1. chemistry

    what is a complete and incomplete combustion reaction ??
  2. Psy 210

    The following table describes five situations in which a person reacts to stress in an unhealthy manner. For each: a. identify the stressor(s). b. briefly explain why the person's reaction is an unhealthy choice. c. briefly describe one healthy alternative
  3. chemistry - PLEASE HELP

    Spectroscopic studies have shown that the fusion reaction in the sun's core proceeds by a complicated mechanism. One proposed overall equation for the solar fusion reaction is 411H+2 0−1e→42He which is also accompanied by the release of "massless"
  4. chemistry

    There are four main methods of making salts: Acid + Metal, Acid + insoluble base, Acid + alkali and solution of salt A + solution of salt B. a. a student wanted to make some sodium sulfate. i. which method would be best to use? ii. why? iii. which
  5. Chemistry

    im not quite sure what to do with this problem... the info I have: -balanced equation= (CuCl2*2H20)=>CuCl2+2H2O -initial mass of copper compound: 0.94g Q: use stiochiometry to find the theoretical yield for the mass of copper (II) chloride we also used
  6. bio

    An organism is composed of two layers of cells. A student is observing one of the layers with a compound microscope under high power. To observe the second layer of cells, the student should 1 rotate the nosepiece 2 adjust the mirror 3 turn the fine
  7. Physics

    A bar of aluminum (bar A) is in thermal contact with a bar of iron (bar B) of the same length and area. One end of the compound bar is maintained at Th = 75.5°C while the opposite end is at 30.0°C. Find the temperature at the junction when the energy
  8. Enthalpy Change Calculations

    Find the heat of reaction (ΔH) for each of the following chemical reactions and note whether each reaction is exothermic or endothermic. 1. H2O(l) -> H2O(g) This is what I have so far: H2(g) + ½ O2(g) -> H2O(l) ΔH = -286.0 kJ/mol H2(g) + ½ O2(g) ->
  9. 5th grade Language Arts

    Thanks Ms. Sue! I have other sentences I would like to try to get right. 1. Mr. Morton, the best reading teacher in the world, taught me sentence structure. Complex: Mr. Morton taught me sentence structure = indep & best reading teacher in the world = dep
  10. chemistry

    Using data in table below and S °(CaSO4·H2O(s))= 194.0 J·mol-1·K-1, calculate ÄfS° for CaSO4·H2O(s) in J·mol-1·K-1. Compound S °, J·mol-1·K-1 C(s) 5.69 H2(g) 130.6 N2(g) 191.5 O2(g) 205.0 Na(s) 51.0 Cl2(g) 223.0 Ca(s) 154.8 S(s) 31.8 Anyone
  11. Chemistry

    If you put a piece of iron in an aqueous solution of blue Cu2+ ions the spontaneous redox reaction Fe+ Cu2+„³ Fe2+ Cu Will occur. An aqueous solution of Fe2+ ions is red-brown a. What is oxidized b. What is reduced c. What is the oxidizing agent d. What
  12. Chemistry(Please check)

    1) Where in the phase diagram of a compound do all phases exist together? a) at the sublimation point b) at the boiling point c) at the melting point d) at the critical point e) at the triple point I chose answer E, the triple point. Is this correct?
  13. Chemistry

    Show the steps necessary to transform acid on left to compound on right... Make sure you use SOCl3.................. (CH3)3CCH2C(=O)OH ----------> (CH3)3CCH2C(=O)OCH2CH=CH2 (CH3)3CCH2C(=O)OH-----------> (CH3)3CHC(=O)N(CH2CH3)2
  14. Chemistry

    1. Write the correct formulas for the following: A. A compound composed of melt X which has a +2 charge and nonment Y which has a -3 charge (write it as “XY” including the correct subscripts as necessary.) My answer: by adding or taking away a charge
  15. algebra 2

    Boiling Lake is a small lake on the island of Dominica. The water temperature of the lake is between 180*F and 197*F. Write a compound inequality for this temperature range. [Graph the inequality.]
  16. 9th grade SCIENCE

    I have to list 5 different organic compounds; list different types for each; name; structure; properties; and uses. I am a bit confused as to what an organic compound actually is. I know it must contain a carbon, but would vegetables or household foods be
  17. Chemistry-Dr.Bob222

    Consider the compounds with the generic formula listed and their corresponding molar solubilities in pure water. Which compound has the smallest value of Ksp? a. AC; molar solubility = 1.35 x 10^-4 M b. AX2; molar solubility = 2.25 x 10^-4 M c. A2X; molar
  18. Physics

    A compound microscope has a barrel whose length is 17.4 cm and an eyepiece whose focal length is 1.7 cm. The viewer has a near point located 25 cm from his eyes. What focal length must the objective have so the angular magnification of the microscope is
  19. health

    How dose lock-and-key mechanism relate to hormones? A. If a hormone fits the receptor site, then there is no reaction. If a hormone and a receptor site do not match, then there will be an effect. B. If a hormone fits the receptor site, then there will be
  20. science

    Examine the situation. Lloyd is studying the effect of breakfast cereal on the health of rats. He suspects that the cereal may be unhealthy. He feeds rats various amounts of breakfast cereal over a six-week period. He weighs the rats using a digital lab
  21. math

    how much money would have to be invested in an account at 3.98% annual interset to achieve a balance of 25,000 in 17 years if a. The account pays simple interest b. the account compound interest qrtly c. the account compounds interest continuously
  22. Chemistry

    The experimentally determined rate law for the reaction H2 + NO --> ½N2 + H2O is Rate = k[H2][NO]2. Is the mechanism below possible? Step 1: H2 + NO --> N + H2O Slow Step 2: N + NO -->N2 + O Fast Step 3: O + H2 --> H2O Fast 1. Yes, because the slow step
  23. Chemistry

    4, Assign oxidation states for the two elements in the compound OF2. Explain the rules that you use. 5. For each of the following oxidation-reduction reactions of metals and nonmetals, identify the element that is oxidized and the element that is being
  24. Science

    which of the following statements incorrectly describes a tool used by scientists? A. A compound light microscope enables a scientist to view objects too unaided eye to see. (B).A beaker is a type of glassware a scientist uses in the lab to record data. C.
  25. Chemistry

    A 1.42-g sample of a pure compound, with formula M2SO4, was dissolved in water and treated with an excess of aqueous calcium chloride, resulting in the precipitation of all the sulphate ions as calcium sulphate. The precipitate was collected, dried, and
  26. Chemistry(the)

    An optically active compound having molecular formula C6H12O6 is found in two isomeric forms (A) and (B) in nature. When (A) and (B) are dissolved in water they show the following equilibrium. (A) Equilibrium mixture (B) D = 1110 52.20 19.20 (i) What are
  27. chemistry(just need to clarify, no need to solve)

    When a sample of NO2(g) (5.641 mol) is placed in 360.0 L reaction vessel at 716.0 K and allowed to come to equilibrium the mixture contains 3.412 mol of NO(g). What is the equilibrium concentration (mol/L) of NO(g)? When a sample of PCl5(g) (1228 grams) is
  28. Physics

    A compound microscope has an objective lens with a focal length of 1.5 cm and an eye piece of focal length 5 cm. It is focused on an object which is at a distance of 1.8 cm. The length of the microscope for normal adjustment is ?
  29. math

    lithium citrate comes in 300 mg/5ml. the doctor calls and asks you to compound lithium citrate ''light'' (75mg/5ml). How would you dilute the citrate to proper dose?
  30. Chemistry 101

    A chemist needs 2.00 grams of a liquid compound with a density of 0.785 g/cm^3 density. what volume of compund is required? Mass= Volume X Density 2.00g x 0.785 g/Cm^3 = 1.57g/cm^3 Not sure is this is correct......
  31. chemistry

    An indicator has the reaction Hln(aq) ↔ H+(aq) + In-(aq). Explain how the indicator can change color when a strong base is poured into a solution of this indicator. Will a strong base dissociate? Which way will this cause the reaction to shift? Is there
  32. chemistry

    An indicator has the reaction Hln(aq) ¡ê H+(aq) + In-(aq). Explain how the indicator can change color when a strong base is poured into a solution of this indicator. Will a strong base dissociate? Which way will this cause the reaction to shift? Is there
  33. chemistry

    I need help. I have no clue how to find this. A flask is charged with 1.680 atm of N2O4(g) and 1.220 atm of NO2(g) at 25 degrees celcius. The equilibrium reaction is N2O4 2 NO2 After equilibrium is reached, the partial pressure of NO2 is 0.550 (a) What is
  34. Chemistry URGENT/DR BOB

    Can someone may sure that I balanced the following groups of equations correctly. Write an equation to show how acetic acid reacts with water to produce ions in solution. C2H4O2 + H2O >>>>>>> H3O + C2H3O Write an equation for the neutralization of HCl and
  35. Chemistry

    I did a melting point test for menthol and the question is asking what type of compound is demonstrated and the answer should include inter molecular forces I also need to explain this same question for a solubility in water test and solubility in oil test
  36. Chemistry

    If we wish to find the molar mass of a pure solid organic compound, which measurement would be most useful and why? A)melting point of the solid B)melting point depression of the mixture of the solid with 1,4-dichlorobenzene C)Heat of combustion
  37. E.L.A. PLEASE CHECK!

    Which choice best describes the underlined word or words in each sentence? For several decades, satellites around the earth have broadcast signals and monitored weather. Underlined is: satellites A- complete subject B- simple subject C- compound subject D-
  38. Language Arts

    I just need someone to double check my work. :) Here are my answers: 1. C 2. B 3. A 4. B 5. D 6. B 7. A 8. A Here are the questions: Choose the option that correctly identifies the ( underlined words ) in each sentence. 1. (Stretching for 210 miles), the
  39. chemistry

    1)What is the correct structure of AsH3???? 2)Name the type of hybrid orbitals of central form. 3) Name the molecular geometry of compound. 4)State weather it is polar or non polar. 5) Estimate H-As-h bond angle in degree. 6) what is the dominant form of
  40. Chem---DrBob222

    -----Chromatograph----- Carrying out TLC on colorless compounds. Give two examples of methods to use in order to visualize the spots on the plates. Carrying out TLC with a mixture of two compounds A and B. A is less polar than B. on a reverse phase plate
  41. Chemistry

    Solutions are made that contain 0.1 moles of each of the following compounds below in 100 g of H2O. Choose the compound whose solution will have the lowest freezing point. NaBr MgCl2---- KClO3 CO2 MgSO4 I know the answer is MgCl2 but I don't know how to
  42. Chemistry Urgent Help

    if 4.55 g of sodium sulphide and 15.0 g of bismuth nitrate are dissolved in separate beakers of water which are then poured togehter, what is the maximum mass of bismuth sulphide an insoulble compound that could precipitate? Which reactant was the
  43. Science 7R

    contains all the same kind of cell???? what part of a cell is that or something? AIDS???? parts of a animal or plant cells (im not going to list them all because you guys already know) ???? electron microscope ???? tiisue ???? vaccine ???? virus ??? host
  44. math

    You are shopping for single-use cameras to hand out at a party. The daylight cameras cost $2.75 and the flash cameras cost $4.25. you must buy exactly 20 cameras and you want to spend between $65 and $75, inclusive. Write and solve a compound inequality
  45. Chemistry

    Find the enthalpy of combustion of magnesium using Hess' law given the following data (assume that exactly 100.0 mL of HCl was used in each trial and that HCl is in excess) Magnesium/HCl reaction: Grams of Mg= 0.244g Initial temp= 32.2 degrees celsius
  46. Science

    are mixtures heterogeneous or homogenous? are compounds heterogeneous or homogenous? which one is both heterogeneous and homogenous? Can a mixture be separated physically or chemically? What about a compound? please help
  47. Chemistry

    A molecule has a glycerol backbone. The branches off of the three carbons are as follows: o-co-(ch2)14 - ch3 o-co-(ch2)12 - ch3 o-co-(ch2)16 - ch3 What is this compound called?
  48. English

    Which of the following is a compound subject? cats and dogs twenty-two miles cats or dogs each girl or boy my answer cats and dogs
  49. Math

    A lends altogether Rs 6000 to B and C for two years.B pays Simple Interest @ 10%p.a. and C pays Compound Interest @8 %.If C pays Rs 50 more than B as the interest , how much did A lend to each of them?
  50. Chemistry

    Consider the following reaction: 2 SO2 (g) + O2 (g)----> 2 SO3 (g) If 285.3 mL of SO2 is allowed to react with 158.9 mL of O2 (both measured at 315 K and 50.0 mmHg), what is the limiting reactant and theoretical yield of SO3 in moles? If 187.2 mL of SO3 is
  51. Ap chem question 2 related to the first question

    Calculate the volume of gas you would expect to be evolved in X mol of magnesium were reacted with an excess of HCl at standard conditions. I'm going to tell you what my father told me...LOOK IT UP thanks for the unnecessary comment! Mg + 2HCl ==> MgCl2 +
  52. Chemistry 101

    Can someone pleas help I have this assignment and the only question I cannot figure out is to describe the hybridization of all the covalent bonds in oxalic acid? and label those bonds as sigma or pi bonds? I have determine that oxilic acid formula is
  53. English

    Are theses sentences simple or compound sentences? Alex's younger brother, Cameron, and two other friends also became interested in the benefit. I think simple because it is just one independent clause. They would charge people for a dinner and hold the
  54. Physical Science

    Suppose an unknown substance has a melting temperature of 1,200 degrees Celsius and a density of 16.7 g/cm3. However, the different individual atoms that make up the substance have very different melting temperatures and densities. The unknown substance is
  55. Maths

    The formula for a simple interest rate is I = PRT and Total Balance = P + I The formula for compound interest is B = P × (1 + 〖r/n)〗^nt Adam invests £55,000 at interest rate of 4% per annum
  56. Science

    A solution in a dish contains 3.0 grams of salt dissolved in 100 grams of water. If 50 grams of the water evaporates, the solution is A compound A mixture An element A Solid
  57. physical science

    can two or more elements be combined chemically to make a new element? Explain. My answer: No, it becomes a compound which is a substance combined of two or more elements chemically combined not sure if correct - I am doing the review and not sure of a few
  58. O.Chem

    Only a substitution product is obtained when the compound 1-bromo-2,6-dimethylcyclohexane is treated with sodium methoxide. Draw the substitution product and explain why an elimination product is not obtained.
  59. CHEMISTRY

    A STUDENT STUDYING THE FE+3- HSCN equilibrium put into a test tube 10.00ml of 2.00 x 10-3 M Fe(NO3)3 with 10.0 mL of 2.00 x 10-3 M HSCN.THE H+ in the resulting solution was manteined at 0.500.By spectrophotometric analysis of the equilibrium solution, the
  60. Driver's Ed

    1. The natural laws include the law of (1 point) speed limits. gravity*** railroad crossings. yielding. 2. Which of the following should determine whether you need to speed up or slow down? (1 point) how quickly you need to get somewhere how far above the
  61. science

    An intermediate reaction used in the production of nitrogen containing fertilizers is that b/w NH3 and O2 4NH3(g) + 5O2(g)--> 4NO(g) + 6H2O(g) A 150.0-L reaction chamber is charged with reactants to the following partial pressures at 500 degrees C: P(sub
  62. biology

    when robert hooke observed cork through his compound microscope , all that he could see were empty chambers. why were hooke's chambers empty
  63. Chemistry(Please check answers)

    1) For a reaction delta Go is more negative than delta Ho. What does this mean? a. delta So is zero. b. delta So is negative c. delta So is positive d. delta So is negative if delta Ho is positive. e. delta So is negative if delta Ho is negative. I think
  64. Chemistry

    A XX-g sample of methane, CH4, is mixed with YY atm of O2 (an excess) in a VV L combustion chamber at 125.0°C. The combustion reaction to CO2 and H2O is initiated and the vessel is cooled back to 125.0°C. What is the final pressure in the combustion
  65. physics

    4 kg block rests on a smooth horizontal surface,upper surface of 4 kg is rough.A block of mass 2 kg is placed on its upper surface.The acceleration of upper block with respect to earth when 4 kg mass is pulled by a horizontal force of 30N?coefficient of
  66. Art

    An Asian sculptor creates an image of the Buddha for the local temple. The artist’s primary responsibility is to A. self: as long as he does his best, that’s all that matters. B. Buddha: he must work hard to please this revered leader. C. future
  67. chemistry

    how do you tell whether or not a compound is polar or non-polar?
  68. chemistry

    how do you tell whether or not a compound is polar or non-polar?
  69. chemistry

    how do you tell whether or not a compound is polar or non-polar?
  70. chemistry

    I am trying to calculate the how amount of Tris-bicarbonate should be added in the reaction. I would like to have final volume of bicarbonate 10mM in 2ml reaction. I made Tris-base (1M, 100ml) and instead of HCl, CO2 was bubbling to set pH7.5. 0.1L*0.1M=
  71. Science

    help fastwhich of the following statements incorrectly describes a tool used by scientists? A. A compound light microscope enables a scientist to view objects too unaided eye to see. (B).A beaker is a type of glassware a scientist uses in the lab to record
  72. chemistry

    2. A 500 mL saturated silver carbonate solution at 5¢XC is treated with hydrochloric acid to decompose the compound. Ag2CO3(aq) + 2HCl(aq) ¡÷ 2AgCl(s) + CO2(g) + H2O(l) The carbon dioxide generated is collected in a 19 mL vial and exerts a pressure of
  73. vocabulary

    Proofread find two missing commas in compound sentences. Let's say it is ten o’clock in the morning. Your room is a mess! Your clothes are on the floor and games are everywhere. It won’t take long to clean but you can’t do it. There isn’t anything
  74. Chemistry

    Dr Bob Can you please confirm for me that only NH3 has a boiling point that does not fit the general trend from these choices NH3 PH3 SbH3 AsH3 many thanks andy I am picking NH3 because of the reason that the larger the compound the greater the boiling
  75. Chemistry

    How come the charges of H*2O*2 (asterisk means subscript), which is hydrogen peroxide,don't equal? The charge of hydrogen is 2, and the charge of O is 4. For an ionic compound you can figure out the formula by the charges(when the charges of the ions add
  76. Chemistry

    A pure white solid material that looks like table salt releases gas when heated under certain conditions. There is no change in the appearance of the solid, but the reactivity of the material changes. Did a chemical or physical change occur? How do you
  77. sds chemisry

    diffren between endotermic reactin and exotermic reaction
  78. Chemistry

    Chemical reaction for converting polythene to ethanol
  79. Chemistry

    Is Cl2 + 2e- -> 2Cl- an oxidation half-reaction?
  80. General chemistry i

    Is this a redox reaction? 4Cr+3O2 -> 2Cr2O3
  81. Science

    Why is photosynthesis an example of a chemical reaction, and why is it classified as endothermic?
  82. chemistry

    What is the net ionic equation for the reaction of AgNO3 with Ba(OH)2?
  83. chemistry

    How do you balance a chemical reaction word equation?!
  84. Chemistry

    Calculate G° for each reaction using G°f values. MnO2(s) + 2 CO(g) Mn(s) + 2 CO2(g)
  85. chemistry

    questions related to yield of chemical reaction.
  86. Chemistry

    Write a balanced equation for each reaction Al + Cl2 -->
  87. 12th grade

    5 factors that affect the rate of a chemical reaction
  88. Chemistry

    What is the ionic equation for hydrolysis reaction of NH4C2H2O2 ? Thanks.
  89. Chemistry

    Is this reaction exothermic or endothermic? Fe(NO3)3+ NaSCN
  90. Science Question Help!!

    Why is photosynthesis an example of a chemical reaction, and why is it classified as endothermic. Can someone help me with this please!!
  91. chemistry

    What is the net ionic equation for the reaction of H2SO3 with Ba(OH)2?
  92. weber state university

    CH2=CH-CH2CH3+H2O What is the product of the reaction above
  93. Chemistry

    A certain first-order reaction has a rate constant of 2.60×10−2 s-1 at 18 C. What is the value of k at 55 C if Ea = 90.0 kj/mol?
  94. chemistry

    what is the equation of the reaction between potassium sulphite and bromine
  95. CHEM

    Calculate G° for each reaction using G°f values. MnO2(s) + 2 CO(g) Mn(s) + 2 CO2(g)
  96. chemistry

    If you have 64.3 g NH3, how many grams of F2 are required for complete reaction?
  97. Science

    How are these related? reractant, product, and chemical reaction
  98. physics

    reaction of lead nitrate with sodium iodide
  99. Chemistry

    What are the major organic products of this reaction: CH3CH2CH2COCH2CH3
  100. Chemistry

    Is Cl2 + 2e- -> 2Cl- an oxidation half-reaction?