1. Chemistry

    Alcohol levels in blood can be determined by a redox titration with potassium dichromate according to the balanced equation: C2H5OH(aq) + 2Cr2O7(-2) (aq) + 16H+(aq)---> 2CO2 (g) + 4 Cr3(+)(aq) + 11H2O (l) What is the blood alcohol level in mass perecent
  2. Chemistry

    Alcohol levels in blood can be determined by a redox titration with potassium dichromate according to the balanced equation: C2H5OH(aq) +2Cr2O7-2 (aq) + 16H+(aq)---> 2CO2 (g) + 4 Cr3+ (aq) + 11H2O (l) What is the blood alcohol level in mass perecent if
  3. chemistry

    Laws passed in some states define a drunk driver as one who drives with a blood alcohol level of 0.08% by mass or higher. the level of alocohol can be determinded byt titrating blood plasma with pottasium dichromate according to the unbalanced redox
  4. Chemistry

    A person’s blood alcohol (C2H5OH) level can be determined by titrating a sample of blood plasma with a potassium dichromate solution. The balance is 16H+ (aq) + 2Cr2O72- (aq) + C2H5OH (aq) 4Cr3+ (aq) + 2CO2 (g) + 11H2O (l) If 35.46 mL of 0.05961 M
  5. Statistics

    I need help on this one too. Any one willing to get me started? THANKS! Potassium is a mineral that helps the kidneys function normally. It also plays a key role in cardiac, skeletal, and smooth muscle contraction, making it an important nutrient for
  6. 12th grade chemistry

    It is required to titrate ethanol solution .Being available a 0.2mol/l potassium dichromate solution and 4mol/l sulfuric acid solution on the presence of a convenient indicator. a)indicate the glassware used for titration. b)give a brief description of the
  7. Statistics

    I need help on this one too. Any one willing to get me started? THANKS! Potassium is a mineral that helps the kidneys function normally. It also plays a key role in cardiac, skeletal, and smooth muscle contraction, making it an important nutrient for
  8. Chemistry

    A 2.764 g sample containing only iron and aluminum metal was treated with acid to form Al(+3) and Fe(+2). The sample was then titrated with a potassium dichromate solution (only the Fe(II) will react with the dichromate). The sample was found to be
  9. Chemistry 20

    Determine the amount concentration of potassium ions and dichromate ions in a solution made by dissolving 44.7 g of potassium dichromate to make a volume of 205 mL. Include the balanced chemical equation.
  10. precal

    In sixteen states and the District of Columbia, the legal blood-alcohol level is 0.08. Use the formula A(x) = -0.0082x2 + 0.06x to compute blood-alcohol levels as a function of x (the time in hours). When is the first time that a person can be arrested for
  11. PreCalc

    In sixteen states and the District of Columbia, the legal blood-alcohol level is 0.08. Use the formula A(x) = -0.0082x2 + 0.06x to compute blood-alcohol levels as a function of x (the time in hours). When is the first time that a person can be arrested for
  12. chemistry

    overall balanced reaction: 14H+ + C2O7^2- + 6Fe^2+ -> 2Cr^3+ + 7H2O + 6Fe^3+ .5021g of impure sample containing potassium dichromate was analyzed by titrating a standard iron (II) sulfate solution. If 6.74 mL of 0.2312 N of iron (II) sulfate was
  13. physiology

    The single most important factor influencing potassium ion secretion is a) the potassium ion content in the renal tubule cells b) intracellular sodium levels c) potassium ion concentration in blood plasma d) pH of the ICF c
  14. biology

    5. A researcher finds that blood alcohol levels cause progressive damage to the liver. All the mice in his study were fed the same amount and types of food. Different concentrations of alcohol were injected into each mouse. One group of mice does not
  15. Statistics

    I need help on this one too. Any one willing to get me started? THANKS! Potassium is a mineral that helps the kidneys function normally. It also plays a key role in cardiac, skeletal, and smooth muscle contraction, making it an important nutrient for
  16. chem lab

    KMn04 with iron(II) ammonium sulphate hexahydrate-redox titration. 1-what is the purpose of adding H2SO4 to iron sample before the titration? 2-why is there no indicator used to determine the end point for this titration? 3-suggest another possible
  17. Chemistry

    How much time is required to electroplate 6.530 µg of chromium from a potassium dichromate solution, by using a current of 118 mA? I thought the ratio of e- to moles chromium would be 6/2 but I guess that is wrong? I am using t= nF/A I already made the
  18. Chemistry

    25.0mL of an acidic 0.100 mol/L tin (II) chloride solution required an average volume of 12.7 mL of potassium dichromate solution for a complete reaction. The amount of concentration of the potassium dichromate solution is _______ mmol/L How do you go
  19. Chemistry

    25.0mL of an acidic 0.100 mol/L tin (II) chloride solution required an average volume of 12.7 mL of potassium dichromate solution for a complete reaction. The amount of concentration of the potassium dichromate solution is _______ mmol/L How do you go
  20. Chemistry

    25.0mL of an acidic 0.100 mol/L tin (II) chloride solution required an average volume of 12.7 mL of potassium dichromate solution for a complete reaction. The amount of concentration of the potassium dichromate solution is _______ mmol/L How do you go
  21. Chemistry Help Please!!

    How can you precipitate BaCrO4(s) from a solution of barium nitrate and potassium dichromate? I don't get it.. it's a question from a lab we did on chromate-dichromate equilibrium.
  22. math

    After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.
  23. math

    After several drinks, a person has a blood alcohol level of 220 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 4 hours
  24. math

    After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.
  25. math

    After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.
  26. math

    After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.
  27. math

    After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.
  28. health

    A 67 year old man is diagnosed with cancer subsequently undergoes chemotherapy. As an excpected side affect of chemotherapy, his bone marrow stops functioning. What ia a potential consequence of this loss of function? A. his calcium levels will decrease.
  29. body systems

    A 67-year-old man is diagnosed with cancer and subsequently undergoes chemotherapy. As an expected side effect of chemotherapy, his bone marrow stops functioning. What is a potential consequence of this loss of function? A. His calcium levels will
  30. chemistry

    when acidified potassium dichromate (VI) is added to iron(II) sulfate why does a redox reaction occur? How about if ammonia is added to iron(II) sulfate?
  31. Chemistry

    What is the molarity of this dichromate solution? A potassium dichromate solution of an unknown molarity was used to titrate a solution of FeSO4 prepared by dissolving a 0.350g of pure iron wire in H2SO4 and reducing the FE3+ produced to FE2+. 36.24 mL of
  32. Chemistry

    7) A 3.33 g sample of iron ore is transformed into a solution of iron (II) sulfate. And this solution is titrated with 0.0150 M potassium dichromate. If it requires 41.40 mL potassium dichromate solution to titrate the FeSO4, find the percentage of iron in
  33. science

    How do blood O2 levels, CO2 levels and PH effect ventilation? Where are the receptors that monitor blood gases located and what do these receptors actually respond to? What blood gas is most closely monitored by the body? Given what you know about blood
  34. Organic Chemistry

    We used sodium dichromate in sulfuric acid to oxidize borneol to camphor. Suppose you needed to prepare benzaldehyde from benzyl alcohol. Would the sodium dichromate be the best choice for this oxidation or are there better choices? Explain.
  35. Analytical chemistry

    an 0.5031 gram sample of iron ore is determined through redox titration using K2Cr2O7. The sample was dissolved in HCl and all the iron was converted to the 2+ state. Titration to the endpoint required 24.34 mL of 0.01887 mol/L K2Cr2O7. Calculate the
  36. college chemistry MEASURMENTS

    some states have reduced the legal limit for alcohol sobriety from 0.10% to 0.08% alcohol by volume in blood plasma. a) how many mL of alcohol are in 3.0 qt of blood plasma at the lower legal limit? b)how many lL of alchol are in 3.0 qt of blood plasma at
  37. anatomy

    levels of potassium in the blood increase when aldosterone is made. A. true B. false
  38. chemistry

    what is the balanced equation for the reaction of potassium dichromate and potassium hydrogen phthalate?
  39. Chem question Redox Stoichiometry

    A 2.80 mol/L solution of iron (II) dichromate is combined with 5.00L of a 2.25 mol/L acidic solution of tin (II) bromide. Calculate the volume of iron (II) dichromate required. FeCr2O7 + SnBr2 --> SnCr2O7 + FeBr2 Is this the right formula? or no?
  40. Chemistry

    a potassium dichromate is prepared by 0.3525grams of K2Cr2O7 is enough water to yield 250.0mL of solution. a student then measures 10.00mL of an unknown solution of Fe2+ into an erlenmeyer flask and dilutes with 90mL of 1.0M hydrochloric acid. she then
  41. chemistry 116

    Suppose someone had an excessive Friday evening drinking party and then did the ultra-dumb thing of driving home while drunk. Luckily, the person got pulled over by the police before they can injure anyone else. The police took a blood alcohol reading of
  42. Chem Lab

    Suggest another possible oxidising agent and reducing agent that can be used to replace potassium permanganate & iron (II) ammonium sulphate haxahydrate in experiment Redox Titration
  43. chemistry

    Can someone make sure that I am correct with my first solution? Also I need help with the 2nd problem. I am a little confused about where to begin. 1.) 1.7423g of potassium dichromate were placed in a 250.00 mL volumetric flask and water was added to the
  44. Nutrition

    I am needing to know what effects caffeine and alcohol have on hydration levels in the body. Any help would be appricaiated! (Broken Link Removed) Alcohol dehydrates, but fortuantly, alcohol is often consumed with a lot of diluting water, so the effect is
  45. chemistry

    Fe2+ is oxidized to Fe3+ and CrO4is reduced to Cr3+ using an unknown sample containing Fe2+ and 0.04322M K2CrO4 solution in a redox titration. I first need to balance the formula, but I don't know what to do with the potassium.
  46. chemistry

    The amount of Fe in a 2.0008 g sample of an iron ore was determined by a redox titration with K2Cr2O7. The sample was dissolved in HCl and the iron brought to a +2 oxidation state. Titration required 26.48 mL of 0.034 M K2Cr2O7. Calculate the iron content
  47. Forensic Science

    If there are 45 drops of alcohol/mL, and the density of alcohol is 0.789 g/mL, what is the blood alcohol concentration of your unknown sample?
  48. Chemistry

    0.125g of sodium dichromate is to be reacted wtih 0.025M potassium iodide. How many mLs of the potassium iodide solution will be needed.
  49. chemistry

    0.125g of sodium dichromate is to be reacted wtih 0.025M potassium iodide. How many mLs of the potassium iodide solution will be needed. (Use your balanced equations above.)
  50. science

    The mass of a beaker containing a sample of sodium dichromate was determined to be 68.9 g. After transferring a sample it weighed 56.424 g.Determine the mass (g) of sodium dichromate transferred to the correct number of decimal places
  51. Chemistry

    I got this question wrong, and I'm not sure where my mistakes lie. Can someone show me what I'm not doing right and what the correct answers should be? "Some states have reduced the legal limit for alcohol sobriety from 0.10% to 0.080% alcohol by volume in
  52. Health/SCI302

    1. Compare and contrast how different electrolytes—sodium, potassium, and chloride—function in the body. 2. What effects might alcohol and caffeine have on hydration levels in the body?
  53. Chemistry Lab

    I need help with the third part The chemical method of analysis in determination of the blood alcohol content (%BAC) is: K2Cr2O7 + H2SO4 + C2H5OH → Cr2(SO4)3 + K2SO4 + CH3COOH + H2O What are the stoichiometric coefficients for the reaction above?
  54. chemistry

    hello i'm doing a redox stoichiometry lab having to do with titration 6H +5H2O2 + 2MnO4 -- 5O2 + 2Mn2+ + 8H2O Why is H2O2 the source of O2 product in this titration?
  55. chemistry

    Which of the following statements best describes p orbitals? a dumbbell with a ring around it a sphere around the nucleus a four-leave clover two lobes apposing each other Examine the three isotopes of potassium (K) below. potassium-41, potassium-39,
  56. fgcu

    More than a decade ago, high levels of lead in the blood put 88% of children at risk. A concerted effort was made to remove lead from the environment. Now, suppose only 12% of children in the United States are at risk of high blood-lead levels. (a) In a
  57. AP Chemistry

    redox reaction: Hydrogen peroxide is added to an acidified solution of potassium permanganate. what is the total redox reaction?
  58. ap chemistry

    what is the galvanic cell for the redox reaction between sodium dichromate and mercury(I) nitrate in an acidic solution.
  59. algebra

    Medical research indicates that the risk of having a car accident increases exponentially as the concentration of alcohol in the blood increases. The risk is modeled by R=6e^12.77x Where x is the blood alcohol concentration and R, given as a percent, is
  60. Algebra

    Medical research indicates that the risk of having a car accident increases exponentially as the concentration of alcohol in the blood increases. The risk is modeled by R=6e^12.77x Where x is the blood alcohol concentration and R, given as a percent, is
  61. Living a Healthy Life

    Blood pressure is a measure of A. oxygen levels in the blood. B. the ratio of red blood cells to white blood cells. C. how hard the heart is working. D. the pressure exerted by hemoglobin against the vascular walls. D.
  62. Living a Healthy Life

    Blood pressure is a measure of  A. oxygen levels in the blood.  B. the ratio of red blood cells to white blood cells.  C. how hard the heart is working.  D. the pressure exerted by hemoglobin against the vascular walls.  D.
  63. SCIENCE

    HOW TO PREPARE 60PPM OF POTASSIUM DICHROMATE
  64. Statistics

    Suppose that more than a decade ago high levels of lead in the blood put 81 percent of children at risk. A concerted effort was made to remove lead from the environment. Suppose, according to a survey, only 5 percent of children in the United States are at
  65. statistics

    In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. More than a decade ago, high levels of lead in the blood put 89% of children
  66. Statistic

    In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. More than a decade ago, high levels of lead in the blood put 87% of children
  67. Statistics

    In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. More than a decade ago, high levels of lead in the blood put 87% of children
  68. chemistry

    Can anyone give me a brief explanation about redox? I'm just not understanding any of it. How do you know if a reaction is redox or non redox....how do you know what would be reduced? I am just confused with the redox subject. Any direction?
  69. Science

    Reaction between potassium dichromate and sulphur dioxide gas??
  70. Science

    Reaction between potassium dichromate and sulphir dioxide gas?
  71. Chemistry

    Describe how you would make a 125 mL of 0.025 M solution of potassium dichromate?
  72. chemistry

    How can you precipitate BaCrO4(s) from a solution of barium nitrate and potassium dichromate?
  73. Chemistry

    How many grams of K2Cr2O7 (Potassium dichromate) must be used to make 250 ml of a0.125 M solution?
  74. Chemistry

    how many grams of potassium dichromate are needed to make 250 mL of a 0.75 molar solution?
  75. Chemistry

    how many grams of potassium dichromate are needed to make 250 mL of a 0.75 molar solution?
  76. Calculus

    The blood alcohol concentration after a drink has been consumed can be modelled by c(t)=(0.02t)e^(−0.05t) where t is the time in minutes elapsed after the consumption of the drink and c(t) is the concentration in mg/mL at t. At what time in the first
  77. Statistics

    Using the below information calculate the conditional probability of C given each of the age groups, or P(C/D), P (C/E), etc. Compare these probabilities and speculate as to which age groups seem more likely than others to have been (according to the legal
  78. blood/science

    how are blood types determined? A. marker mocules marked on red blood cells B. Marker mocules marked on white blood cells C. Plasma fibrin's precense D. Blood available for transfusion
  79. Chemistry

    someone help pls!! percentage of ethanol in the "blood" sample on a v/v basis is 0.0143% v/v. is the "blood" sample analysed over the limit for driving? (legal limit is 80mg alcohol per 100mL blood. assume the density of ethanol is 0.785g/mL and the
  80. Chemistry

    In the reaction of AL metal with aqueous potassium hydroxide, what type of reaction is occurring? -REDOX, Al metal is being reduced or -REDOX, Al metal is being oxidized.
  81. CHM 300

    Experiment: Redox titration;determination of ascorbic acid by an iodometric back-titration Why is sodium carbonate added to the thiosulfate solution ? why is the water used for preparing the thiosulfate solution boiled ?
  82. chem

    The amount of iron in a meteorite was determined by a redox titration using KMnO4 as the titrant. A 0.4408 g sample was dissolved in acid and the liberated Fe3+ quantitatively reduced to Fe2+. Titrating with 0.0220 M KMnO4 requires 41.38 ml to reach the
  83. chem

    methanoic acid react with potassium dichromate to form what? A colorless solution and CO2 is formed as known
  84. Chemistry

    FB1 is a solution containing a mixture of potassium carbonate and sodium hydrogen carbonate . 25cm^3 of this mixture was to titrated against 0.250mol/dm^3 solution of HCL. In one titration using phenolphthalein as indicator, 10.00cm^3 of the acid was
  85. HELP

    Why is water essential to health maintenance? o What are the functions of water in the body? o What happens to the body when it does not get the water it needs? o Compare and contrast how different electrolytes—sodium, potassium, and chloride—function
  86. SCI

    Why is water essential to health maintenance? o What are the functions of water in the body? o What happens to the body when it does not get the water it needs? o Compare and contrast how different electrolytes—sodium, potassium, and chloride—function
  87. intro to chem

    The molarity of an aqueous solution of potassium hydroxide, KOH, is determined by titration against a 0.197 M HI solution. If 28.4 mL of the base are required to neutralize 18.6 mL of HI, what is the molarity of the KOH solution?
  88. chemistry

    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)
  89. Chemistry

    Redox Titrations I did a redox titration of NaBO3 with KMnO4. I used a .0545 M NaBO3 solution, and an average of .026 L of .01M KMnO4. I have to standardize the KMnO4 solution, does anyone know how to do this?
  90. Chemistry

    I am not sure if I calculated the exact molarity of the potassium permanganate. I multiplied the molarity of the potassium permanganate by the liters of potassium permanganate used in the titration and divided it by the total liters of solution. I don't
  91. Chemistry

    I am not sure if I calculated the exact molarity of the potassium permanganate. I multiplied the molarity of the potassium permanganate by the liters of potassium permanganate used in the titration and divided it by the total liters of solution. I don't
  92. Ap chemistry

    A 20mL sample of .200M potassium dichromate solution is added to 30 ml of .4M silver nitrate. What is the balnced molecular equation?
  93. chemistry

    calculate the mass given element of each of the following compounds a) brimine in 50.0 potassium bromide, KBr b) Chromium in 1.00 kg sodium dichromate Na2Cr2O7
  94. chemistry

    hello i'm doing a redox stoichiometry lab having to do with titration so we are given these two equations: 6 H + 3H2O2 + 2MnO4 ---> 4O2 + 2Mn + 6 H2O 6H + 5H2O2 + 2MnO4 --> 5O2 + 2Mn + 8 H2O it asks which reactant is the source of the O2 product in
  95. College anatomy

    It was observed that blood glucose levels were falling in an individual. This event would be sensed by (a) cells in the (b) of the pancreas, causing them to release the hormone (c). This series of events would be part of an (d) loop/mechanism, serving as a
  96. chemistry

    Reaction with Felings solution,if adding 2-butanol to potassium dichromate, in this experiment what spiecfic organic product would be form and structure.
  97. AP CHEM

    Please help me with thses AP CHEM homework problems and show the steps to how to find the solutions: Solid Liquid Titrations: Determine the concentration of the indicated liquid unknown given the mass of a solid standard and the buret data for the
  98. health

    Which of the following statements about alcohol is true? A. Alcoholic beverages should be consumed to lower health risks such as heart attacks. B. Light beer contains fewer calories but more alcohol content than regular beer. C. Excessive alcohol
  99. Science

    Human blood type is determined by co-dominant alleles. There are three different alleles, know as I^a and I^b alleles are co-dominant and the i allele is recessive. The possible human phenotypes for blood group are type A, type B, type AB, or type O. Type
  100. math

    Lead Contamination More than a decade ago high levels of lead in the blood put 88% of children at risk. A concerted effort was made to remove lead from the environment. In a random sample of 200 children taken more than a decade ago, what is the