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Post a New Question | Current Questions | Live Experts
Homework Help: Science: Chemistry
- Introduction to Chemistry
- Atoms
- Chemical Change
- Molecules & Compounds
Recent Homework Questions About Chemistry
Post a New Question | Current Questions
| Chemistry |
| Hello! I have a question that leaving me stumped. So E means opposite and Z means together. In order to do this alternate cis/trans arrangement you have to order molecules a priority either 1 and 2. You have to go along either side of double bond and determine priority. I'm so... |
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| chemistry |
| I have this long online lab that I am working on and I am stuck on converting Molarity then ultimately finding the % of phosphoric acid in the cola? There is all of different steps I went through with information but I am going to try to give only the info needed to help me ou... |
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| Chemistry |
| Hi!! Okay So I have this question here and you have to pick the false statement. Now I believe its a or e. But I really can't decide which it is. I might be totally wrong about this which is why I need some help... please! These are the options: a. the bond length is the the i... |
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| CHEMISTRY |
| Which statement about structure and bonding is INCORRECT? a. ) The bond length is the internuclear distance. b. ) The covalent bond is a region of high electron charge density between two atoms. c. ) Hybrid orbitals are combination of atomic orbitals. d. ) There are the same n... |
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| chemistry |
| whats the correct formula for 1. rubidium selenide 2. potassium phosphate |
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| Chemistry |
| Hi! I have a question about Pi-Bonds: a. ) are the only kind of bonds present in double bonds b. ) have very little electron density along the internuclear axis c. ) are formed by endwise overlap of p-orbits d. ) are formed from hybrid orbitals e. ) are formed from s-orbitals ... |
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| Chemistry |
| Liquid methanol (CH3OH) is combusted in oxygen gas to yield carbon dioxide gas and liquid water Okay I keep getting this: CH3OH(l) + 1.5 O2(g) > CO2(g) + 2 H2O(l) the website tells me I'm wrong, but I dont know how to go about with out using fractions. Please help. Thanks |
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| Chemistry |
| Select the correct name for the following compound. Image: img39.imageshack.us/img39/2299/44906767.jpg a. 2,5-dimethyl-3-octyne-7-cyclobutane b. 4-cyclobutyl-1-isopropyl-3-methyl-1-hexyne c. 3-cyclobutyl-4,7-dimethyl-5-octyne d. 6-cyclobutyl-2,5-dimethyl-3-octyne e. 3-cyclobut... |
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| Chemistry |
| Which carbon atoms are all in the same plane (co-planar) in this molecule? Image: img12.imageshack.us/img12/6861/94274481.jpg a. ) 1, 2, 3, 4 b. ) 1, 3, 4, 5 c. ) 2, 3, 5, 6 d. ) 2, 3, 4, 6 e. ) 3, 4, 5, 6 I strongly think it's (c) by looking at the picture. But I'm not sure h... |
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| Chemistry |
| Some (or all) of the structures below are representations are of the same molecule. How many unique structures are shown (i.e., how many structures with different molecular formulae)? Image: img6(dot)imageshack(dot)us/content.php?page=done&l=img6/5716/80685628.jpg&via=mupload ... |
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| chemistry |
| what is the chemical formula for cadmium phosphate? |
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| chemistry |
| Online chemistry lab preparing standards help? I was told to prepare some standard for a chemistry lab and here where the instructions: Obtain a solution of known phosphate concentration. In this lab we will use (1.e-002M) potassium dihydrogen phosphate, KH2PO4. Note the conce... |
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| chemistry |
| Balance the equation: Note: If a chemical species coefficient is "1" then "1" needs to be entered in the field before that species. MnO4– + H+ + Fe2+ Mn2+ + H2O + Fe3+ |
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| chemistry |
| I had to do this online lab and have a total of 8 questions at the end and I am stuck half way through. Can someone please walk me through the last few question? Here is the Lab and my homework: In this experiment, we will determine the heat of reaction for a neutralization re... |
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| chemistry |
| The first step of the synthesis is described by the reaction below. When 1.000 g of Fe(NH4)2(SO4)2 6H2O is mixed with 13 mL of 1.0 M H2C2O4, the theoretical yield of FeC2O42H2O is grams. Fe(NH4)2(SO4)26H2O(s) + H2C2O4(aq) FeC2O42H2O(s) + (NH4)2SO4(aq) + H2SO4(aq) + 4 H2O(l) |
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| Bio-Chemistry |
| The process of breaking a complex substance down into smaller components is called what? |
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| chemistry |
| one mole of a gas occupies 27.0 liters, and its density is 1.41g/l at a particular temperature and pressure. what is its molecular weight? What is the density at STP? |
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| Dr.Bob - Question |
| I'm know I'm interested in the chemistry field. The problem is that I have to further narrow down my field of interest. I was curious to know what type of chemistry did you specialize in in the past. -christina |
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| chemistry |
| hi, Im not sure how to explain this well but here goes. Im doing a oxidization/reduction reaction to determine the charge of an element. charge is n formula n=a/b Problem: 0.6215 g sample of nickle metal was dissovled in 100.0ml of fe 3+ Note for the formulas: I put all the ch... |
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| chemistry |
| how many molecules of Xef6 are formed from 12.9L at 298K and 2.6atm according to the following reaction. assume excess is Xe |
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| chemistry |
| 6.70 A sample of benzene, C6H6, weighing 3.51g was burned in an excess of oxygen in bomb calorimeter. The temperature of the calorimeter rose from 25.00C to 37.18C. If the heat capacity of the calorimeter and contents was 12.05kJ/C, what is the value of q for burning 1.25 mol ... |
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| Chemistry |
| How do you identify the most stable carbocation? Is it the one with more bulky substituents? |
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| chemistry |
| When ice at 0C melts to liquid water at 0C, it absorbs 0.334 kj of heat per gram. Suppose the heat needed to melt 31.5 g of ice is absorbed from the water contained in a glass. If this water has a mass of .210 kg and a temperature of 21.0C, what is the final temperature of the... |
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| Chemistry |
| What are vinyllic organohalides? How would you be able to identify them? Thanks |
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| chemistry |
| Here is the question: A sample of ethanol, C2H5OH, weighing 2.84g was burned in an excess of oxygen in a bomb calorimeter. THe temperature of the calorimeter rose from 24C to 33.73C. If the heat capacity of the calorimeter and contents was 9.63 kj/C. What is the calue of q for... |
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| Chemistry |
| What effect do each of these have on the freezing point of the solvent? a. a nonvolatile solute that dissociates in the solvent b. a volatile solute that does not dissociate c. two solutes that react according to the equation: A+B---> C Please explain why. |
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| Chemistry |
| I am very confused on this problem. Any help would be great: 50 g of silver nitrate is mixed with 50 g of hydrochloric acid in a water-based solution. A white precipitate forms (silver chloride.) The solution is filtered and the white precipitate collected and dried. The dried... |
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| Chemistry |
| How do you determine the percent composition by mass of a 100 g K2SO4 solution containing a 20-g solute. What is the mole percent composition of the solute, assuming that the solution consists of 100 g water and 20 g of K2S04? For percent composition of K2S04, I got 44.9 % K, ... |
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| chemistry |
| The heat capacity of object B is twice that of object A. Initially A is at 300 K and B is at 450 K. They are placed in thermal contact and the combination is isolated. The final temperature of both objects is: |
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| chemistry |
| How do I prepare 10% w/v HCl from 37%(w/w) HCl (density 1.19g/ml)? Thanks. |
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| chemistry |
| what are some source errors in my experiment? determine absolute zero. We attached a capillary to a ruler with a thermometer. placed it in water and heated. I recorded and my partner did the readings. source errors: -partner didn't stir the water before he took the readings. F... |
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| chemistry |
| ok heres my question, nitrogylcerin decomposes: 4c3h4(no5)3 --->12co2(g) +10h20(g)+6n2(g)+02(g) whats is the max pressure that a 10.0L container will be able to withstand if 5.00 Nitroglycerin decomposes at temp of 1250c mm of nitroglycerin =227 g/m i got 2.00atm b) what ar... |
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| chemistry |
| Long but quick chemistry lab that I need confirmation on answers? OK so I have this lab that went pretty quick and smooth and I have an online assessment that I needed to put all my figures in. I am all complete but am still having trouble with 1 problems that the assessment i... |
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| Chemistry |
| If you place an aqueous solutions of CuBr2 (which is then Cu(H2O)4 2+) with solid KBr added to it in a hot water bath what do you observe and why? |
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| Organic chemistry |
| compound with a molecular formula C8H16O has the following H-nmr spectrum: 3H triplet at 0.90, 1.0 to 1.6 8H multiplet, 2.05 3H singlet, 2.25 2H triplet. What is the structure of this compound? I think it is 2-octanone but not sure |
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| chemistry |
| Long but quick chemistry lab that I need confirmation on answers if possible? OK so I have this lab that went pretty quick and smooth and I have an online assessment that I needed to put all my figures in. I am all complete but am having trouble with 3 problems that the assess... |
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| chemistry |
| what exactly would you observe and see at the end of the reaction of zinc and lead nitrate? include in formation about colour changes and bubbles. you can use the following equation to help; zinc+lead nitrate(arrow) zinc nitrate+lead |
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| Chemistry |
| If you add Na2CO3 and AgNO3 together in a test tube what exactly would you observe and what would be the equation for the equilibrium system? If you then add HNO3 to the solution what exactly would you observe and what would be the equation for that reaction? |
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| chemistry |
| does this sound right for what happens with the zinc and lead nitrate reaction? could i add anything else? The zinc displaces the lead. You can observe the lead preipitating on the zinc surface. The zinc changes to black crystals which dissolve in the water and there are lead ... |
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| chemistry |
| why does zinc and lead nitrate react? |
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| chemistry |
| what do you observe in the displacement reaction of zinc and lead nitrate? also, what is the symbol equation for this reaction? |
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| chemistry |
| A mixture of hydrogen peroxide, H2O2, and hydrazine, N2H4, can be used as a rocket propellant. The reaction is: 7 H2O2(g) + N2H4(l) ® 2 HNO3(aq) + 8 H2O(l) a) How many moles of H2O2 react with 0.477 mol N2H4? [1] ___________ b) How many grams of HNO3 can be produced in a react... |
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| chemistry |
| A 10.0 mL sample of 3.00 M KOH(aq) is transferred to a 250.0 ml volumetric flask and diluted to the mark. It was found that 38.5 ml of this diluted solution was needed to react the stoichimetric point in a titration of 10.0 mL of a phosphoric acid, H3PO4, solution. The reactio... |
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| chemistry |
| Gas A has a density that is 1.20 times that of gas B. If gas A effuses through an orifice at a rate of 3.41g/L, at what rate will gas B effuse? Hint: Ratio the molecular masses to the densities. Use this information with Graham's law of diffusion. Note that 3.41g/L is a rate. ... |
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