Homework Help

Carbon are 4 valence electrons and Oxygen has 6. So C being sextet is -2 charged ?

Example CH3CH2COCH2CH3 How do we know that CO has a double bond

Firstly there are what seems to be typos, H has negative charge the latter inverse equation are X instead of H in denominator. Question solubility is for individual ions for salt they is solubility product Ksp ? What is S [f S] and why that equalts to Ksp and S^2 {KS/(Ks + H)} and how is that equal to S = {Ksp (H + Ka) / KA}^1/2 I took me 2+ hours to try and understand this but still don't get it.

If yes what does this mean ? What would the graph look like ?

What makes me think this - Here RHS is substracted from both sides and x^2 terms are also combined. then both sides are multiplied by -1 that seems like cheating, just flipping signs.

Book says - "(f) Enthalpy of Dilution It is known that enthalpy of solution is the enthalpy change associated with the addition of a specified amount of solute to the specified amount of solvent at a constant temperature and pressure. This argument can be applied to any solvent with slight modification. Enthalpy change for dissolving one mole of gaseous hydrogen chloride in 10 mol of water can be represented by the following equation. For convenience we will use the symbol aq. for water HCl(g) + 10 aq. → HCl.10 aq. ∆H = –69.01 kJ / mol Let us consider the following set of enthalpy changes: (S-1) HCl(g) + 25 aq. → HCl.25 aq. ∆H = –72.03 kJ / mol (S-2) HCl(g) + 40 aq. → HC…

Yesterday was my periodic school test in science, and one of the questions asked: “What type of reaction occurs when fuel or gas burns?” I wrote "combustion reaction" as my answer, but the teacher marked it wrong and said the correct answer is "oxidation reaction." According to NCERT Class 10 Science, the main types of chemical reactions listed are: Combination Decomposition Displacement Double Displacement Oxidation Reduction (and Redox) While combustion isn't listed under the core classification, NCERT Chapter 6 (on combustion and flame) clearly defines combustion as a reaction where a substance combines with oxygen to release heat and light — i.e., exactly what happens…

Basically an object is being pulled by force of 150 N from both sides. The question asked to calculate magnitude of force? The question did not explicitly mentioned whether it is the net force or the total applied force. So I assumed it is the magnitude of total applied force 150 + 150 = 300 N Isthe answer correct as in the question it was not explicitly mentioned and I do know that net force is 0 N

I need help solving this, i tried copying the table but it got disfigured here, here is the link (https://en.openprof.com/wb/measurement_problem_2?ch=3903) to the question page to see it better "Complete the table: Physical quantity Quantity label Base unit Name of the base unit Measuring device time m …

What is position +sec x time

Hi - I'm struggling to understand the attached question from a take home lab. If anyone has suggestions, clarification, or explanation - I would greatly appreciate it. Thank you

Just wondering if anyone is able to help me with this biology question. When you get an infectious disease you may get a temperature. This is a way your body defends you as many microorganisms cannot reproduce at high temperatures. However, people always try to bring the temperature of an ill person down. Explain why this may be the case. (4marks) I have absolutely no idea where to start here..

So, I had thread. The thread was under some different account in mid 2024 when I was studying at Austin Peay college Tennnessee usa (because I know some viddyers of this site are in some backwater country and it's unfortunate that even with computer tech we can't universalize our tech due to foreign "computer science"). Anyhow, if you have a Galileo or a Newton in 2025, which you do, you'll have link to youtube channel removed still, hopefully. but the issue is that some arbitrary mod can shut me down instantly even though obviously I'm the only one with pre-decidedly accurate knowledge of AI. Real AI, not this shit about China being spewed by Trump. So go to trash c…

"An unmarked police car, traveling a constant 90km/h, is passed by a speeder traveling 140 km/h. Precisely 1.00 s after the speeder passes, the police man steps on the accelerator. If the police car's acceleration is 2.00 m/s^2, how much time elapses after the police car is passed until it overtakes the speeder (assumed moving at a constant speed)?" blew my mind away

Hello, I am an AP Research student at Texas. For reasons unknown, I decided to make my research project an online experiment involving children aged 8-12. This is really hard, given the need for the IRB, and the difficulty of distributing the experiment. Basically, children aged 8-12 will fill out a survey on age compression, watch 6 Instagram reels that are kid friendly, and then do the same survey, and I'll see if there is a quantifiable difference in the rating system of each question. I recognize now that it would be so much easier to do something like a metanalysis, or an experiment without human subjects, especially minors, but too late to back out now. My question …

Prove that groups of even order contain at least one element (which is not the identity) that squares to the identity. In case of a cyclic group, it is easy. Such group consists of {e, g, g2, g3, ..., gn-1} and contains element h = gn/2. This element, h2 = (gn/2)2 = gn = e. But how to prove it when the group is not cyclic? P.S. Oh, got it. Just count the pairs, element and its inverse.

I.e., show that A4 has a normal subgroup. I did it by brutal force and would like to know if there is a more elegant way. My solution: A4 consists of 4!/2=12 permutations: e = identity, 8 permutations of the kind (1 2 3)=(1 2)(2 3), (1 3 2)=(1 3)(3 2), etc., and 3 permutations with separated cycles: a = (1 2)(3 4) b = (1 3)(2 4) c = (1 4)(2 3) Because of the separation, the cycles in a, b, and c commute, and thus a2 = b2 = c2 = e. I've checked manually that ab = ba = c, ac = ca = b, and bc = cb = a. So, {e, a, b, c} is an abelian group. An abelian subgroup is normal. Thus, A4 is not simple. Let me know if an…

Show that Sn is isomorphic to a subgroup of An+2. I will demonstrate my idea for n=3. S3 has 3!=6 permutations, 3 odd: (1 2), (1 3), (2 3); and 3 even: identity, (1 2 3)=(1 2)(2 3), (1 3 2)=(1 3)(3 2). Let's consider them separately. Put elements 4 and 5 in A5 aside. Identify even permutations in S3 with permutations in A5 with the same cycles as in S3 while the elements 4 and 5 are fixed, e.g., (1 2)(2 3) in S3 ↔ (1 2)(2 3) in A5. Identify odd permutations in S3 with permutations in A5 with the same cycles as in S3 plus the cycle (4 5), e.g., (1 2) in S3 ↔ (1 2)(4 5) in A5. I think, it is obvious how to generalize it for any n, right?

Show that An for n≥3 is generated by 3-cycles, i.e., any element can be written as a product of 3-cycles. My solution is quite simple, but I wonder if I've missed something: Any element of an alternating group can be written as a product of even number of 2-cycles. Let's consider pairs of 2-cycles in such expression. They can be of two forms: (a,b)(b,c) and (a,b)(c,d). The first is immediately a 3-cycle: (a,b)(b,c)=(a,b,c). The second can be made into 3-cycles like this: (a,b)(c,d)=(a,b)(b,c)(b,c)(c,d)=(a,b,c)(b,c,d). So, each pair of 2-cycles can be converted to one to two 3-cycles.

a. What is the leaving group when 2-(N,N-dimethylamino)ethanol reacts with S-adenosylmethionine? b. What would the leaving group have to be if methionine itself were to react with 2-(N,N-dimethylamino)ethanol? c. Of what special significance is this difference?

So I'm taking a beginners course in Computer Science in Khan Academy because I'm basically computer illiterate - one of those iPad kids that never leaves their browser or understands how computers work in general. I'm understanding most of my lesson, but can't grok this specific bit saying that "if there is space to represent thousands of y-values, then we can use a very small quantization interval. If there is limited space, we can use a large interval." Are they saying that using a smaller quantization interval would increase the number of y values that the computer would need to store? I don't see how that would work; in the example they showed, there's 12 y-value…

In a field K the equality a4=a is satisfied for all a. Find the characteristic of the field K. My calculations: 2a = (2a)4 = 16a4 = 16a 14a=0 This allows for the characteristic to be 2 or 7. But, e.g., 34 = 81 = 4 (mod 7) rather than 3. So, the only answer is 2. 1. Is this derivation correct? 2. The hint in the textbook says to show that 2a=0. How to do that?

Since I have no relatives or friends near me, I thought it will be cool if i can get 10 people on here to answer quiz that I have created for my astronomy class. I would need from the 10 people that answer to answer at their best knowledge and include where you learned the topic, if you were able to answer the questions.