1. Chemistry

    What are the five(5) indications that show that a reaction has taken place? Thanks
  2. Chemistry/Science

    Can a reaction order be negative?
  3. Chemistry 10

    reaction of AgNO3 with BaO... Would it be Ag^+ + O^---> AgO (s)
  4. Bio

    Does Aspirin do something to the reaction of amylase with starch ?
  5. science

    What are the factors that influence the rate of reaction??
  6. Chemistry..

    Reaction type that is being represented? S D SR DR C C3H6 + O2 --> ?
  7. Science--Chemistry

    How do you solve the reaction: Li + Mg2+ = ?
  8. life science

    What does Glycolysis reaction need to proceed?
  9. chemistry

    If the reaction is zero order, how long would it take for I2 disappear?
  10. 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 for this situation. ...
  11. 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 found to weigh 1.36 g. ...
  12. 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 such isomers called? (...
  13. 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 reduced. a) 4Fe(s) + 3O2...
  14. 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. A scale is used to ...
  15. 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 auction at the dinner. ...
  16. 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 NH3)= 1.3 atm, P(...
  17. 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 get it. I know I have ...
  18. 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 cell ???? organ ???? ...
  19. 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 secondary bonding for ...
  20. Chem 2

    You are instructed to create 600. mL of a 0.56 M phosphate buffer with a pH of 7.6. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) H3PO4(s) + H2O(l) equilibrium reaction arrow ...
  21. 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= 0.01 moles of Tris...
  22. college chem

    You are instructed to create 400. mL of a 0.40 M phosphate buffer with a pH of 6.9. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) H3PO4(s) + H2O(l) equilibrium reaction arrow ...
  23. 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 Thames is in England. ...
  24. psychology

    Psychologists are interested in people's behavior and their mental processes. Psychologists believe that: behavior is impacted by environment, but not by a person's physical state. behavior is affected by a person's mental and physical state, but rarely by his or her ...
  25. Chemistry

    42. Tell the function of the moderator and control rods in a nuclear reactor. I found this answer on google..is it correct? The function of the moderator is to slow down the neutrons produced by fission to greatly increase the probably that they will go on to create even more ...
  26. CHemistry

    Is the charge of nitrogen in N2O +1? If you are talking about the oxidation state of N in N2O, yes, it is +1. Charge, to me, implies that N2O is an ionic compound and it is covalent, not ionic.
  27. chemistry

    Hydrogen gas can produced by the reaction between metallic aluminum and aqueous hydrochloric acid 2Al+6HCl----2AlCl3+3H2 Hydrogen gas produced by this reaction is typically collected via water displacement, during which time the hydrogen gas becomes saturated with water vapor...
  28. 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 tourists: he must make sure...
  29. 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 most likely a ...
  30. 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 HO_2CCO_2H and its ...
  31. 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 point Am I right with my...
  32. 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 up to zero) but does ...
  33. 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 know? Was the original ...
  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. chem

    Zn^2+(aq) + 2OH^-(aq) ----> Zn(OH)2(s) a) how the addition of HCl affects the equilibrium? my answer is it will shift to the right b) how the addition of a small amount of NaOh affects the equilibrium?my answer is it will shift to the left c) how the addition of a large ...
  36. Reading

    Choose the option that correctly identifies the words in () in each sentence. 5. (Stretching for 210 miles) , the Thames is in England. (1 point) prepositional phrase gerund phrase participial phrase appositive phrase 6. (Eating flesh with razor-sharp teeth) is how piranhas ...
  37. Math Compound Interest

    If $500 is invested at an interest rate of 4.5% per year, find the amount of the investment at the end of 11 years for the following compounding methods. (Round your answers to the nearest cent.) Find a, Anually Find b, SemiAnually Find c, Quarterly Find d, Continuosly
  38. Chemistry

    Which of the following reactions is exothermic? 1. Na(s) --> Na(g) 2. Na(g) --> Na+ + e- 3. Cl2(g) --> 2Cl(g) 4. Cl(g) + e- --> Cl-1 My guess is 4, but I'm not sure Here is what you do. For 1, do we think it will take energy to change Na as a solid to Na as a gas. ...
  39. physics

    a bimetallic compound strip of brass and iron is 10cm long at 20C. When heated over a Bunsen burner flame the temperature of the brass rises to 800C and the iron to 750C. Calculate the difference in lengths of the iron and brass. (Ignore the bending effect)...please help
  40. Chemistry

    Hi! So, I thought I was very comfortable with distinguishing among Arrhenius, Bronsted-Lowry, and Lewis acids and bases. But then, I answered this question wrong and am looking for help because I'm not sure if my "second choice" answer is correct. The question asks: In the gas...
  41. chemistry

    Hey...how r u guys..thanks for helping me on my previous questions...can u help me solve two questions and check one? Thanks, all the questions are related to the info given: In some industrial processes, sodium chromate is added to water coolants. When the coolant is drained...
  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 limitting reactant? Na2S + Bi...
  43. chemistry

    Solid Na2SO4 is added to a solution which is 0.014 M in Pb(NO3)2 and 0.041 M in AgNO3. Assume the volume remains constant. Ksp = 2.0 10-8 for PbSO4 and Ksp = 1.2 10-5 for Ag2SO4. (a) Which compound precipitates first? 1 PbSO4 (b) What is the concentration of the first ion ...
  44. 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 which compound would ...
  45. chemistry

    Organic hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. In the simplest case, ethene (C2H4) and H2 form ethane (C2H6). If 132 kJ is given off per mole of C2H4 reacting, how much heat is ...
  46. Chemistry

    Organic hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. In the simplest case, ethene (C2H4) and H2 form ethane (C2H6). If 124 kJ is given off per mole of C2H4 reacting, how much heat is ...
  47. Chemistry

    1. The organic compound triphenylmethane (C19H16) when pure melts at 171.04 degrees c. When 1.92 grams of hexachlorobenzene (C6CL6) is mixed with 3.74 grams of triphenhlmethane, the melting point of the mixture is 163.19 degrees calcius. Calculate the freezing point depression...
  48. Chemistry

    Organic hydrogenation reactions, in which H2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. In the simplest case, ethene (C2H4) and H2 form ethane (C2H6). If 124 kJ is given off per mole of C2H4 reacting, how much heat is ...
  49. Chemistry

    Why do you spot multiple times? Select one or more correct answers. A. To fill the capillary almost instantly by capillary action. B. So the developing chamber solvent does not evaporate. C. The higher compound concentration facilitates visualization. D. To acheive a high ...
  50. Chemistry Dr Bob

    A voltaic cell has one half-cell with a Cu bar in a 1.00 M Cu2+ salt and the other half-cell with a Cd bar in the same volume of a 1.00 M Cd2+ salt. Report your answers to the correct number of significant figures. a)Find E degree cell, delta G degree , and K. b)As the cell ...
  51. Chemistry Dr BOB

    A voltaic cell has one half-cell with a Cu bar in a 1.00 M Cu2+ salt and the other half-cell with a Cd bar in the same volume of a 1.00 M Cd2+ salt. Report your answers to the correct number of significant figures. a)Find E degree cell, delta G degree , and K. b)As the cell ...
  52. Conductivity

    Complete the table below: For each of the following sets pick the compound with the highest conductivity in a 1 M aqueous solution. (Enter the number at the top of the column containing the correct answer.) 1 2 3 Answers a HCl HC2H3O2 H2PO4– b KNO3 Ca(NO3)2 HNO3 c CH3OH NaOH...
  53. complete and balnces theses reactions

    how do i complete and balnces theses reactions???? CH3-CH2-CH3 (g) + Br2 (l) --> like how in the world????? do i do this? lol aint got a clue wish i would have listened at school now. Alkanes usually react with a halogen to form one of several halides. The simplest reaction...
  54. 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 data. C. A scale is ...
  55. 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 easier than letting ...
  56. 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 114 mmHg at 25 ¢XC. ...
  57. Chemistry

    When solid magnesium nitride reacts with water the reaction produces solid magnesium hydroxide and ammonia gas. If 22.9 grams of magnesium nitride are added to 31.0 grams of water, how many liters of ammonia should be produced (assuming standard temperature and pressure)? ...
  58. chemistry

    0.702g of arsenic an oxide of arsenic mass 0.927g how do i calculate the mass of oxygen that combines with 1 mole of arsenic atoms to form the oxide of arsenic. how many moles of oxygen atoms does this mass represent a and then using that answer i have to obtain an empiricl ...
  59. english

    11.Which of the following pairs of ideas could be combined into a compound sentence? (Remember that only related ideas should be joined into a compound sentence.) A. The days became longer. The children could play outside later. B. The street lights were dim. The play was a ...
  60. Chemistry

    What is the empirical distinction between emission and absorption spectra? In general terms, how did Niels Bohr explain each of these spectra? In general terms, emission spectra are obtained when the electron is at a high energy level and it falls to a lower energy level. In ...
  61. math

    A company will need $65,000 in 6 years for a new addition. To meet this goal the company deposits money in an account today that pays 5% annual intrest compound quarterly. Find the amount that should be invested to total $65,000 in 6 years. the company should invest?
  62. Chemistry

    Photochemical reations (reactions that use light) are unique. In certain cases, reactions that are more dilute are more rapid than those that are more concentrated. Suggest an explanation for this observation. As the concentration of the photolyzed compound increases, ...
  63. chemistry - Dr.Bob222 please help

    Hi Everyone, Anyone want to try giving these a shot? The right electrode in a cell is a piece of copper immersed in a 1.00 L solution of 0.0701 F copper sulfate. The left electrode is a galvanized nail (i.e., an iron nail that is completely coated with a layer of zinc), ...
  64. Chemistry

    When an ionic compound dissolves in water, splitting into its respective ions, the positive ions will be attracted to the _________ end of the water molecule. A. neutral B. partially positive C. partially negative
  65. math

    Ram and shyam jointly lend out rs17261 at 20% per annum compound interest such that rams amount for 2 year is same as is the shyams amount for 5 years.by how much does rams sum exceed shyams sum?
  66. chemistry

    draw a diagram showing the arrangement of the valency electrons in one molecule of the covalent compound selenium chloride. use x to represent an electron from an atom of selenium. use o to represent an electron from an atom of chlorine
  67. business math and statistics

    A simple interest calculation provides a useful estimate of what compound interest will be if(a) the dollar amount is small.(b) the dollar amount is large.(c) the term is long.(d) the term is short.
  68. physics

    a compound microscope has an eyepiece of focal length 10 c.m and an objective of focal length 4c.m.the magnification of an object is placed at a distance of 5 c.m from the objective so that the final image is formed at the distance of distinct vision (20 c.m) is
  69. algebra- Help fast

    use the compound interest formula A=P(1+r/n)^nt and A=Pe^rt to solve 1-Find the accumulated value of an investment of $5000 at 9% compounded continuously for 6 years. 2-Find for an investment of $700 at 16% compounded quarterly for 2 years.
  70. Math

    are the events of drawing a knight from the bag of white pieces and drawing a pawn from the bag of black pieces dependent or independent events? find the probability of this compound event.
  71. Chemistry 106

    An unidentified metal forms an ionic compound with the carbonate anion. The metal forms a 2+ cation. If the minimum ration of the number of protons in the metal to the oxygen protons s 5:6, what is the metal?
  72. Chemistry

    A 2.50 gram sample of bronze was dissolved in sulfuric acid. The copper in the sample reacted with sulfuric acid to form copper sulfate. Cu (s) +2 H2SO4 (aq) -> CuSO4 (aq) +2 H2O (l) The copper sulfate formed in this reaction was mixed with I to form copper iodide: CuSO4 (...
  73. chemistry

    Most Soluble compound CuS, Ksp = 1.27 x10^-36 PbS, Ksp = 9.04 x 10^-29 AgCl,Ksp = 1.77 X 10^-10 AgI, Ksp = 8.51 x 10^17 My book states that AgCl is insoluble in water and so are MOST phosphates and Sufides, So am I reasonable to say that AgI is the answer on this one?
  74. chemistry

    benzene ring-N-H-CH3 H \ N-benzene ring / CH3 select the class of compound from the choice below. 1-acetal 2-alcohol 3-alkene 4-amide 5-amine 6-carboxylic acid 7-ester 8-haloalkane IS THAT AMINE
  75. algebra--1 question

    Choose the compound inequality all real numbers that are less than -3 or greater than or equal to 5 this is the problem i wrote out: x < -3 or x 'greater than or equal to' 5 (i don't have the sign) i know that's the problem written as an inequality but i do not have my ...
  76. Chemistry

    A 100 L reaction container is charged with 0.724 mol of NOBr, which decomposes at a certain temperature** (say between 100 and 150 oC) according to the following reaction: NOBr(g) ↔ NO(g) + 0.5Br2(g) At equilibrium the bromine concentration is 1.82x10-3 M. Calculate Kc (...
  77. chemistry DR BOB

    A voltaic cell has one half-cell with a Cu bar in a 1.00 M Cu2+ salt and the other half-cell with a Cd bar in the same volume of a 1.00 M Cd2+ salt. Report your answers to the correct number of significant figures. a)Find E degree cell, delta G degree , and K. b)As the cell ...
  78. Chemistry

    Thanks for the help earlier My question Silicon tetrachloride (SiCl4) can be prepared by heating Si in chlorine gas: Si + 2Cl2 yields SiCl4 In one reaction 0.507 mole of SiCl4 is produced. How many moles of molecular chlorine were used in the reaction? Ok is it makeing ...
  79. Solvent temp

    Question: A student dissolved 0.30 g of a crude product in 10.5mL (the minimum amount required) ethanol at 25 degrees C. He cooled the solution in an ice-water bath for 15 minutes and obtained beautiful crystals. He filtered the crystals on a Hirsch funnel and rinsed them with...
  80. Chemistry II

    C4H4 (g) + 2 H2 (g) --> C4H8 (g) Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341 kJ/mol), C4H8 (-2755 kJ...
  81. Chemistry

    A- a water soluble salt forms a precipitant during Group 3 analysis. An acidic solution of this precipitant and NaBiO3 yields a pinkish color. This same salt has no reaction to concentrated H2SO4 or AgNO3, what is the chemical formula for this salt? B- a brown colored salt ...
  82. Chemistry

    A- a water soluble salt forms a precipitant during Group 3 analysis. An acidic solution of this precipitant and NaBiO3 yields a pinkish color. This same salt has no reaction to concentrated H2SO4 or AgNO3, what is the chemical formula for this salt? B- a brown colored salt ...
  83. chemistry

    What does it mean when the sulfuric acid is written ABOVE the arrow in a reaction?
  84. Science

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

    The half-reaction of 3 Pb + 2 NO3 + 8 H-->3 Pb2+ + 2 NO + 4H2O
  86. college

    What is the molecularity of the elementary reaction? SO_3(g)-->SO_2(g)+O(g)
  87. Chemistry

    Is this reaction exothermic or endothermic? Fe(NO3)3+ NaSCN
  88. Chemistry

    Calculate delta g and Kp for the following equilibrium reaction. Keep getting 7.2E-81 and the answer is 4.5E-81 Why?
  89. chemistry

    Write a balanced reaction for the formation of Fe2O3 (s)?????
  90. science

    the spectator ions of all substance that are soluble of the reaction
  91. chemistry

    What are the products of a reaction between NaCl, HNO3, and AgNO3?
  92. Science

    What is the combustion reaction for Isopropyl Alcohol (C3H8O)?
  93. chemistry

    could the products ever become the reactants in chemical reaction? explain. thanks!
  94. Chemistry

    Can the reaction 2Ni(s)+MgSo4(aq) occur.Explain why?
  95. Chemistry

    How many grams of Ni(OH)2 are produced from the reaction of 30.0 mL of 1.75 M NaOH solution?
  96. chemistry

    reaction between iron fillings and su lphur will form
  97. science

    what kind of reaction is the formation of sodium chloride
  98. chemistry

    questions related to yield of chemical reaction.
  99. Chemistry

    In which condition(s) can I get this reaction: Fe + H2SO4 = Fe2(SO4)3 + H2
  100. Chemistry

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