I'm glad you said "you have to use an ICE table, there is no shortcut around it". I hope everyone understands that the ICE table is THE shortcut itself, which makes the problem solution easier.
@LaTasiaRobinson
5 ай бұрын
I had to do a problem like this and got it wrong because I was supposed to use 1/2 x instead of x during the change. Why is that? I don't know how to decipher between when to use x or 1/2 x.
@RoxiHulet
5 ай бұрын
The number in front of x (1/2 x vs 1 x vs anything else) will always be the same as the stoichiometric coefficient for that molecule. It is unusual to use 1/2 x in an ICE table because it is unusual to use fractions as stoichiometric coefficients, so I’m surprised to hear that ALEKS had an example like that!
@d.herbach_bjj
2 ай бұрын
@@RoxiHulet in the ALEX explanation for the reaction N2+O22NO the ice table setup for change also was 1/2x N2 1/2xO2 and -x for NO. I feel like ALEX is wrong lol it doesnt line up to the explanations in class or here
@RoxiHulet
2 ай бұрын
@@d.herbach_bjj I don’t like it! I wish someone from ALEKS would explain themselves 😂
@rxdntpto
10 ай бұрын
What should I do if both of my values for x after using the quadratic formula are negative? Edit: You just choose the smaller value. I had 4.4 - x from the ICE table that I needed to find x to solve the problem. My x values after using the quadratic equation were -0.934 and -12.715, so both would be positive. I remembered from some other video that someone said to just use the smaller value of x, so I did 4.4 - (-0.934) and got 5.33 M which was correct on ALEKs
@RoxiHulet
10 ай бұрын
Good job!!!!!!! 👏😊
@zainab2868
2 жыл бұрын
Thank you so much, that was so helpful!
@Bepdomize
11 ай бұрын
When calculating the change in the reaction you want to determine whether the reaction shifts to the left or the right by looking at which side of the reaction has a compound with an initial molarity of zero. If the molarity of zero is found on the reaction side, then the reaction shifts to the left making the change in the reactants positive and negative for the products. (and vice versa) Failure to do this and just assigning random negative/ positive values to either side of the reaction for the change can result in a false answer when using the quadratic formula.
@RoxiHulet
11 ай бұрын
Can you provide a specific example for which it is necessary to use -x / +x in a way that is consistent with the direction of the reaction?
@thestoryofdean
6 ай бұрын
@@RoxiHuletI learned you can determine them by calculating for Q, using the initial concentration values. And if Q is bigger than K, then it shifts towards the reactants making the reactants side having the +x
@Linda9982
2 жыл бұрын
Hi Roxy, can you please help me with Using Kf to calculate the equilibrium molarity of a complex Topic on Aleks?
@isabellafarall4097
3 жыл бұрын
What if both x's at the end give us positive values? I have had luck inputting the smaller number but I am not sure if that is the correct way
@RoxiHulet
3 жыл бұрын
Even if they are both positive values, only one of them will make sense when you plug it in to solve for concentration. (Concentration has to be a positive number, which is what I mean by “makes sense”.) Choosing the smaller value is probably safe, but you can always try them both.
@ciennasmith7590
2 жыл бұрын
So it doesn’t matter which ones you make negative or positive in the “change” part of the ice box? Just as long as all products and all reactants have the same sign?
@RoxiHulet
2 жыл бұрын
That is correct, the math will all work out in the end. HOWEVER, there are some ALEKS problems where they start filling in the ICE table for you (this may be one of them, idk, I’m answering your question without reviewing the video). For these ALEKS problems, you need to stay consistent with whatever they have started. For example, if they use negative x for a reactant, you have to stick with that format and also use negative for the reactants in that one particular problem.
@anyaustupkina1240
2 жыл бұрын
@@RoxiHulet w/Aleks and this problem I found it SO USEFUL to make the X positive on the side that you have 0 on. For some reason that works on Aleks. For some problems Aleks flips where the - + Xs go, and it changes the answer. Again, I am not sure the exact science behind on this yet. I just know this is what worked for me.
@RoxiHulet
2 жыл бұрын
@@anyaustupkina1240 It doesn’t change the answer, but it does require you to keep real good track of the negative signs throughout all your calculations. If you keep the positive x with the “zero” part of the ICE table, you won’t have a negative sign to worry about.
@dilnoza2168
2 жыл бұрын
Can you please do these two topics from chapter 15 “Writing a complex ion formation constant expression” and “Using Kf to calculate the equilibrium molarity of a complex”.
@user-gf3gk4os8q
6 ай бұрын
why does aleks tell me in "C" change for the ICE table, the H2 and I2 are positive and HI is negative 2x
@RoxiHulet
6 ай бұрын
Honestly, I am not sure why ALEKS is inconsistent in setting up ICE tables. When you are actually solving an ICE table, it does not matter which side you choose to be -x and which side you choose to be +x. I think it is less confusing for students to be consistent and use the same method each time. And, bottom line, it won't matter how it is set up. That's a long way of saying that I don't know why ALEKS does what it does in this particular concept.
@DCJohn25
3 жыл бұрын
Which calculator do you use, and what is the program that you are using to solve Quads?
@RoxiHulet
3 жыл бұрын
I have a TI-85 which was discontinued a loooooong time ago :) It has a polynomial solver which I usually use to solve quadratics. I also like the quadratic solver at Math is Fun: www.mathsisfun.com/quadratic-equation-solver.html
@DCJohn25
3 жыл бұрын
@@RoxiHulet wow, do you sleep? I noticed the time you posted this... Yes, I used to own an 85 also, and I really loved it. Now I have absconded my sons 84+CE, and I am relearning calculators. So, I went to the referred website and plugged in my problem, but where are my positive and negative answers? Are those the 'Vertex' numbers? I am in Chemistry II, and not a traditional math class, trying to figure out the equilibrium molarity of elements/ions ... 🤔😢
@RoxiHulet
3 жыл бұрын
@@DCJohn25 haha :) Well I also have a son (who also owns a TI 84+CE which was cheaper than my 85) and we stayed up late last night hanging out. It was way past my bedtime 😂 On the math is fun solver, your two answers are the “roots”. If you’re looking at a graph, the answers are the x values where the line crosses the x axis.
@DCJohn25
3 жыл бұрын
@@RoxiHulet I hope you have a way to delete these, b/c I am going to fill this reply block up... :-0 I have an example quad, and when I put it into mathisfun, it does not come out to the same answer... -11.08x^2+3.398x-0.05492. The correct answers are 0.01712 & 0.2896. Mathisfun states something totally different... Why??
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