper wire connected to the electric stove wire is not very hot. Why?
- 18. How to calculate the DC resistance of electric furnace wire? Well, under rated working conditions, what is the current of 220v3000w AC furnace wire? If you add 220V DC, what are the power and current? Inductance needs to be considered. Because I want to calculate and intercept a section of power for 110V discharge, up to 1000W.
- 19. The internal resistance of the generator is r = 0.1 ohm, the load resistance is r = 22 ohm, the current in the circuit is I = 10a, and the resistance of each connecting wire is RL = 0.1 ohm What is the electromotive force of the engine What is the output power of the power supply What is the power of the engine
- 20. If the arc AB is 1 / 3 of the circumference, what is the resistance between ab? If point a is fixed and point B is optional on the circumference, what is the maximum value of resistance between ab?