1. Chemistry

    I have to sort compounds into groups, separating them by if they are acidic, Ionic, or Covalent. Heres the list: Calcium Carbonate Sodium Hypochlorite Sodium Chloride Sodium Hydrogen Carbonate Acetic Acid Ammonium Hydroxide Silicon dioxide Magnesium
  2. Algebra

    Joyce combines 9 atoms of hydrogen and 3 atoms of nitrogen to make 3 molecules of ammonia. write a direct variation equation which relates atoms of hydrogen to atoms of nitrogen. How many nitrogen atoms does Joyce need to form ammonia molecules using 51
  3. biology

    A man with normal color vision marries a woman who is colorblind. What percentage of their sons would be colorblind, what percentage of their daughters would be colorblind, what percentage of their daughters would be carriers of the colorblind gene?
  4. Sociology (Stats) Std. Dev

    Given (μ) = 500, and σ = 100. What percentage of the SAT scores falls: A) Between 500 and 600? The percentage falls 1 σ above the (μ), 68.26% / 2 = 34.13% B) Between 400 and 600? The percentage falls 1 σ below and 1 σ above
  5. chemistry

    Magnesium can be produced by reaction of magnesium oxide (MgO) with silicon (Si). The by-product of the reaction is magnesium orthosilicate (Mg2SiO4). A reactor is charged with 183.0 kg of MgO and 116.0 kg Si. Assume the reaction goes to completion.
  6. Qualitative analysis ( Chemistry)

    A solution x forms a white precipitate with dilute sulfur in acid and also with aqueous silver nitrate. What could solution x contain? A) Barium Chloride B) Barium nitrate C) Magnesium chloride D) Magnesium chlorine Could someone tell me how to get the
  7. chemistry

    2) Suppose you have 5.00g of powdered magnesium metal, 1.00L of 2.00M potassium nitrate solution, and 1.00L of a 2.00M silver nitrate solution. a. Which one of the solutions will react with the magnesium powder?
  8. chemistry

    if I have the reaction Magnesium + Hydrochloric Acid -> Magnesium Chloride + Hydrogen Gas And I have to 'investigate the effect of the concentration of the acid on the volume of hydrogen gas produced in the above reaction', what would be expected to
  9. Organic Chemistry

    During the synthesis of a Grignard reagent in diethyl ether solvent, what is the identity of the bubbles that show up on the surface of the magnesium? -Gaseous magnesium byproducts -Gaseous O2 -Gaseous H2 -Gaseous diethyl ether
  10. chem101

    Hydrogen gas can be produced in the lab by the reaction of magnesium metal and hydrochloric acid. Mg + 2 HC -> MgCl2 + H2 How many grams of hydrogen gas will be produce if 5.00 g of magnesium metal is dissolved in excess acid.
  11. Chemistry

    energy required for ionisation of 0.02 gram atom of magnesium is x Kj .the amount of energy required to ionise 1 atom of magnesium is
  12. Ion charge & formulas of ionic compunds-DrBob222

    These are the other questions: I'll start from Number 1. 1. I have to write down the symbol for the following ions: a- sodium = Na b- chloride = CL c- sulfate = S d- ammonium = ? would it be NH4? e- chromium (II) = Cr f- chromium(III) = Cr 2. write the
  13. Chemistry

    How many grams of Calcium Nitride can be produced using the calcium contained in 100 ml of a 4 Molar beryllium solution?
  14. chemistry

    A molecule of sodium nitride would control how many sodium ions? Why?
  15. Chemistry

    How many (a) calcium ions and how many (b) nitride ions are there in 1.00 mol Ca3N2?
  16. chemistry

    Mg + O2 ------> MgO if 1.00 g of magnesium is ignited in a flask containing 0.500liters of oxygen at STP, how many grams of magnesium oxide areproduced? what is the name and the amount of the reactant inexcess? My work: 1g Mg/24.3g=0.041 mol Mg; 0.5L
  17. physics

    Calculate the mass of nitrogen present in a volume of 3000 cm^3 if the temperature of the gas is 22 degrees Celsius and the absolute pressure is 2.00 * 10^-13 atm, a partial vacuum easily obtained in laboratories. The molar mass of nitrogen (N2) is 28
  18. MINERALS

    can someone pls explain (n i mean explain) the effect of nitrate ion and magnesium ion deficiency on plant growth proteins....well they are used for repairing worn out cells and for producing new cells? chlorophyll....it'll be able to photosynthesise less
  19. Chemistry

    A sample of nitrogen gas is collected over water at a temperature of 23 degrees C. What is the pressure of the nitrogen gas if the atmospheric pressure is 795 mm HG? Anser in units of mm Hg.
  20. chemistry 30

    Catalytic converters in automobiles are used a. only to burn uncombusted gasoline b. only to convert carbon monoxide to carbon dioxide c. only to convert nitrogen oxides to nitrogen and oxygen d. all of the above
  21. question

    Which organisms are capable of converting gaseous nitrogen in the air into a form that other living organisms can use? nitrogen-fixing bacteria denitrifying bacteria decomposers producers***
  22. College Chemistry 3

    Find the empirical Formula of a compound that is 30.4% nitrogen by mass, and consists of only nitrogen and oxygen. What is its molecular formula if its molar mass is 92g/mol?
  23. biology (check answer)

    What is different about every nucleotide of a DNA molecule? a) the deoxyribose sugar b) the phosphate group c) the shape of the molecule d) the nitrogen bases it's the nitrogen bases, am i correct?
  24. Chemistry

    Ammonia is produced when Nitrogen gas reacts with Hydrogen gas, as shown by the equation below: N2 + 3H2 --> 2NH3 If the percentage yield is 90%, what would be your experimental yield of NH3 if 145.8g of N2 react? 2) 2Mg + O2 --> 2MgO A) If 50g of Mg
  25. Chemistry

    Ammonia is produced when Nitrogen gas reacts with Hydrogen gas, as shown by the equation below: N2 + 3H2 --> 2NH3 If the percentage yield is 90%, what would be your experimental yield of NH3 if 145.8g of N2 react? 2) 2Mg + O2 --> 2MgO A) If 50g of Mg
  26. Chemistry

    Part 1 : a.) How many grams of Hydrogen will be contained in a 100.000 g sample of magnesium hydroxide.? c.) How many grams of nitrogen will be contained in a 120.0 g sample of calcium cyanide? ________________________________________ Part 3: d.) How many
  27. Chemistry

    During the synthesis of a Grignard reagent in diethyl ether solvent, what is the identity of the bubbles that show up on the surface of the magnesium? -Gaseous magnesium byproducts -Gaseous O2 -Gaseous H2 -Gaseous diethyl ether
  28. chemistry

    The mole fraction of oxygen in air is 0.209. Assuming nitrogen is the only other constituent, what are the partial pressures (in torr) of oxygen and nitrogen when the barometer reads 780 torr?
  29. Chemistry

    25cm^3 of a gas containing only nitrogen and oxygen decomposed to form 25cm^3 of nitrogen and 50cm^3 of oxygen. All the volumes were measured at the same temperature and pressure. Write an equation for the reaction.
  30. Science: my answers

    Which organisms are capable of converting gaseous nitrogen in the air into a form that other living organisms can use? nitrogen-fixing bacteria denitrifying bacteria decomposers producers***
  31. chemistry

    350 calories of heat is added to a sample of nitrogen gas and the temperature is increased by 89 degrees Celsius. What is the mass of the nitrogen sample in cal/gram Celsius?
  32. math

    SHURGRO fertilizer contains 18% ammonia plus carbon compounds.If 80% of the ammonia contains the chemical element nitrogen, what percent of this fertilizer is nitrogen? a. 14.4% b. 18% c. 38% d. 40% e. 62% please answer and explain
  33. Chemistry

    A sample of nitrogen gas is collected over water at a temperature of 23°C. What is the pressure of the nitrogen gas if the atmospheric pressure is 791 mm Hg? Answer in units of mm Hg
  34. chemistry

    Which material would you expect to have a greater bandgap energy between indium nitride (InN) and indium phosphide (InP)?
  35. chemistry

    Which material would you expect to have a greater bandgap energy between indium nitride (InN) and indium phosphide (InP)?
  36. Science

    Which organisms are capable of converting gaseous nitrogen in the air into a form that other living organisms can use? nitrogen-fixing bacteria denitrifying bacteria decomposers producers Would the correct answer be A?
  37. statics

    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: Suggest you make a drawing and label first…Drawings need not
  38. Chemistry

    Dinitrogen tetroxide decomposes to nitrogen dioxide: N2O4 (g) ---> 2NO2 (g) Delta H rxn: 55.3 kJ At 298 K a reaction vessel initially containing .100 atm of N2O4. When equilibrium is reached, 58% of the N2O4 has decomposed to NO2. -What percentage of
  39. Chemistry

    Dinitrogen tetroxide decomposes to nitrogen dioxide: N2O4(g)→2NO2(g)ΔHorxn=55.3kJ At 298 K, a reaction vessel initially contains 0.100 atm of N2O4. When equilibrium is reached, 58% of the N2O4 has decomposed to NO2. What percentage of N2O4 decomposes at
  40. Science

    Alice and Marge are studying the properties of matter. The girls cut some silver-colored magnesium sheets into 3-inch long strips and then put one strip each into test tubes: one containing water and one containing acid. Nothing happened when they added
  41. chemistry HMWK help.......

    ammonia is produced by sythesizing nitrogen and hydrogen gas. if i have 2 mols of nitrogen gas and 5 mols of hydrogen gas, which reagent will run out first?? a) if i have 0.0345 mols of nitrogen gas and 0.0537 mols of hydrogen gas, which reagent will run
  42. Chemistry

    A sample of nitrogen is collected over water at 21 degrees Celsius at a pressure of 745 torr. What is the partial pressure, in torr, of the nitrogen?
  43. Chemistry

    The solubility of nitrogen in water is 6.9 x 10^-4 at exactly 1 atm pressure. What is the solubility of nitrogen under .80 atmp pressure? I don't know where to start with this problem, what formula do I use?
  44. statistics

    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: Suggest you make a drawing and label first… a. Percentage of
  45. statistics

    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: Suggest you make a drawing and label first… a. Percentage of
  46. stats

    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: Suggest you make a drawing and label first… a. Percentage of
  47. chemistry

    Ammonia decomposes upon heating to produce nitrogen and hydrogen elemental products. Write a balanced equation and then use stoichiometry problem solving to determin the mass of nitrogen product that can form if exactly 25.50 grams of ammonia(NH3) is fully
  48. ap chemistry

    Ammonia decompose upon intense heating to produce nitrogen and hydrogen elemental products. Write a balanced equation and then use stoichiometry problem solving to determin the mass of nitrogen product that can form if exactly 25.50g of ammonia is fully
  49. statistics/Help Please!!

    In a sample of seven cars, each car was tested for nitrogen-oxide emissions (in grams per mile) and the following results were obtained:0.18, 0.12, 0.05, 0.19, 0.18,0.13, 0.15. Assuming that this sample is representative of the cars in use, construct a 98%
  50. Science

    In Kjeldhal's method, Conc. H2SO4,NaOH & Boric acid is used to measure the % of nitrogen in a sample. If , in a sample HgCl2 is added , will it interfere the reaction? Accurate conc. of nitrogen will be determined or not?
  51. Chemistry

    An antacid contains 200mg of aluminum hydroxide and 200 mg of magnesium hydroxide per capsule. How many moles of aluminum hydroxide does each capsule contain? What is the mass in milligrams of 0.0734 mole of magnesium hydroxide?
  52. chemistry

    Gallium nitride (GaN) is a semiconductor with a bandgap Eg=3.2 eV. Calculate the absorption edge of GaN. Express your answer in units of m.
  53. chemistry

    Gallium nitride (GaN) is a semiconductor with a bandgap Eg=3.2 eV. Calculate the absorption edge of GaN. Express your answer in units of m.
  54. Math

    In an interbarangay basketball league the team from barangay Culiat has won 12 out of 25 games a winning percentage of 48% .We have seen that they need to win 8 games consecutively to raise their percentage to at least 60%. What will be their winning
  55. math

    In an interbarangay basketball league the team from barangay Culiat has won 12 out of 25 games a winning percentage of 48% .We have seen that they need to win 8 games consecutively to raise their percentage to at least 60%. What will be their winning
  56. Statistics

    4. The Graduate Record Exam (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: (a) draw a rough sketch,
  57. Statistics

    4. The Graduate Record Exam (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: (a) draw a rough sketch,
  58. statistics

    4. The Graduate Record Exam (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: (a) draw a rough sketch,
  59. Chem

    Volume of nitrogen gas is 125ml atmospheric pressure is 763mm Hg the water temperature inside the eudiometer is the same as the level of the water in the beaker. Calculate the volume if the nitrogen at STP. P1V1/T1=P2V2/T2
  60. Chemistry

    When 34.5 L ammonia and 39.5 L oxygen gas at STP burn, nitrogen monoxide and water are produced. After the products return to STP, how many grams of nitrogen monoxide are present? 4NH3+5O2->4NO+6H2O
  61. Physics

    A gas cylinder has a volume on 200l, and contains Nitrogen at a pressure of 200kPa and a temperature of 290 degrees Kelvin. The molar mass of Nitrogen is 14.0067g. Calculate. The number of moles in the gas cylinder?
  62. Chemistry

    What is the empirical of compound (X) going through the following decomposition reaction? X = sulfur + oxygen + nitrogen sulfur = 21 gr oxygen = 69.70gr nitrogen = 6.10gr
  63. biology

    escribe the biochemical process of biological fixation of nitrogen. write the general equation of biological nitrogen fixation.
  64. Physics

    In ammonia, 14g of nitrogen combines completely with 3g of hydrogen. How many grams of hydrogen are needed to combined completely with 56 g of nitrogen? Need Help
  65. Chemistry

    1. How many moles of ammonia NH3 are produced when 0.45 moles of nitrogen N2 reacts? N2 + 3H2 yields 2NH3 2. How many mililiters of water will be produced when 2.05 g of hydrogen reacts? The density of water is 1.00 g/mL ? 2H2 + O2 yields 2H2O 3. What is
  66. Math

    A clothing retailer purchased a line of fall leather coats which were priced to sell at $600 each. This price reflected a markup of 45% on the selling price. At the end of the season the retailer had three coats left, which were marked down to 25% and
  67. Chemistry

    Pharmacists sell tablets containing magnesium hydroxide, Mg(OH)2, to combat indigestion. A student carried out an investigation to find the percentage by mass of Mg(OH)2 in an indigestion tablet. The student reacted the tablet with dilute hydrochloric
  68. science

    what will be the law of conversion of a) 65 grams 70 grams b) magnesium + oxygen = magnesium oxide 45 grams ? grams 80 grams c) sodium hydroxide + hydrochoride acid 40 grams 36.5 grams sodium chloride + water ? grams 18 grams
  69. Chemistry

    A sample of nitrogen gas was collected via water displacement. Since the nitrogen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 21 °C is 1.16 atm, what is the partial pressure of
  70. Chemistry

    A sample of nitrogen gas was collected via water displacement. Since the nitrogen was collected via water displacement, the sample is saturated with water vapor. If the total pressure of the mixture at 21 °C is 1.16 atm, what is the partial pressure of
  71. General Chem

    Nitrogen oxide reacts with oxygen gas to form nitrogen dioxide (NO2). In one experiment 0.866 mole of NO is mixed with 0.503 mole of O2. Calculate the number of moles of NO2 produced
  72. chem

    how do u calulate percentage composition of NO2 [mass N/mass NO2] x 100 = %Nitrogen [mass O2/mass NO2] x 100 =%oxygen
  73. Naming Ionic Compounds

    Can you please have a look at my questions. Thank you very much in return:-) 1. Will 2 metals develop an ionic compound? Clarify. I don't think they will, but I don't know how to explain. I only know that in order to form ionic compounds, the total number
  74. chemistry

    How many moles of magnesium is 1.25 x 1023 atoms of magnesium? A. 0.208 × 101 mol Mg B. 2.08 × 101 mol Mg C. 2.08 × 10 -1 mol Mg D. 20.8 mol Mg I think it would be D
  75. chemistry

    What is the formula equation and balance it and also give the sum coefficient of: 1.sulfur dioxide(g)+oxygen(g)delta arrow (sorry i can't draw it here) sulfur trioxide 2. nitrogen dioxide(g)+dihydrogen monoxygen(l)- nitric acid(g)+nitrogen monoxide
  76. chemistry

    Which of the following statements is true regarding the Lewis structure for methylamine, CH3NH2? a) There will be an unshared pair of electrons on the nitrogen atom. b) There will be three covalent bonds to the carbon. c) Nitrogen will form a double bond
  77. Chemistry

    I've run into some difficulty with my chemistry homework. We went over this practise question in class today as an example. However, I wasn't able to fully grasp how to work it out. "How many grams of nitrogen form when 34.6 grams of nitrogen dioxide
  78. chemistry

    A 0.12-mole sample of nitrogen gas occupies a volume of 2.55 L. What is the volume of 0.32 mol of nitrogen gas under the same conditions?
  79. Computer Science/Excel

    Here's the problem: John believes that the average American will be in debt forever. He decides to create a table that demonstrates this. He thinks that given 60 months (5 years) to get out of debt and the annual percentage rates 1-5 and 7-15 the
  80. 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
  81. Chemistry

    An antacid contains 200mg of aluminum hydroxide and 200mg of magnesium hydroxide per capsule. a. How many moles of Al(OH)3 does each capsule contain? 2.56 x 10^-3 mol Al(OH)3 is that correct? b. What is the mass in milligrams of 0.0457 mole of magnesium
  82. Chemistry

    10.0 grams of magnesium reacted with fluorine to produce MgF2 Find balance equation: 2MgF2=2MgF 1)can someone explain to me how many grams of fluorine reacted with magnesium. 2)How many grams of MgF2 were formed in the reaction?
  83. chemistry

    If a gas is made up of 3 parts hydrogen and 2 parts nitrogen...how much percentage of hydrogen is the gas made up of? The answer says 60%, but I don't understand how the came up with the answer
  84. Math

    Land growing continuous grain corn as a cash crop loses soil at a rate of 14.0 metric tonnes ha-1 yr-1. This is a fertile soil, which has an organic matter content of 3.8% and nitrogen content of 0.35% (both by mass). a) Calculate how long it will take to
  85. Chemistry

    Please show me the steps..... At STP, 3.00 L of nitrogen gas contains the same number of molecules as A) 1.00 L of nitrogen gas B) 2.00 L of oxygen gas C) 3.00 L of chlorine gas D) 4.00 L of hydrogen gas
  86. science

    A piston pump containing 2 liters of nitrogen gas at 3000 psia (absolute) pressure empties its entire contents into a 10 liter pressure container. Before the transfer of gas the 10 liter container already contained nitrogen gas at 100 psia (absolute)
  87. Chemistry

    1. Nitrogen monoxide is oxidized in air to give brown nitrogen dioxide. Starting with 2.2mol NO, how many moles and how many grams of 02 are required for complete reaction? What mass of NO2,in grams, is produced? Please show the solution step by step.
  88. Chemistry

    A 0.250-g sample of a magnesium-aluminum alloy dissolves completely in an excess of HCl (aq) . When the liberated H2 (g) is collected over water at 29 degrees celsius and 752 torr, the volume is found to be 301 mL . The vapor pressure of water at 29
  89. Marketing Math - markup/mark down

    A clothing retailer purchased a line of fall leather coats which were priced to sell at $600 each. This price reflected a markup of 45% on the selling price. At the end of the season the retailer had three coats left, which were marked down 25% and sold.
  90. SCIENCE/MATH

    Land growing continuous grain corn as a cash crop loses soil at a rate of 14.0 metric tonnes ha-1 yr-1. This is a fertile soil, which has an organic matter content of 3.8% and nitrogen content of 0.35% (both by mass). a)Calculate how long it will take to
  91. Chemistry

    Iron and manesiu are two common elements found in numerous compounds. magnesium is always in the +2 oxidation state while iron exhibits oxidation states of +2, +3,+4,and +6. why would magnesium not be found in the these upper oxidation states.
  92. Environmental Science

    Explain how the nitrogen used for making proteins in a lion's body traveled from the atmosphere to the lion. How will it be returned to the atmosphere after the lion dies? Google Nitrogen cycle animal
  93. Biology

    Need help with these: 33. In addition to causing disease, protests also affect humans through a. their role in the nitrogen cycle b. their antibiotic properties c. their ability to clean up oil spills d. all of the above A? 35. Fungi obtain food by a.
  94. math percentage diff

    a value of 2.40 increased to 4.48 in 5 years. what is the change in percentage each year? this one was difficult to figure out..
  95. math

    about what percentage of the population believe saying F to ber true? = what percentage of 250148571.0 = 136,800,000?
  96. chemistry

    Write a balanced chemical equation for the reaction of solid magnesium with aqueous iron(II) chloride to form aqueous magnesium chloride and solid iron. (Type your answer using the format CO2 for CO2. Use the lowest possible coefficients.)
  97. statistics

    The Graduate Record Exam (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. What percentage score above 1300? What percentage score above 800?
  98. CHEMISTRY

    Silver reacts with nitric acid to form nitrogen monoxide, silver nitrate and water. Calculate the volume of nitrogen monoxide gas (@STP) that can be produced from the reaction of 5.00g of silver?
  99. Math

    The amount of nitrogen dioxide A in parts per million (ppm) that was present in the air in the city of Homer on a certain day in June is modeled by the function A(t) = -2t^2 + 32t + 12, where t is the number of hours after 6:00 A.M. Use this function to
  100. 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,