1. Health, Safety, and Nutrition

    Which if the following is a mandatory standard? (1 point) 1) Food Labels 2) National Health and Safety Standard 3) dietary reference 4) Childmand adult care food program *Havng a hard time finding it in the book

    asked by Ellie on September 30, 2015
  2. Chemistry

    At 298K, 2PCl3(g)+O2(g)---> 2POCl3(l) Delta H= -620.2kJ for the reaction and the standard molar entropies are ,PCl3(g)= 311.8J/K,O2(g)= 205.1J/K and POCl3(l)=222.4J/K. Determine the standard free energy change at 298K.

    asked by PM221 on April 15, 2011
  3. Ap chemistry

    The standard enthalpy of formation of Mn2O3 is −962.3 kJ/mol. How much heat energy is liberated when 6.4 grams of man- ganese are oxidized by oxygen gas to Mn2O3 at standard state conditions? Answer in units of kJ

    asked by Gabriella on October 29, 2013
  4. statistic

    Using the 68-95-99.7 rule: Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: a. Percentage of scores less than 100 b. Relative frequency of

    asked by Sonia on August 24, 2011
  5. Statistics

    A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 460 seconds and a standard deviation of 40 seconds.

    asked by Daniela on October 24, 2012
  6. chemistry

    3. Calculate the standard entropy change for the reaction: N2 + 3H2 → 2NH3 given the standard entropies Sº(N2)(g) = 191.6 J K^-1 mol^-1 Sº(H2)(g) = 130.6 J K^-1 mol^-1 Sº(NH3)(g) = 193.3 J K^-1 mol^-1

    asked by John on July 19, 2014
  7. MATHS STATISTICS

    B. A soft-drink vending machine is supposed to pour 8 ounces of the drink into a paper cup. However, the actual amount poured into a cup varies. The amount poured into a cup follows a normal distribution with a mean that can be set to any desired amount by

    asked by DON on May 13, 2013
  8. Statistics

    Data is collected from a large city. The growth of adolescents over the course of puberty is normally distributed with a mean of 5.26 and a standard deviation of 0.50 inches. a) what percentage of adolescents in this city grew less than 4.5 inches? b) what

    asked by Judy on July 9, 2008
  9. Math

    1. Abundance of starfish on a rock platform was studied by the quadrat method. The quadrat was a plastic frame with an area of 0.25 meter square. The rock platform was a rectangle approximately 20m x 30m. The numbers of starfish in 10 quadrat "drops" were:

    asked by MaebelXD on March 29, 2012
  10. Math

    The birth weight of full-term babies was found to follow a normal distribution with a mean of 3500grams, and standard deviation of 600grams. A) What is probability that the birth weight is less than 3000 grams. = P(X4000) Correct? C) birth weight between

    asked by Brandy on November 5, 2015
  11. Statistics

    The Graduate Record Examination (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. For each of the following problems: 1. Draw a rough sketch,

    asked by Jill on September 22, 2014
  12. Statistics

    The average U.S. yearly capita consumption of citrus fruit is 26.8 pounds. Suppose that the distribution of fruit amounts consumed is bell shaped with a standard deviation equal to 4.2 pounds. a. What percentage of Americans would you expect to consume

    asked by Marnee on July 20, 2017
  13. statistics

    Help!!I have tried this several times and come up with wrong answer. WHAT PERCENTAGE OF A NORMAL DISTIBUTION IS GREATER THAN THE MEAN? (GIVE ANSWER TO NEAREST PERCENT)THIS ONE I GOT 68% AND IT WRONG... AND WHAT PERCENTAGE IS GREATER THAN A VALUE THAT IS 1

    asked by Sue on May 25, 2013
  14. statistics

    Consider a 95% confidence interval for a population mean constructed from a random sample of 250 observations taken from a Normal population. Sigma is known to be 14. If we were to construct another 95% confidence interval, this time using 1,000

    asked by AMY on February 20, 2011
  15. statistics

    Consider a 95% confidence interval for a population mean constructed from a random sample of 250 observations taken from a Normal population. Sigma is known to be 14. If we were to construct another 95% confidence interval, this time using 1,000

    asked by AMY on February 20, 2011
  16. Analyzing Data (HELP!!)

    Multiplying Rabbits Suppose that a pair of rabbits produces six offsrping: 3 males and 3 females. Assumes that no offspring die. 1. If each pair of rabbits breeds only once, how many offspring would be produced each year for 5 generations? 2. Construct a

    asked by Jen on October 8, 2012
  17. Science

    Multiplying Rabbits Suppose that a pair of rabbits produces six offsrping: 3 males and 3 females. Assumes that no offspring die. 1. If each pair of rabbits breeds only once, how many offspring would be produced each year for 5 generations? 2. Construct a

    asked by Becky on March 8, 2016
  18. Analyzing Data

    Multiplying Rabbits Suppose that a pair of rabbits produces six offsrping: 3 males and 3 females. Assumes that no offspring die. 1. If each pair of rabbits breeds only once, how many offspring would be produced each year for 5 generations? 2. Construct a

    asked by NEED HELP on October 8, 2012
  19. Geography

    Whereas reapportionment adjusts the amount of political representation give to a certain geographical area, redistricting adjusts A) country, state and/or county boundaries. B) population size. C) the gerrymander. D) Federal lands. E) the geographical

    asked by Elizabeth on March 26, 2016
  20. Chemistry

    The population of San Francisco is 750,000 in an area of 49 square miles. What is the population density in San Francisco? Express your answer in people per acre. ( 1mi(squared) = 640 acres ) 49 sq mi x (640 acres/1 sq mi) =?? acres. (Note that sq mi

    asked by Jamie on September 13, 2006
  21. Math

    The population (in millions) and the violent crime rate (per 1000) were recorded for 10 metropolitan areas. The data are shown in the following table. Do these data provide evidence to reject the null hypothesis that ƒÏ = 0 in favor of ƒÏ ‚ 0 at

    asked by Tracy on June 27, 2013
  22. stats

    An analysis is done to determine the amount spent on fresh fruits and vegetables per person per week. In a certain area, assume this amount is normally distributed with a mean of $13.9 and a standard deviation of $ 4.91. A. When finding the probability

    asked by ff on October 10, 2010
  23. statistics

    A simple random sample of size n = 300 is obtained from a population whose size is and whose population size is n=20,000 ans whose proportion with a specified characteristic is p=0.8. Describe the sampling distribution of P^. A) Approximately normal; ìp =

    asked by jackie on March 1, 2011
  24. Chemistry

    The standard free energy of activation of a reaction A is 73.4 kJ mol–1 (17.5 kcal mol–1) at 298 K. Reaction B is one million times faster than reaction A at the same temperature. The products of each reaction are 10.0 kJ mol–1 (2.39 kcal mol–1)

    asked by Breauna on September 8, 2014
  25. math

    I am having trouble solving this problem. In 1994, the population of the Las Vegas metropolitan area was about 1,076,000 with an average annual growth rate of 6.5%. Assume this growth rate continues into the future. I have to estimate the population of Las

    asked by Vanessa on February 27, 2008
  26. Science - HW qs. check

    6. What happened to the population of deer when the wolves were introduced? Explain why? When the wolves are introduced, the population of deer will decrease because wolves eat deers??? right?????

    asked by Laruen on June 3, 2012
  27. statistics

    Data shows that 93% of the people in a certain population are right-handed. A group of 9 people from this population are selected at random. What is the probability that exactly 7 of the people in the group are right-handed? 2

    asked by mark on March 21, 2011
  28. Pre-Calculus

    The table below shows a frequency distribution of the number of pickup trucks sold at 85 truck dealerships in Maine over an 18-month period. Number of trucks sold/Number of dealerships: 70-90/2 90-110/11 110-130/39 130-150/17 150-170/9 170-190/7 Find the

    asked by Mary on October 26, 2008
  29. Pre-Calculus

    The table below shows a frequency distribution of the number of pickup trucks sold at 85 truck dealerships in Maine over an 18-month period. Number of trucks sold/Number of dealerships: 70-90/2 90-110/11 110-130/39 130-150/17 150-170/9 170-190/7 Find the

    asked by Mary on October 30, 2008
  30. Statistics

    An automatic machine in a manufacturing process is operating properly if the length of an important subcomponent is normally distributed with a mean μ = 80 cm and a standard deviation σ = 2 cm. a) Find the probability that the length of one randomly

    asked by Lia on April 22, 2015
  31. statistics

    Consider the data from an unknown distribution: 40.68, 32.15, 36.91, 29.00, 35.58, 41.55, 33.83, 29.07, 41.00, 37.68, 41.23, 37.54, 40.33, 36.82, 35.18, 31.67, 38.55, 38.34, 35.86, 40.45, 37.28, 36.65, 32.12, 32.96, 37.65, 39.44, 46.18, 24.21, 42.35,

    asked by lisa on May 19, 2016
  32. statistics

    For the major airlines, 21% of all flights depart at least 15 minutes late with a standard deviation of 5%. Currently, 24% of all American Airlines flights depart at least 15 minutes late. If American wants to be in the top 10% of all major airlines with

    asked by carolyn on June 29, 2012
  33. History

    Which aftereffect of Americanization helps China compete in today’s expanding global marketplace? A) Over half of China’s rural population was attracted to urban areas. B) Chinese designers understand the American commercial market. C) China now has

    asked by Portia on September 25, 2018
  34. statistics

    The personnel office at a large electronics firm regularly schedules job interviews and maintains records of the interviews. From the past records, they have found that the length of a first interview is normally distributed, with mean μ = 31 minutes and

    asked by larae on February 18, 2014
  35. statistics

    A construction zone on Kings Road has a posted speed of 45 kilometers per hour. The speeds of vehicle passing through this construction zone are normally distributed with a mean of 46 kilometers per hour and a standard deviation of 4 kilometers per hour.

    asked by Nesa on May 11, 2012
  36. stats help!

    suppose the number of customer complaints per day on the morning shift (6am-12) at Murph's Coffee is distributed as follows: Complaints f(x) 0 .3 1 ??? 2 .2 a) what is the value of ??? b)what is the average number of complaints per day on the morning

    asked by Sam on January 13, 2011
  37. Geography

    which question would best help you analyze the population density of north korea? You have to choose 3 correct answers. How many square miles does East Asia covers?

    asked by Maria on February 10, 2016
  38. statistics

    Randomly selected students participated in an experiment to test their ability to determine when one minute(or sixty seconds) has passed. Forty students yielded a sample mean of 61.8 seconds. Assuming that o= 11.7 seconds, Construct and interpret a 99%

    asked by anonymous on November 17, 2013
  39. Stats.

    For this section, use the following distributions: 1) A direwolf has a 70% probability of killing a stag upon encounter; 2) a dire wolf awakens the village on average 1.2 times per six weeks; 3) a dire wolf will eat an amount that is uniformly distributed

    asked by Kathleen on September 21, 2016
  40. statistics

    For each of the following questions, decide whether or not the sample data can be used to construct a confidence interval. How do I go about determining if the sample data can be used to construct a confidence interval? Example: To help consumers assess

    asked by Carol on October 17, 2012
  41. Pre Calculus 1

    thirty percent of a radioactive substance decays in four years. assuming the decay is exponential, find the half life of the substance. the beginning of 1975 the population of a country was 40 million and growing at a rate of 3% per year. Assume that the

    asked by Yasmine on November 18, 2015
  42. Geography

    Why would countries be concerned with their population decreasing? Why would countries be concerned with their population increasing?

    asked by Anonymous on November 8, 2015
  43. Statistics

    An automobile in surer has found that repair claims have a mean of $1520 and a stardard deviation of $770. Suppose that the next 100 claims can be ragarded as a random sample from the long-run claims process 1. What is the mean and standrd deviation of the

    asked by Kim on October 31, 2008
  44. Math

    Say for example that you need to find out the number of people that need emergency housing for in a neighbourhood. would you multiply the population of the area by the total percentage of risk. ex. barnyard population 325 risk is 40% ... do you go 325 time

    asked by Karley on September 28, 2008
  45. Statistics

    Please I Need Help With This Question Showing All Steps...Thank You :) The average number of units that the factory workers at Benzo company assemble per week is μ = 45 with a standard deviation of σ = 12. Assume that the distribution of units assembled

    asked by Anonymous on August 2, 2011
  46. Statistics/probability/maths

    Please I Need Help With This Question Showing All Steps...Thank You :) The average number of units that the factory workers at Benzo company assemble per week is μ = 45 with a standard deviation of σ = 12. Assume that the distribution of units assembled

    asked by evangeline johnny on August 2, 2011
  47. statistics

    Winnipeg Tribune claims that the time of travel from downtown to the University via the Pembina bus has an average of µ = 27 minutes. A student who normally takes this bus believes that µ is greater than 27 minutes. A sample of six ride-times taken to

    asked by hmoney on April 15, 2019
  48. check geo.

    what are ice ages? A)periods of time glaciers receded to cover only the poles. B)eras during which earths orbit kept the planet far from the sun. C)periods of time when glaciers covered much of the earth. D)times when human and animal life thrived in high

    asked by henry on August 8, 2009
  49. check geo.

    what are ice ages? A)periods of time glaciers receded to cover only the poles. B)eras during which earths orbit kept the planet far from the sun. C)periods of time when glaciers covered much of the earth. D)times when human and animal life thrived in high

    asked by henry on August 8, 2009
  50. Texas State History

    How did the Treaty of Paris affect life in Spanish Texas? A) Missions were moved and a large effort was made to increase the population of Spanish Texas. B) The United States took over a large part of eastern Texas. C) Most settlers decided to moveout the

    asked by Purple-pin on September 25, 2018
  51. Statistic

    birth weight of infants: a health care professional wishes to estimate the birth weights of infants. the researcher desires to be 99% confident that the true mean is within 2.5 ounces of the sample mean. the standard deviation of infant birth wieghts is

    asked by Anonymous on September 1, 2012
  52. Statistics

    1. For the following exercise, complete the following by using the data sets below that provides the ages of the first seven presidents: a. Find the mean, median, and range for each of the two data sets. b. Find the standard deviation using the range rule

    asked by Anonymous on July 7, 2010
  53. Statistic

    birth weight of infants: a health care professional wishes to estimate the birth weights of infants. the researcher desires to be 99% confident that the true mean is within 2.5 ounces of the sample mean. the standard deviation of infant birth wieghts is

    asked by Telicia on September 1, 2012
  54. Reposted: Math (for "google"

    In many families both parents work, as a result there is increasing need for day care. Data was collected; and one year in Canada approximately 32% of children aged 0 to 11 years were in day care for at least 20h per week. What is the probability, in a

    asked by Writeacher on June 6, 2007
  55. math

    Algebraically analyze the graph of the function f(x)= -6x^2+5x+2 . Find the vertex, axis of symmetry, range, minimum or maximum value, increasing and decreasing intervals, and zeros. Write the Quadratic equation in standard form. [Standard form is:

    asked by shannon on September 30, 2008
  56. Chemistry

    The electrochemical cell described by the balanced chemical equation has a standard emf (electromotive force) of -0.35 V. Calculate the value (J) for the Wmax that the cell can do under standard conditions. Round your answer to 3 significant figures.

    asked by Roger on December 3, 2010
  57. Science

    Many portable gas heaters and grills use propane, C3H8(g), as a fuel. Using standard enthalpies of formation, calculate the quantity of heat produced when 11.90 g of propane is completely combusted in air under standard conditions. I got -600 kj but its

    asked by Samantha on November 7, 2012
  58. statistik

    the average starting salary of this yaer's graduates of a large university (LU)is $25000 with a standard deviation of $5000.futhermore,it is known that the starting salaries are normally distributed. a)what is the probability that a randomly selected LU

    asked by mira on November 28, 2012
  59. chemistry

    the standard enthalpy of formation, for HCOOH(l)is equal to the standard enthalpy for which reaction?

    asked by Achan on July 9, 2016
  60. Chemistry-Lab-

    I have a question asking what the importance of a standard along other samples is. I''m really unsure as to why a standard is important with other samples. thank you.

    asked by Fizza ASAP on October 1, 2011
  61. 8th grade math

    How do you turn these equation into a standard form? this is the standard form: ax+by=c here are the following equations: 2x = y + 1/2 y - 2 = 1/4x + 1 3y + 3 = 6x - 15 Please help and explain. Thank you.

    asked by saranghae12 on March 4, 2012
  62. Algebra

    how would you write y=8 in standard form of a linear equation? *isnt it already in standard form?????*

    asked by nicole on November 13, 2013
  63. Statistics

    Accrotime is a manufacturer of quartz crystal watches. Accrotime researchers have shown that the watches have an average life of 32 months before certain electronic components deteriorate, causing the watch to become unreliable. The standard deviation of

    asked by Amy on November 16, 2016
  64. Math

    1. Cystic fibrosis (CF), a life-threatening lung disease, is caused from the inheritance of a recessive allele from both parents for the CFTR gene. In order for this disease to manifest itself, one needs to be homozygous recessive for this autosomal gene.

    asked by Bella on October 25, 2015
  65. Math

    We believe that 77% of the population of all Business Statistics I students consider statistics to be an exciting subject. Suppose we randomly and independently selected 38 students from the population. If the true percentage is really 77​%, find

    asked by .... on October 25, 2017
  66. statistics

    Go to a local library; collect a sample of books consisting of the ages of book (based on copyright dates). Plan and describe the sampling procedure, then use the results to construct a confidence interval estimate of the mean age of all books in the

    asked by jen on June 26, 2015
  67. Math

    The population of Bumpton increased by 10% from 1980 to 1990 and decreased by 10% from 1990 to 2000 what is the net percent change in the population on Bumpton from 1980 to 2000 ?

    asked by Jay on July 6, 2009
  68. Statistics

    Many dairy cows now receive injections of BST, a hormone intended to spur greater milk production. A group of 53 Jersey cows increased average milk production from 43 to 52 pounds per day, with a standard deviation of 4.8 lbs. Is this evidence that the

    asked by Katie on November 24, 2013
  69. statistics

    Assuming that the population variances are equal for Male and Female GPA’s, test the following sample data to see if Male and Female PhD candidate GPA’s (Means) are equal. Conduct a two-tail hypothesis test at á =.01 to determine whether the sample

    asked by Anonymous on October 6, 2010
  70. Statistics

    1. The mean monthly mortgage paid by all home owners in a town is $2365 with a standard deviation of $340. a) Using Chebyshev’s theorem, find at least what percentage of all home owners in this town pay a monthly mortgage of (i) $1685 to $3045 & (ii)

    asked by David on June 11, 2013
  71. SCIENTIFIC NOTATION

    Japan and Fiji are both island countries. The population of Japan is approximately 1.3*10^8. The population of Fiji is approximately 8.8*10^5. Which is the best estimate of how many times as great the population of Japan is as Fiji? A about 1.5 times as

    asked by Anonymous on April 15, 2015
  72. Stat

    The army reports that the distribution of head circumfererence among soldiers is approximately Normal with mean 22.8 inches and standard deviation 1.1 inches. Helmets are mass produced for all except the smallest 5 % and the largest 5 % of head sizes.

    asked by Stat (Alegra One Help I think) on September 21, 2009
  73. Math

    Suppose that the number of bacteria in a certain population increases according to an exponential growth model. A sample of 2600 bacteria selected from this population reached the size of 2873 bacteria in two and a half hours. Find the continuous growth

    asked by Rachal on February 21, 2011
  74. BIO 100

    Write a 200-300 word response addressing the following points: What is the current estimate of the worldwide human population at this moment? Describe how this number is changing moment-to-moment, day-to-day, and from one year to the next. Describe how the

    asked by Rayna on December 22, 2009
  75. economics

    Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western

    asked by miguel on September 8, 2014
  76. economics 6

    Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western

    asked by Mia on September 7, 2014
  77. statistics

    The National Highway Traffic Safety Administration analyzes the crash test data for new cars. One variable measured is the severity of the injury due to a collision. The higher the severity, the higher the points assigned. Assume that the injury rating is

    asked by Jerome on June 23, 2013
  78. Economics. (6)

    Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western

    asked by Vanessa on September 5, 2014
  79. Statistics

    The National Highway Traffic Safety Administration analyzes the crash test data for new cars. One variable measured is the severity of the injury due to a collision. The higher the severity, the higher the points assigned. Assume that the injury rating is

    asked by Gwen on December 22, 2013
  80. economics 6

    Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western

    asked by Mia on September 5, 2014
  81. economics 6

    Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western

    asked by Alejandra on September 7, 2014
  82. economics 6

    Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western

    asked by miguel on September 8, 2014
  83. Economics 6

    Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western

    asked by Vanessa on September 9, 2014
  84. economics 6 PLEASE HELP ME?

    Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western

    asked by Vanessa on September 9, 2014
  85. economics 6

    Annual per capita consumption of milk is 21.6 gallons (Statistical Abstract of the United States: 2006). Being from the Midwest, you believe milk consumption is higher there and wish to support your opinion. A sample of 16 individuals from the mid western

    asked by Mia on September 4, 2014
  86. statistics

    After years of data collection by college students, it has been determined that the distribution of course grades in Ms. Green’s Statistic II class follows a normal distribution with a mean of 62 and a standard deviation of 14. (a) A student will pass

    asked by Karen on May 9, 2011
  87. Math

    What part of the school population likes basketball,baseball,or football? How much larger is this then the part of the student population that prefers soccer? Football 3/12 Basketball 4/12 Soccer 3/12 Baseball 2/2 Answer:1/2? Simplify the fraction if

    asked by Jerald on October 23, 2012
  88. statistics

    The Deborah Heart Institute performs many open-heart surgery procedures. Recently research physicians at the Institute developed a new heart bypass procedure that they believe reduces the average length of recovery. The hospital board will not adopt the

    asked by Walter on April 18, 2012
  89. Stats

    The workers union at a certain university is quite strong. About 94% of all workers employed by the university belong to the workers union. Recently, the workers went on strike and now a local TV station plans to interview a sample of 20 workers ,chosen at

    asked by Riley on October 1, 2016
  90. STATISTICS PLEASE HELP!!!!!

    are you a chocolate "purist", or do you like other ingredients in your chocolate? american demographics reports that almost 75% of consumers like traditional ingredients such as nuts or caramel in their chocolate. they are less enthusiastic about the taste

    asked by Brittany on November 3, 2010
  91. statistics

    We believe that 77% of the population of all Business Statistics I students consider statistics to be an exciting subject. Suppose we randomly and independently selected 40 students from the population. If the true percentage is really 77%, find the

    asked by yamini on August 8, 2010
  92. environmental science

    Explain the main point concerning exponential growth and whether it is good or bad. Compare exponential growth to a logistic growth curve and explain how these might apply to human population growth. What promotes exponential growth? What constrains

    asked by len on November 2, 2011
  93. Math

    We believe that 77​% of the population of all Business Statistics I students consider statistics to be an exciting subject. Suppose we randomly and independently selected 38 students from the population. If the true percentage is really 77​%, find the

    asked by Promise on October 24, 2017
  94. Chemistry

    Using standard enthalpies information, calculate the standard enthalpy change for this reaction: a) (thermite reaction) 2Al(s) + Fe2O3(s) = Al2O3(s) + 2Fe(s) b) Mg(OH)2(s) = MgO(s) + H2O(I) c) N2O4(g) + 4H2(g) = N2(g) + 4H2O(g) d) SiCl4(I) + 2H2O(I) =

    asked by Brett on July 3, 2014
  95. Chemistry

    Using standard enthalpies information, calculate the standard enthalpy change for this reaction. a)(thermite reaction) 2Al(s) + Fe2O3(s) = Al2O3(s) + 2Fe(s) b)Mg(OH)2(s) = MgO(s) + H2O(I) c)N2O4(g) + 4H2(g) = N2(g) + 4H2O(g) d)SiCl4(I) + 2H2O(I) = SiO2(s)

    asked by Dan on July 3, 2014
  96. stats

    The population (in millions) and the violent crime rate (per 1000) were recorded for 10 metropolitan areas. The data are shown in the following table. Do these data provide evidence to reject the null hypothesis that ƒÏ = 0 in favor of ƒÏ ‚ 0 at

    asked by sarah on October 30, 2013
  97. Science - Homework Qs.

    2. What happens to the population of a species when these resources decrease? my answer - when the resources decrease the population of the species will be dead right?????? (please be honest)

    asked by Laruen on June 3, 2012
  98. math

    The Russian mathmatician Pafnuti L. Chebychev pved a remarkable theorem called Chebybchev's Inequality: In any data set, if p is the fraction of the data that lies within k standard deviations to either side of the mean, then p is greater than or equal to

    asked by rachel on September 8, 2012
  99. Biology

    26. The relationship between population growth and resources can be described as a. inverse; as one goes up the other goes down b. parallel; when one goes up so does the other c. complex; there are many contributing factors d. equal; they both level off in

    asked by mysterychicken on February 14, 2010
  100. math

    Hi, I am trying to solve a problem using Chebyshev's Theorem. The problem says that: A large sample of Northern Pike caught at Taltson Lake (Canada) showed that the average length was x (mean)=32.5 inches with sample standard deviation s=8.6 inches. a.)

    asked by Stella on May 26, 2009