Homework Help

Help please. Which compounds would be formed in the reaction of ethene with aqueous bromine in the presence of sodium chloride? 1 CH2ClCH2Cl 2 CH2BrCH2Cl 3 CH2BrCH2Br I know that electrophilic addition occurs when ethene reacts with bromine. But what happens with NaCl? What kind of reaction is it? Can it be free radical substitution? Is Cl from NaCl a free radical? Because it's not Cl2 where UV light is required to break the bonds to create free radicals.

I need some help with converting from roman numerals to ASCII code. I would just like a better understanding of how to do it My teacher gave us the following table and we have to get the rest of the code ( 0-6, 10-12) and i honestly have no clue where to go when it comes to the ASCII code I cant really find any good resources online to figure it out.

Hi everyone I have a genetics problem that I'm struggling with, Here is the problem: Can you devise a simple formula for the calculation of the number of progeny genotypes in dihybrid, trihybrid, and so forth crosses? Repeat for phenotypes. I'm struggling to understand this problem. If somebody can give me a little "push" and help get me started, I would greatly appreciate that. Thanks.

Hello, Just started my metabolism course and it's been about a year since my last biochemistry course so I've got to refresh myself on some of the basics. In a section of my textbook that was talking about the regulation of metabolic pathways, it said: "The first committed step [of a metabolic pathway], being irreversible, functions too slowly to permit its substrates and products to equilibrate. (if the reaction were at equilibrium, it would not be irreversible)" I'm a little confused, wouldn't an irreversible reaction be faster than a reversible one since the product is not continually being converted back to the initial substrate? Irreversible reactions are h…

Question: How many grams of sodium oxide are produced when 73.2g of sodium react completely with oxygen gas? Just want to confirm if my procedure/answer is correct. 4 Na + O2 ---> 2 Na2O ----- Balanced Equation So I would assume all I have to do is 1) get the moles of Na 2) divide my 2 to get the moles of Na2O 3) multiply by the molar mass of Na2O to get the grams of Na2O. Solution: 73g ÷ 23g/mol (molar mass Na) = 3.2 moles 3.2 moles ÷ 2 = 1.6 moles of Na2O 1.6 moles × 62 g/mol (molar mass of Na2O) = 98.7 Did I do my computations correctly?

What is the volume of 10kg of a liquid which has a relative density of 10.2? What is the volume of a gas which has a mass of 24lb and a relative density of 0.86? Remember first one is in metric And can you please show your work! Thanks

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I am not 100% of the answers to the following questions: Q1. This photograph is characteristic of which major biome? Arctictundra Coniferous forest Temperate forest Desert Q2. Which biome has a plant community dominated by grasses and a climate characterized by an intermediate amount of rainfall, warm summers and cold winters? Arctic tundra Temperate grassland Tropical savanna grassland Desert For (1) I think the answer is temperate forest (not a dessert or tundra obviously, and doesn't contain coniferous) and for (2) which is the one I'm having trouble with, I think the answer is temperate grassland (desserts don't have grass, the arctic tundra woul…

Indicate the tool and a proper metric unit you would use to measure the following items. No sentences needed. I just needed help with it because obviously you wouldn't measure the mass of the Earth in grams. Thanks! a) mass of a nailb) volume of a cup of water c) distance from here to california d) mass of a piece of dirt e) density of a pebble f) mass of the earth

Hi everyone, I'm a beginner of topology and I'm doing a proof with the following details: Let T be the finite-closed topology on a set X. If T is also the discrete topology, prove that the set X is finite. I write my proof as follows: --------------------------------- Proof: Since T is the discrete topology, all singleton set {x} are in T. Hence, every subset of X is in T. Since T is finite-closed, every sets in T must have finite complement with respect to X. But since every subset of X is in T, every subsets of X must have finite complement w.r.t. X. Hence, X is finite. ---------------------------------- May anyone commment on if my proo…

I have 2 bacterial samples which I have to identify for a Microbiology project. FAECAL SAMPLE: Gram - Bacilli Non haemolytic (Horse Blood Agar) Non Lactose Fermenting (MacConkey Agar) No Growth (Mannitol Salt Agar) Catalase + Oxidase - Also these biochemical analysis results came from my Microbact strip 12E & 12A Lysine + Ornithine + H2S + Glucose + Mannitol - Xylose + ONPG - Indole - Urease - VP + Citrate + TDA + VAGINAL SAMPLE: Gram - Bacilli Non haemolytic (Horse Blood Agar) - may have recorded this wrong, could have possibly been b-haemolytic? Lactose fermenting (MacConkey Agar) No Growth (Mannitol Salt Agar) Catalase + Oxidase: when we did the test, tw…

And how can I calculate the pH of this solution? Thanks

Hi there, Can somebody explain me the main function in Interrupt in the operating System?

C16H12O6 (or glucose) contains 2.03*10^21: -HOw do I find # of Hydrogen only? -How do I find molecules of glucose?

I've doped 10%mole of 6.16M FeCl3 into titanium isopropoxide I have prepared 6.16M of Fecl3 by dissolving 5g of iron iii chloride tetra hydrate powder into 5ml of water so how to calculate the morality of this solution?? Thanks

Hi all, This is my first post & I hope I've put it in the right place. I'm a mature student retaking secondary school Maths by distance learning. I'm currently on Quadratic Equations and I've got myself in a right pickle! I'm ok with the theory but when it comes to applying it to word problems I'm struggling. Specifically the following problem which I've been banging my head against a wall to solve but just can't get: "3 consecutive numbers are written as x, x+1, x+2. The square of the largest number is 45 less than the sum of the squares of the other numbers. Find the 3 numbers?" I know the answer is 8, 9, 10 but I can't see how the solution is re…

speculate what would might happen to prokaryotes and eukaryotes if photosynthesis never evolved what does it mean by "photosynthesis evolve"? thank you!

A couple of friends and I are building an electrical miniature cable car, kind of like the one in the picture. We're mechanical engineering majors and love this kind of things but we just started out and don't really know much yet, so we're just looking for new ideas as to how to go about doing this. So how would you do it? Motor Specs: Looks something like on the picture. 9volt battery powered. The only rule is to work this exact motor. We are thinking of using gears but we're not sure how many, etc. So we would love to get your opinion! Thanks in advance! It will be finished in about a week so we'll be posting pictures here when we're done!

Hi I'm a Bsc Microbiology student and I have to do graph with the % survival vs time. But I don't know how can I do this. I have counts for three replicas at different times. How can I accomplish this? How can I calculate the % survival? Thank you in advance.

I was going to see if someone could check my work to see if I went about solving this problem correctly? Calculate the weight of HEPES you would use to make 100 mL of a 0.1 M buffer. HEPES has a molecular weight of 238.3. So starting with 100 mL, I did the following: 100 mL X (1 L/1000 mL) x (0.1 moles/1 L) x (238.3 g/1 mole) = 2.38 g of HEPES. Is this correct? Thanks for looking at this.

I am trying to figure out how you would select a good buffer to use to reach a pH of 8 and it will need to be a 0.1 M solution for a lab experiment I'll doing for class this week. I've been given a list of possible buffer salts to select and then will need to add either HCl or NaOH to get to my pH. The question I have, how do you best tell? For example, for one choice, I need to choose between Citrate or Phosphate. I know both are polyprotic (each have 3 pKas). Would using the Hendersen-Hasselbalch equation come in handy for this? I've read that a good buffer will be within one value of your desired pH but wanted confirmation on this. So if I were to take Citrate and …

a solution of sodium chloride and lead nitrate is given....you need to seperate the sodium chloride. lead nitrate and sodium chloride would result in lead chloride, this can can be optained by filtration but its sodium chloride you need.... P.s sorry about any wrong spelling and grammer

To begin with, I'm in my first real mathematics course this semester. Most of my work has been concentrated in physics and I have no background in analysis and only some basic set theory. The question is: Let [latex] R^\infty[/latex] be the set of all infinite-tuples [latex](x_1, x_2,...)[/latex] of all real numbers that end in an infinite string of 0's. Define an inner product via [latex] \left\langle x,y \right\rangle = \sum_{i=1}{^\infty } x_i y_i[/latex] Let ||x-y|| be the induced metric on [latex] R^\infty[/latex]. Let [latex] e_i[/latex] be the vector with a 1 in the ith entry and a 0 in the other entries. These form a basis for [latex] R^\infty[/…

I'm taking an internal combustion class this semester and the professor asked the class why the thermal efficiency increases when you increase the heat capacity ratio even though the area on the P-V diagram for an Otto cycle, and thus the work created by the process, decreases. It's obvious from the thermal efficiency equation that this is true but i'm not exactly sure what my professor is trying to get at. Since the work, which is the output, decreased according the P-V diagram, while the thermal efficiency increased, I must assume that the input decreased even more rapidly. I'm not sure how these all tie together. Any help would be much appreciated. cheers, Laur…

What is the best way to verify Identiteis