Into high school
I just found out
Chemical balance moves this thing, and in my son's mouth it's called the prophet. – the lechartley principle says the balance is moving in the direction of weakening change, but he always reverses every time he judges which side is moving。
Last weekend, he made a question: n2+3h2⇌2nh3, reaction heating. Ask where the elevated temperature balance is moving. He wrote a positive move. The correct answer is reverse。
I say it's heating, and the heat should move in the direction of the heat, which is reverse. He said he knew that the heat was moving in the direction of heating, but forgot whether the reaction was to heat or to inhale. Thermal equations are written every time on the draft paper to understand。
Turn to the bottom: increase pressure and balance to which side. He wrote positive. This is right - the number of positive gas molecules has changed from four to two, and the pressure has moved in a direction of less molecules, in a positive direction。
But the third question: where does the inert gas flow under constant conditions and the balance move? He hesitated for half a day to write straight. The answer is to balance. I'm talking about a constant inert air. The total pressure gets big, but the fractional pressure stays the same, and the balance stays the same. You're being deceived by the habit of "pressurizing."。
I asked him to put his pen down and say that we don't talk about new issues today, so let's go over the lechartley doctrine in order. Every time you judge chaos, it's not that you can't remember it, it's that you come up with it. More than one conclusion. We have to follow the process — judge what's changed and decide where the balance goes。
Step one: judge what changed。
Three conditions affect the balance: concentration, temperature, pressure. The question is whether to circle the conditions for changing the subject — whether to add a substance (concentration variation), to warmer temperatures (temperature change) or to increase pressure reduction (pressure change). That step seemed like bullshit, but he had often jumped to the conclusion that the pressure was a matter of temperature。
Step 2: to judge the direct impact of this change on the balance。
Concentrations have changed - the reaction rate has increased immediately and the balance is moving in a positive direction. Adding the generator, the reverse reaction rate increases immediately and the balance moves backwards. Less something, less reaction and more balance to complement it。
Temperature has changed — heating has increased, balancing in the direction of heating. Temperature, balance to heat. The key step here is to determine whether the positive reaction is heat or heat. Look at the thermochemical equation, the radium h0 is responding to heat。
Pressure changed - pressurized, balanced in the direction of less gaseous molecules. The pressure is reduced and the balance moves in the direction of the increase in the number of gaseous molecules. The number of gas molecules before and after the reaction, depending on the gas coefficient on both sides of the equation. Change the pressure balance if the number of gas molecules on both sides is equal。
Step three: pay attention to the trap of "consistent inert air"。
Inert gases flow into constant conditions, the total pressure becomes large, but the fraction pressure of the reaction and the generator remains unchanged and the concentration of the components remains unchanged. The effect of pressure change on the balance is essentially the constant concentration. The concentration is unchanged and the balance is not moving. Inert gas is used under constant pressure conditions, the size of the body becomes larger, the concentration of the components is reduced, which is equivalent to a decrease in pressure, and the balance moves in the direction of an increase in the number of gaseous molecules。
He's using this process to redo the three wrongs. The first warming - the temperature of the condition circle - is reactioning to heat, warming to heat, reverse. The second is pressurized - the pressure of the condition circle is reduced by 4 times the number of active gas molecules, which is moved in the direction of a decrease in the number of molecules. The third is the constant inert gas - the concentration is unchanged and the balance is not moving。
When he was down on the back of his chair, he used to go straight to the last step of thinking that the temperature would increase back and back, and the conditions would be mixed. Now, the conditions, the effects, the final movement, are not messy. The chemical balance was not lost last month。
Okay. Reshetley didn't rely on prophecy. He looked at it first. He welded it in three steps
Does your kid do the balanced movement question, the temperature rise or the constant inert pedal? Talk to the comment section。
The author's introduction: wendford, a regular dad who crawls on the way to school, has a middle school daughter and a high school son. Not to sell anxiety, but to share stupid methods that have been tested in front of their own desks. Keep an eye on me and walk with the kids every step of high school。
# i don't know #High school chemistry# chemical balance moves # remember
