CHEMISTRY (WEBWORK)

1,475 results, page 15
  1. chemistry

    Write the compound formulas for each of the following pairs and the name of the compound formed when the elements or radicals combine. Mg+2 + OH-1 K+1 + PO4-3 Cu+2 + S-2 N+5 + O-2 Compounds have zero charge. Therefore, for magnesium hydroxide, the first
  2. chemistry

    Ok so im just totally confused because i don't technically have chemistry teacher (i have cancer so i cant go to school so while i have a teacher i can email questions to, he doesnt really help so im stuck teaching myself) & i didn't get any reference to
  3. chemistry

    Dr bob, Thanks, i understand that, at last! But wot if im asked to calculate when it is given as words? would it still be the same? Ie. instead of Al2O3, im giving it in words ie aliminium oxide. Basically im asked to calculate the mass of oxygen and the
  4. Chemistry------DrBobb..

    Lead metal is added to 0.140 Cr^3+(aq). Pb(s)+ 2Cr^3(aq) Pb^2+(aq)+2Cr^2+(aq) KC=3.2*10^{-10} A. What is Pb^2+ when equilibrium is established in the reaction? B. What is Cr^2+ when equilibrium is established in the reaction? C. What is Cr^3+ when
  5. chemistry Dr BOB

    In many residential water systems, the aqueous Fe3+ concentration is high enough to stain sinks and turn drinking water light brown. The iron content is analyzed by first reducing the Fe3+ to Fe2+ and then titrating with MnO4- in acidic solution. Fe2+(aq)
  6. english

    Please give feedback, im sorry this is so so long! Many parents struggle to decide on whether they should send their child to a brick and mortar school or online school. For high school students, brick and mortar school is a better option than online
  7. Chem--- last lab question!!

    My lab partner performed one section of a lab on her own while I worked on something else. This section involved first adding a drop of 6 M NaOH to Zn(NO3)2. A precipitate forms. This is repeated in three separate test tubes. In each test tube, a different
  8. Stoichiometry problem

    I'm stuck and am hoping you can help. Here is the problem: You react 7.92 grams of silver nitrate, AgNO3(aq), with an excess of sodium chloride, NaCl(aq). How many grams of silver chloride, AgCl(s), will precipitate from the solution? Any help would be
  9. TLC error correction

    Question: Consider the following errors that could be made when running TLC. Indicate what should be done to correct the error. A. A two-component mixture containing 1-octene and 1,4-dimethylbenzene gave only one spot with an Rf value of 0.95. The solvent
  10. abit of everythingURGENTDUETOMORROW

    malevolent is to kind as miserly is to infant is to child as teenager is to flower is to biology as acid is to delineate is to outline as evaluate is to mildew is to plant as dugong is to ostler is to horse as______is to ____ sheep____ first public
  11. CHemistry Please Help. DR. BOBB

    Standardization of the Sodium Thiosulfate Solution Make up a standard solution of potassium iodate by accurately “weighing by difference” about 0.1 g of KIO3 and placing it in your 100 mL volumetric flask. Fill the flask to mark with distilled water.
  12. Chemistry Dr. Bob222

    Ok, For Cup C Mass of cup,water,stirrer: 55.15 Mass of sodium bicarbonate: 2.02g mass of citric acid: 0.77g total mass: 57.94g mass of cup,solution, stirrer after reaction: 57.64 difference (CO2): 0.30g Part B: Limiting Reactants Plastic Cup C 7. Determine
  13. chemistry

    If a chemistry student collected 825 mL of gas at 25 degrees C and 7.90*10^2torr, how many moles did she collect? PV=nRT Put P in atmospheres. torr/760 = atm. V is volume (in LITERS.) solve for n, the number of mols. R is a constant of 0.08206 L*atm/mol*K
  14. Chemistry

    Complete the following table for aqueous solutions of caffeine, C8H10O2N4. a) molality b) mass percent solvent c) Ppm solute All we're given is Mole fraction solvent= .900. How do I solve for the other parts with only this?? It XH2O = 0.9, then
  15. earth science

    How would you set up a simple experiment to test whether salt crystal growth is affected by temperature It might help if you were clear on how an experiment is set up. An independent variable is the potential stimulus or cause, usually directly manipulated
  16. English

    Writeacher, thank you very much! Here are some sentences I varied and I urgently need you to check. I need to clarify those things. Could you please help me express sentence 1? We need to impress the EU to support the project!!! Rationale 1)The preparatory
  17. CHEMISTRY

    I'm showing the procedure of the lab and what was asked. What I have question on is towards the end. Much help would be appreciated a lot!! First I had to balance the equation given to me: 2 Na HCO3 (s) Δ over arrow (produces) Na2 CO3 (s) + CO2 (g) + H2O
  18. from pg 2...Dr.Bob.

    Sorry but I have just a few more Q'sfrom what you said And something that I saw today. Actually I was talking about specific course exams. I've been out of touch for awhile so I don't know all the rules about GRE, SAT, GMAT, etc. Do you mean that I ask
  19. 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
  20. 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
  21. social studies

    can you see if i have good grammar,usage, mechanics and spelling Job description: use various types of equipment, develop, secure, and packages. Physical evidence for scientific evaluation and comparison, prepares detailed reports on the observation and
  22. Chem teacherf

    My teacher last year in General Chemistry was really great. She was highly organized, always prepared for class, approachable and fair. Chemistry is such a hard class that she really helped me get through it. My Organic teacher is another story. She is a
  23. chemistry - DrBob?

    Hi! Can you tell me if I chose the right options for my chemistry homework? My answers are at the bottom. 1. Electrostatic interaction is important for which type of bond? A. ionic bond B. triple covalent bond C. single covalent bond D. double covalent
  24. Chemistry

    Hi! Can you tell me if I chose the right options for my chemistry homework? My answers are at the bottom. 1. Electrostatic interaction is important for which type of bond? A. ionic bond B. triple covalent bond C. single covalent bond D. double covalent
  25. Chemistry

    I am having trouble understanding dipole moments. I can't figure out why that a tetrahedral CF4 molecule, trigonal planar SO3 molecule and a octahedral H2SF4 molecule are non-polar while a H2CF2 is polar? I hope I explained that well and thanks! For CF4,
  26. World History

    1. The purpose of American and European imperialism in the Pacific was mainly to gain. A. markets fro manufactured products B. coaling stations and naval bases C. sources of raw materials D. places for surplus population I said C. 2. The development of
  27. History Essay

    Hiya, I had to write an essay about the most important event in the 60s. Here is my essay: The Space Race On the 20th July 1969, the human race accomplished its single greatest achievement of all time: when a human first set foot on another celestial body.
  28. english

    Read the following paragraphs carefully and compare them. Paragraph #1 Since every person has only one opportunity to live each hour of his life, the time must be spent wisely. He should spend it thoughtfully. He should care what he does with his time. He
  29. Writing

    Please give me a score of 1-6 (one being poor and six being excellent). Also, please give me some feedback! Thank you in advance! Essay prompt: What motivates people to change? Essay: Many people know that eating junk food is unhealthy. Yet, they keep
  30. SAT WRITING

    Please give me a score of 1-6 (one being poor and six being excellent). Also, please give me some feedback! Thank you in advance! Essay prompt: What motivates people to change? Essay: Many people know that eating junk food is unhealthy. Yet, they keep
  31. SAT Writing

    Please give me a score of 1-6 (one being poor and six being excellent). Also, please give me some feedback! Thank you in advance! Essay prompt: What motivates people to change? Essay: Many people know that eating junk food is unhealthy. Yet, they keep
  32. Writing

    Please give me a score of 1-6 (one being poor and six being excellent). Also, please give me some feedback! Thank you in advance! Essay prompt: What motivates people to change? Essay: Many people know that eating junk food is unhealthy. Yet, they keep
  33. Chemistry

    Objectives To determine the molecular weight of a volatile liquid. Discussion [This laboratory exercise was adapted from one in Beran and Brady's Laboratory Manual for General Chemistry , John Wiley & Sons, 1982] The Dumas Method for determining the
  34. Chem hw!

    1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas
  35. Chem hw!

    1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas
  36. English

    I have completed this test and I missed 4 questions. My answers are submitted in blue, can you tell me which questions are wrong. 1.Having studied small engine repair in night school, fixing the lawn mower was easy. dangling modifier 2. When I asked for a
  37. sciencee

    1. What pressure would be needed to compress 25.1 mL of hydrogen at 1.01 atm to 25% of its original volume? 2. If the pressure on a 1.04-L sample of gas is doubled at constant temperature, what will be the new volume of the gas? 3. A 1.04-L sample of gas
  38. chemistry...DRBobb i have a questionnnn

    We actually talked about this before just to remind you im posting the previous post below: ______________________________________________________ ____________________________________________________ And i have a different question regarding a post someone
  39. English

    Discuss the manner in which the theories expressed by John Winthrop are in some degree evident in American government and culture today. Can someone tell if my answer is right. In Prospero's America, Walter W. Woodward looks at the exchange of catalytic
  40. college English

    Discuss the manner in which the theories expressed by John Winthrop are in some degree evident in American government and culture today. Can someone tell if my answer is right. In Prospero's America, Walter W. Woodward looks at the exchange of catalytic
  41. College English

    John Winthrop “A Model of Christian Charity" Discuss the manner in which the theories expressed by Winthrop are in some degree evident in American government and culture today. CAN SOMEONE TELL ME IF I ANSWER IT RIGHT? In Prospero's America, Walter W.
  42. how can we improve jiskha.com?

    How can we improve jiskha.com? Any ideas for improvement are welcome. Thanks! Perhaps separating the subject areas. The subject area categories could be fairly general: English, including how to research Mathematics/economics Sciences Social
  43. Grammatical Corrections in my Essay...?

    Here's my essay, about the most important event in the 60s. It's for history. Could you let me know if there's any gramatical mistakes, or make suggestions? Hiya, I had to write an essay about the most important event in the 60s. Here is my essay: The
  44. FRENCH

    Can someone PLEASE proofread this? It's due tomorrow... Après un certain temps, Bugs Bunny a surgi et il a dit « Quoi de neuf, docteur? » Lorsque Markey lui a rapporté qu'il recherche les trésors de la Montagne des Bonbons, le lapin débonnaire a
  45. science(chem&statistics)

    I have to write a abstract for my paper I was wondering if it was better to write it at the beginning or the end of the lab report. If I was to eliminate 1 value as an outlier would I go and include that in calculations of the RSD? I would assume not since
  46. College English

    I have been pouring over this all day and would appreciate if someone could look this over for me with some good news... am I getting it? Gracias! >> represents my chosen answer. 1. Having studied small engine repair in night school, fixing the lawn mower
  47. English Check

    Online Vs Traditional Dating Thesis : Technology has brought many innovations in human life and one of the greatest is online dating. However, just like Traditional dating, online involves a lot heartbreaks too and both are harmful if done recklessly. In
  48. English

    1.Having studied small engine repair in night school, fixing the lawn mower was easy. misplaced modifier dangling modifier faulty predication incomplete comparison Question 2 When I asked for a submarine, the convenience store clerk said he didn't have
  49. Chemistry Questions!!

    I was sick for 2 days, and that's really not good in any chemistry class, let alone mine, which is an advanced one. I don't know what I was thinking when I tried to be smart, but I really need help. It's pretty basic, I think, so anyone..? Also, I really
  50. English

    1.Having studied small engine repair in night school, fixing the lawn mower was easy. misplaced modifier dangling modifier faulty predication incomplete comparison Question 2 When I asked for a submarine, the convenience store clerk said he didn't have
  51. College English

    I submitted this yesterday and Ms. Sue thought I did well (except 7,11) but I still managed to get 4 wrong - and my mind is a mess trying to figure out where I went wrong! Please help - my mid is coming! >> represents my chosen answer. 1. Having studied
  52. chemistry

    Enthalpy and Entropy in Reactions and Solutions Introduction In the course of most physical processes and chemical reactions there is a change in energy. In chemistry what is normally measured is H (enthalpy change), the change in heat at constant pressure
  53. Volatility

    Question: A mixture of p-nitrophenol and o-nitrophenol can be separated by steam distillation. The o-nitrophenol is steam volatile, and the para iosmer is not volatile. Explain. Base your answer on the ability of the isomers to form hydrogen bonds
  54. to writ teacher

    Life after College Caitlin Petre is a graduate from Stanford University. She graduated with a 3.90 GPA with a Master’s degree in Philosophy. One day after graduation, Petre went for an interview for a job and she was asked to fill out a W-4 form. When
  55. english essay

    Life after College Caitlin Petre is a graduate from Stanford University. She graduated with a 3.90 GPA with a Master’s degree in Philosophy. One day after graduation, Petre went for an interview for a job and she was asked to fill out a W-4 form. When
  56. To Dr.Bob

    The problem you helped me with: A liter of a solution saturated at 25 deg C with calcium oxalate, CaC2O4 is evaporated to dryness, giving a .0061 gm residue of CaC2)4. Calculate the concentrations of the inons, and the molar solubility and the solubility
  57. English

    This is a chemistry lab report, but I was wondering if someone could edit the grammar and look at the sentence structure, etc. I know it's really long and boring, but even if you just look over a bit of it, I would really appreciate it. And I'm assuming
  58. EssayCHECK

    Online Vs Traditional Dating Innovations and technology has brought about many changes in day to day human life. More recently, and with the advent of the internet, communication amongst people from all over the world has drastically increased to levels
  59. English

    im an only child and parents are too busy to help so, i need to interview someone that went to school 20 years ago and i was wondering if anyone would like to help me. Theses are my 7 questions because i already have 3 answered: 1.How was school like back
  60. science?

    Why would a potato cook faster if you poke holes in it with a fork before microwaving it? ~My thinking is that it would increase the surface area..but this could be just partially why it cooks faster. Thank You =D I don't know in a microwave it cooks
  61. Chemistry

    Read earlier posts on this question and still find my self confused. The question being H2SO4(aq) -> 2H^+ (aq) + SO4^-2 (aq). A 21g sample of sulfric acid dissolved completely in sufficient water to make a 0.25 l of final solution. Calculate hydrogen ion
  62. science( chem)

    Basically what color is yellow when they say "Yellow"? The titrations I have done are light yellow when approaching the end point but whatever color you see is what you get, I suppose. So titrate to a very light color. Would the extra 5ml of starch
  63. Health

    1. A 15-year old female patient has experienced daily nausea for the past two months. The patient states that she feels like "I've eaten something that has upset my stomach.: She denies vomiting and weight loss. The patient has noticed a weight gain of 10
  64. English *Answers Check*

    What is acupuncture? 1 Acupuncture is one of the oldest, most commonly used medical procedures in the world. Originating in China more than 2,000 years ago, acupuncture began to become better known in the United States in 1971, when New York Times reporter
  65. Health

    1. A 15-year old female patient has experienced daily nausea for the past two months. The patient states that she feels like "I've eaten something that has upset my stomach.: She denies vomiting and weight loss. The patient has noticed a weight gain of 10
  66. Health

    1. A 15-year old female patient has experienced daily nausea for the past two months. The patient states that she feels like "I've eaten something that has upset my stomach.: She denies vomiting and weight loss. The patient has noticed a weight gain of 10
  67. Health

    Ok, here you go Ms. Sue. These are what I think the answers might be. Please correct me if they are not right. And thank you. 1. A 15-year old female patient has experienced daily nausea for the past two months. The patient states that she feels like "I've
  68. Health

    1. A 15-year old female patient has experienced daily nausea for the past two months. The patient states that she feels like "I've eaten something that has upset my stomach.: She denies vomiting and weight loss. The patient has noticed a weight gain of 10
  69. Survey for history..

    We have to do a presentation about the 60s and choose the most significant event. Our teacher said we may interview experts or people around the time to get more information, as this task is independant. Could as many people as possible please answer my
  70. science (chem)

    Does EDTA react with light? I forgot to cover a dilute bottle of EDTA (about 0.01M) and was wondering if that would have any affect on the solution I don't think so. I have used EDTA many times and never covered it or used a tinted container. okay =) i
  71. science (chem)

    For the preparation and standardization of NaOH with KHP im supposed to boil water for 1hr and 30 min to remove CO2....the problem is that if I don't boil it for that long and (30 min) b/c of not enough time but I put the water I boiled for 1/2 hr
  72. Chem

    I have a chemistry test that I need help with. My answers have stars by them Can someone please help me with the answers to this test??? Part 1 – Matter as Energy & Structure 1. When a pair of electrons is shared between two atoms, a covalent bond is
  73. Medical Terminology

    Hello. Please,if someone can help me answer all these questions. I have few answers and i would like to compare it to my own answers thanks. 1. Dr. Hannah places a stethoscope to a seven-year-old child’s chest. The lungs reveal basilar rales. Which
  74. medical terminology

    1. Dr. Hannah places a stethoscope to a seven-year-old child’s chest. The lungs reveal basilar rales. Which method is Dr. Hannah using to perform the physical examination? A. Auscultation C. Percussion B. Palpation D. Visualization 2. Cardiology is the
  75. chemistry

    Which of the following pairs of molecules have the same oxidation number for carbon? CO and CO2 CH4 and CCl4 C6H12O6 and C(s) H2CO and COCl2 Carbon always has an oxidation number of +4 What mass of CuSO4.5H2O would you need to prepare 250.0 mL of a 0.250 M

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