Homework Help

I'm gonna ask a stupid question, fluorine lacks one valence electron hydrogen lacks one electron yet hydrogen is not considered a halogen... yet helium has two electrons in it's outer shell and is a Nobel gas...why?

Hello, I am in high school and I am writing an essay for a competition about microbes inside humans. However, I am very confused about several topics that I have read about, so I would greatly appreciate it if you could answer the following questions! - What's the difference between glycans and carbohydrates? Do they get digested in the same way in the large intestine? - many sites state that the methanogens in the gut are anaerobic, so is there no oxygen in the gut? - is the bacteria B infantis a fermentative bacteria? - How do fermentative bacteria release hydrogen during fermentation? Why do they produce hydrogen (what benefit)? - Why do m…

how to do question 28-30

Could someone explain the ans in b（i)

If we have a vector that we want to define using a pair of base vectors that do not meet at a 90 degree angle I understand that one way is to combine these basis vectors and, adding a coefficient to each form a parallelogram which has the vector as a "destination". They are contravariant vectors. When it comes to the covariant vectors it seems that we have to follow these contravariant vectors until a perpendicular from them would ,if drawn go through the vector we are trying to describe. The question I want to ask is whether these covariant vectors add in the same way as the contravariant ones. Is is possible to "follow"…

I have chosen to do an experiment on glucose concentration in fruit juices if i use benidicts solution would i be successful? I need to compare the concentration of glucose in different fruit juices how will that be done? I was thinking that a colouromiter would help any advice/tips much appreciated Hamza

Hi, I'm in 12th grade and for my senior project I wanted to do an experiment on the effects that copper and zinc have on mung beans. I have copper sulfate pentahyde and zinc sulfate monohydrate, which I had purchased because I have seen information on other similar experiments where these were used to test the effects of copper and zinc on plants. I was wondering whether I should instead use copper powder and zinc powder instead as these, I think, would make for better variables because they are purer forms of metal. Aside from this, I have had trouble deciding what amounts to use on the plants and whether I should add the amounts to the soil directly before pla…

Biomedical science student currently studying a microbiology module. I have a question asking me for an explanation as to why there is a need to dilute for the faecal coliform count but not for the count of enterococci? Any help is appreciated. Thank you.

Predict the 31P{1H} NMR spectra. Unable to find the equations to calculate shifts. There are many equations in my note however they are all over the place and cannot make sense of them.

Hello, I'm a bit frustrated by one section of my microbiology reading for this week. I just can't wrap my head around the variables in the equation for cell population count and prediction of cell numbers in x amount of time. I'm reading https://courses.lumenlearning.com/microbiology/chapter/how-microbes-grow/ . One of the sample questions asks, "With a doubling time of 30 minutes and a starting population size of 1 × 105 cells, how many cells will be present after 2 hours, assuming no cell death?" The formula is Nn=N02n Nn is the number of cells at any generation n, N0 is the initial number of cells, and n is the number of generations. …

I have been assembling 70/30 Potassium perchlorate and AL in cardboard tubes with glued ends. Each component is added individually and not mixed until ready to light the fire cracker. Should I have any concern when shaking the mixture to combine before lighting? I've shaken many of these vigorously to combine the two materials. My question is should I have any concern shaking within the closed system to combine. No problems so far. My research indicates that this binary mixing is the safest method since the mixture only becomes active within the closed container. Will the mixture ever spontaneously ignite when shaking without the spark of the fuse…

Hi, My question is a simple one with a possibly very complex answer. I have three DNA samples (A,B and C) Sample A(female) and B(male) has the same father, but not mother. Sample B(male) and C(male) has the same mother, but not father. The Sample for the father of A and B is available, but not the sample of the mother of B and C. My questions are; 1. Can the paternal lineage between A and B be proven. 2. Can the maternal lineage between B and C be proven. Thanks in advance,

How to measure/calculate/proof the difussion when you drop ca2+ into sodium alginate......that is all the information my daughter was given for a class experiment. Any ideas??

Hello guys, I need idea for high school science project. The project should not require expensive equipment or rare materials. Project should solve humanity problem or be related with humanity. I have one idea, but my idea is not complete. My idea was take bacteria’s examples from school desk, then grow bacteria’s in petri dishes and identify (Gram positive or Gram negative), but I can’t relate it with human health or similar thing. I would be grateful if you could complete my idea. It would be good if you send some links. Thanks for any help. :)

So for my 8th-grade class, I have to write a paper on wave-particle duality and I am looking for some good material to improve it and my understanding. (now Physics aren't my fave but I am at a different place then the rest of my class on science(I prefer genetics tho) Sincerely, me

Spoiler Greetings all, dont want you to solve or do my homework, im just asking to help me get insight to what im supossed to do, my problem is that i never get any course in genetics before. My homework task is following, i you could point me in right direction or simplify this for me i would be gratefull, im having course on my uni, but i understand only a bit of everything. Describing the genetic trait or the syndrome that we monitor does not have to be a disease, it is important to be able to follow it. List the literature and go through these works briefly. The point is to point out which gene / genes influence what we are mon…

I'm attempting to solve an electrical engineering problem. The question was to find the values of xd, xa, rs and gd in a p-n junction, as such I have completed the first three parts and am now struggling to find the value of the the last part due to my calculator stating a math error when imputing the values into the equation i'm using. The value of gd is found using the equation gd = I/ nkT and the only value i'm missing is the value for I which when I input i receive my error. With all the correct values inserted, i have put this equation into my calculator. I = 10-8 * ( e(0.5/1.4*1.38x10^-23*300 -1). Any help would be greatly appreciated, thank you.

Do u have any idea about some of this stuff written in the file? Especially about this biological proccess we have to solve using differents sound with Do. What we need to do is to imagine sth, which may not be real but its hard to find out any ideas Link removed

Where do you begin to draw a Bohr model for hydrogen sulphite? How? What is it supposed to look like? Could someone give me an example of another ion too? I would really appreciate it. Thank you so much!

I am an MA student at City Uni in London UK. I am writing a novel on the Creative Writing course there, and I have a character of a chemist creating novel compounds that he is ingesting to find God. It is crucial that my *fake* molecules at least add up in terms of how they would join together etc. and react together. I am looking for someone with creative chemistry skills willing to exchange a few emails with me on these fantasy compounds and help me draw realistic molecule diagrams. I think I need to make about four of them. I am NOT interested in these being viable, but we would have to use some real building blocks in the process. You can check with my programme head …

Hi. I'm doing a chemistry assignment in which I'm having difficulties. I am on a open university course (Environmental Sciences, first year) and never had chemistry in high-school (coming from the services area), therefore I need some assistance. Whatever help i get is welcomed. This is it: A solution of 100 cm3 of acetic acid (CH3COOH) with a concentration of 0.2 mol / L was titrated with aqueous sodium hydroxide solution (NaOH) at a concentration of 0.1 mol / L. a) Write the chemical reaction that translates the titration. b) What is the pH of the solution after adding 30mL of NaOH c) In a titration what is the meaning of the expression "point of equivalence"?…

I just don't understand this. What's the process to get these answers? I tried the same process as with closed interval but I was wrong. Why none, none, none, none? I'm stuck. Show me how you would do it, or any other example you put to help me understand. Any help is welcome, thank you for your answers. (EXAMPLE 2, (b)).

Hi, im a student, and i need to conduct a research on anything chemistry related. i am interested in electrochemistry, so i thought of doing the affects of different currents to the electrolysis of copper sulphate solution. however, my teacher thought that it was too simple and i should find maybe something that i can extract copper sulphate from to get marks on the personal engagement part. do anyone have any ideas on how i can make this experiment 'a lil bit complex'? or do you have any ideas for my chemistry research relating to chemistry? thank you so much

As a student of psychology, why we study sociology? I recently started my university life and my major is psychology..so it would be better if someone could elaborate it..