1. Science 7R

    A microscope that uses lenses and objectives to magnifying is the______ a. compound light microscpe b. scanning electron microscope c. transmission electron microscope {d} atomic force microscope am I correct???? If I'm wrong please explain why and tell me
  2. Eng

    A clause from sentence (I) has been turned into a (n) _____ in sentence (ii). (i) Since she knew what the lecture was about, she didn't attend the meeting. (ii) Knowing what the lecture was about, she didn't attend the meeting. A. compound predicate B.
  3. Dr.Bob

    I had to take cereal crush it up and place it in a crucible and cook it tell it was black ash. Then I took that burnt ceral and placed it into a beaker with HCL and water and boiled it tell the cereal was like a liquid cause coming out of the crucible it
  4. algebra

    Compound word problem Sarah decides to open up her own bank account for her schooling and wants to save money. She decides to put $500.00 in the savings account she is opening. The amount she earns has 8% interest and it’s compounded quarterly. How much
  5. Algebra

    Please Help!!!! thanks :) 1. Suppose U= {1,2,3,4,5,6,7,8,9,10} is the universal set, and P= {2,4,6,8,10}. What is P'? a: {1,2,3,4,5,6,7,8,9,10} b: {3,5,7,9} c: {1,3,5,7,9}*** d: {2,4,8} 2. If D is the set of natural numbers that are whole numbers less than
  6. Language

    Compound words are two words that have been joined together to create a new word. The new word is related to both the smaller words. a) back/fore/under +_______ b) bank/cook/text + _______ c) blue/goose/straw + ______ d) day/flash/high + _________ e)
  7. geometry

    An army base is enclosed by a wire fence so that it forms a circular compound. The entrance to the base is located at X(3, 6) and the exit is at Y(9, 14). X and Y are end points of a diameter of the circle. A search tower is positioned at Z(2, 13) on the
  8. Grammar

    1.Which of the following sentences have (unreduced) compound clauses? Briefly explain your answer. a.I like cities with parks and public sculptures. b.Everyday he either burns the toast or overcooks the eggs. c.Neither does he drink nor does he swear.
  9. Chemistry - Answer Check

    Gaseous hydrogen and iodine are placed in a closed container at 425 degrees Celsius. The reactants react to produce the gaseous compound hydrogen iodide, which partially decomposes back into hydrogen and iodine gas as shown below. H2 (g) + I2 (g) 2HI (g)
  10. Chemistry Pretest

    1. What mass of the compound FeWO4 contains 50.0 grams of tungsten (atomic symbol W, atomic number= 74)? **Formula mass of FeWO4 is 303.69** a) 30.0 g FeWO4 b) 304 g FeWO4 c) 82.6 g FeWO4 d) 188 g FeWO4
  11. EW! GRAMMAR!

    Can someone help me find GOOD pratice tests for Prepositional phrases, Participial phrases, gerunds phrases, infinitive, appositive, adjective phrase, adverb phrases, main clause, subordinate clause, complex clause and compound complex clause Thanks!
  12. science

    if one mole of the compound AL4C3 has a mass of 144g and mole of carbon has a mass of 12g, calculate the relative atomic mass of the element aluminium any ideas to the answer would be great thanks 4*(Al, amu)+ 3*12 = 144 Solve for "Al,amu", the atomic mass
  13. Chemistry

    we created a nickel coordination compound made of nickel and chlorine and we used silver nitrate to titrate it. If the silver nitrate solution had been exposed to light and reacted with chlorine, would the calculated percent of nickel been higher or lower
  14. Chemistry

    Equation: Fe+CuCl2>FeCl2+Cu We put two iron nails into the copper chloride solution:1. mass of empty dry beaker:103.64 2. mass of two iron nails, before reaction:1.20 3. mass of two iron nails after reaction: 1.01 4. mass of beaker and copper (dry):104.4
  15. math

    Consider an 8% coupon bond selling for $953.10 with three years until maturity making annual coupon payments. The interest rates in the next three years will be, with certainty, r1 = 8%, r2 = 10%, and r3 = 12%. Calculate the yield to maturity and realized
  16. writing skills

    8. A clause from sentence (i) has been turned into a(n) _______ in sentence (ii). (i) Since she knew what the lecture was about, she didn't attend the meeting. (ii) Knowing what the lecture was about, she didn't attend the meeting. A. compound predicate B.
  17. ELA

    A clause from sentence (i) has been turned into a(n) _______ in sentence (ii). (i) Since she knew what the lecture was about, she didn't attend the meeting.  (ii) Knowing what the lecture was about, she didn't attend the meeting.  A. phrase B. compound
  18. writing skills

    A clause from sentence (i) has been turned into a(n) _______ in sentence (ii). (i) Since she knew what the lecture was about, she didn't attend the meeting. (ii) Knowing what the lecture was about, she didn't attend the meeting. A. relative pronoun B.
  19. Chemistry

    1. The standard heat of formation of glucose and lactic acid are -1274.45 and -694.04 kJ/mole, respectively. The molar heat capacity of the two compounds are 218.86 and 127.6 J/(mol)K a.) What is the total heat of reaction at 25 degree Celsius for the
  20. PSYCH

    1 Which of the following is NOT one of the three fundamental features of science? a empirical questions b public knowledge c mathematical equations (My Answer) d systematic empiricism 2 A set of beliefs can be said to be pseudoscientific if it lacks one or
  21. Psychology

    1 Which of the following is NOT one of the three fundamental features of science? a empirical questions b public knowledge c mathematical equations (My Answer) d systematic empiricism 2 A set of beliefs can be said to be pseudoscientific if it lacks one or
  22. Chemistry

    AlCl3(aq)+ NH4OH(aq)-> Al(OH)3(s) + NH4Cl(aq) AlCl3(aq)+ 3NH4OH(aq)-> Al(OH)3(s) + 3 NH4Cl(aq)... is balanced-- Now total ioic?? Is this right?? : Al +3Cl+3NH4 +OH --> Al+ 3OH+ 3NH4+ 3Cl Crossing out on both sides I end up with OH --> 3OH I do not know
  23. Chemistry

    Acid Question!? An unusual category of acids known as superacids, which are defined as any acid stronger than 100% sulfuric acid, can be prepared by seemingly simple reactions similar to the one below. In this example, the reaction of anhydrous HF with
  24. chemistry

    1. A website promoting the use of alternative energy vehicles and hybrid technologies claims that, \"A typical automobile in the USA uses about 500 gallons of gasoline every year, producing about 5 tons of carbon dioxide.\" To determine the truth of this
  25. Chemistry

    Magnesium sulfate is often used it first aid hot-packs giving off heat when dissolved in water. When 2.00 g of MgSO4 dissolves in 15.0 mL of water (d= 1.00g/mL) at 25.0ºC, 1.51 kJ of heat is evolved. A) Write the balanced equation for this reaction. I
  26. AP Chemistry

    Could you please review my work and see what i'm doing incorrectly? Thank you Given this information: CxHyOz (s) + O2 (g) ----> CO2 + H20 given: 2.165 g of the unknown hydrocarbon v = 1.868 L P = 130.2 kPa T = 65.0 degrees C g of H2O = 1.818 a)find g H in
  27. science

    Numbers 1-9 are true and false questions.Check if my answers are right and if I didn't write anything on the blank, I need help with them. Thanks!!!! _____ 1. Velocity could be reported as 50 k/hr. True 2. How far an object travels in a certain period of
  28. psychology

    As an undergraduate Native American college student you have been selected from a national pool of applicants to interview President Obama. Your scheduled interview is to be no longer than 10 minutes. The interview is to be conducted on a Tuesday morning
  29. Science

    Helloo.. i got a worksheet about compounds,elements andnumber of elements. it tells me to list the elements and number of atoms found in each of the compounds and i don't understand how to do get the elements and the # of atoms in the equation.. PLease
  30. chemistry

    i already posted this question, but im still confused on it. Dinitrogentetraoxide partially decomposes according to the following equilibrium: N2O4 (g) -> 2NO2 (g) 2NO2 (g) Initial conc. 0.400 mol 0 mole (no reaction yet) Change -0.3945 mol + 2 x 0.3945
  31. Chemistry

    Methyl salicylate, C8H8O3, the odorous constituent of oil of wintergreen, has a vapour pressure of 1.00 torr at 54.3oC and 10.0 torr at 95.3oC. a) What is its vapour pressure at 25oC? b) What is the minimum number of liters of air that must pass over a
  32. College Chemistry

    Suppose there are two known compounds containing the generic elements X and Y. You have a 1.00-g sample of each compound. One sample contains 0.29 g of X and the other contains 0.38 g of X. Identify plausible sets of formulas for these two compounds. Check
  33. accounting

    A compound transaction was recorded as follows: debit Equipment, $5,000; debit Cash, $1500; credit Accounts Payable, $3,500. This error would cause __________. A. assets to be overstated B. assets to be understated C. liabilities to be overstated D.
  34. chemistry

    given: Ferrocene, Acetylferrocene, 1, 1' Diacetylferrocene What part of the ferrocene compound(s) is(are) responsible for creating a dipole moment What type of molecular orbitals does the cyclopentadienyl ligand use to bond with the iron ion? How many
  35. chemistry

    The amount of 2.00 mol of a solid ionic compound was dissolved in 225 mL of water in an insulated container. The initial temp of water was 20 deg. C and the final temp. was 47.8 deg C. What is the delta heat Dissolution? Assume the heat absorbed by the
  36. math

    A sum is invested at compound interest payable annually. The interest in two successive years was Rs 900 and Rs 981. Find the sum. If the sum of all internal angles and sum of all external angles of a regular polygon are equal, then the number of sides of
  37. Maths

    1.The value of an investment grows from R2200 to R3850 in 8 years. Determine the simple interest rate at which it was Invested. 2. James had R12000 and invested it for 5 years.If the value of his investment is R15600, what compound interest rate did it
  38. science

    describe the difference between a ball-and-stck model and a space-filling model of a compound ? Vanessa--Have you seen a ball-and-stick model and a space-filling model? If so you will know how to answer this. dont give me stupid answers i can on for help
  39. Compound math

    (Future Value) Suppose you invest $8000 into an account that pays an annual interest rate of 6.2%. How much is in the account after 30 years if a. simple interest is compound monthly? b. interest is compounded monthly? c. interest is compounded daily?
  40. English

    Which of the following sentences is an example of a compound sentence? in the entire world, there is only one art museum for children's art, and is located in Norway ian and Charlotte worked and saved enough for a trip to Scotland the museum is the
  41. geometry

    let p represent the statement, JIm plays football," and let q represent " Micheal plays football." Convert the compound statement into symbols.
  42. Chemistry

    For a particular reaction at 195.1 °C, ΔG = -1488.09 kJ/mol, and ΔS = 288.67 J/(mol·K).? Calculate ΔG for this reaction at -20.0 °C. delta G = delta H - (T*delta S) -1488.09 kJ/mol = (delta H) - ((461.8K)*(+288.67 J/(mol x K))*(1 kJ/1000 J)) -1488.09
  43. biochem

    2) Compound called Moniliformin has been shown to affect pyruvate dehydrogenase complex activity and inhibit the conversion of pyruvate to acetyl coA. Without knowing specific details on how this drug exert its inhibitory effect, could you outline
  44. Chemistry

    At 22 °C an excess amount of a generic metal hydroxide M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.56. What is the Ksp of the compound at 22 °C? I have found my [OH-] concentration (3.63x10^-4) but I'm not sure I'm
  45. Chemistry

    Consider the following equilibrium process at 686 C C02(g)+H2(g)=CO(g)+H20(g) The equilibrium concentration of the reacting species are [CO]=0.050M, [H2]=0.045M, [CO2]=0.086M, and [H20]=0.040M. (a)Calculate the Kc for the reaction at 686 C. (b) If we add
  46. Chemistry

    considering the polarity of each compound and that of a solvent in which it is dissolved (including the potential for hydrogen bonding), give a brief explanation of each result: a) malonic acid in water - which i know is soluble b) malonic acid in hexane -
  47. science

    At 472 deg C the reaction reaches equilibrium with the following composition: [H2]=7.38atm, [N2]=2.46atm, [NH3]=0.166atm. Into the equilibrium mixture 1.5 atm of N2 is introduced: a. Calculating Kp and Q, determine in which direction the reaction will
  48. Chemistry

    Consider the compounds 4-tert-butylcyclohexanol and 4-tert-butylcyclohexanone. Using silica gel plates, which of the two compounds will have the higher Rf value when ethyl acetate is the developing solvent? Which will have the higher Rf value when
  49. College Algebra

    Penelope is playing a number game with her sister June. Penelope is thinking of a number and wants June to guess it. Five more than two times a number is between 1717 and 2121. Write a compound inequality that shows the range of numbers that Penelope might
  50. language arts

    John Yinger thinks that the natural-born clause should be removed because (1 point)it makes international policy more difficult. it goes against a central principle of American democracy. it damages the relationship between American citizens and immigrant
  51. Science

    A Portland cement sample contained 20% SiO2 by weight derived from two silicate compounds. SiO2.2 CaO and SiO2. 3CaO that are present in the cement in the mole ratio 3:4. Determine the percent by weight of each silicate compound in the cement.
  52. Chem

    Epsom salts consist of magnesium sulfate heptahydrate. Write its formula. a) How many atoms of oxygen are in 5.15g of Epsom salts? b) How many formula units of the compound are present in 5.15g? c) How many moles of water molecules are in 5.15 g of Epsom
  53. Chemistry

    Given the following data for a hypothetical reaction: M3+ (aq)+ L-(aq) ⇋ [ML]2+(aq); calculate the equilibrium concentration of [ML]2+in the trial solution and Kc based on this single trial run of the equilibrium reaction. Standard solution data:
  54. maths-- compound interest

    find the compund interest on $2500 for one year at 4% per annum compounded half-yearly. which of these is correct? $2500(1 + 0.04)^2 or $2500(1 + 0.02)^2 The second one. 2500(1+.02)^2 Since the interest is compounded semi-annually you have to divide the
  55. chemistry

    Carbon reacts with chlorine and hydrogen to form the compound CH3Cl. (a) Construct the structure of CH3Cl. What is the dominant form of secondary bonding for CH3Cl? Dipole-dipole interactions, London dispersion forces, Covalent bonding, Ionic bonding
  56. Chemistry

    Can someone check my answers please? I had specific trouble with 7, 13, and 27 (I'm pretty sure my other answers are correct; some reassurance would be nice though). And I have a small question about 8. 1. The ΔHf of an element in its standard state is
  57. Chemistry

    Very confused! Converting between grams of a compound and grams of a constituent element Determine the mass of oxygen in a 5.8 g of NaHCO3 5.8 g NaCHO3 * 1 mol NaCHO3/ 84.01 NaCHO3 * 48.00 mol O / 1 mol NaCHO3 * 16.00 g O/ 1 mol = I got 53 but the answer
  58. Chem

    Hi! I need help with this question: Sulfur dioxide reacts with chlorine at 227 oC: SO2(g) +Cl2(g) ↔ SO2Cl2(g) Kp for this reaction is 5.1 x 10-2 atm-1. Initially, 1.00 g each of SO2 and Cl2 are placed in a 1.00 L reaction vessel. After 15 minutes, the
  59. Algebra

    Penelope is playing a number game with her sister June. Penelope is thinking of a number and wants June to guess it. Five more thank three times a number is between 23 and 32. Write a compound inequality that shows the range of numbers that Penelope might
  60. College Algebra

    Penelope is playing a number game with her sister June. Penelope is thinking of a number and wants June to guess it. Five more thank three times a number is between 23 and 32. Write a compound inequality that shows the range of numbers that Penelope might
  61. chemistry

    Why are cis and trans isomers not possible for ClCH2CH2Cl? Because it is a single bonded compound and cis-trans isomerism is only possible when fre rotation about a bond is restricted or a double bond or cycle is essential for existence of cis-trans
  62. science(chem)

    CH3CHClCH2Cl vs. CH2ClCHClCH3 How would I know if : -The two formulas represent different compounds which are constitutional isomers. -The two formulas represent different compounds that are not isomeric. -The two formulas represent the same compound. ~if
  63. chemistry

    i am working on a practice worksheet and need help with a few i can not understand. please and thank you. I have to post them separately sorry 49.how many grams of water are needed to completely hydrolyze 30.8 g of the ester? A.0.416 g B.30.8 g C.11.3 g
  64. chem

    For the following reactions, name the Bronsted-Lowry acids and bases. Then name the conjugate acid and bases. H3O+(aq) + CN-(aq) HCN(aq) + H2O I'm really confused on this whole concept even thought it's not really difficult. I said: acids: H3O+ bases: CN-
  65. Finite math

    A bank account pays interest at 12% compounded monthly, and has a monthly fee of $10, deducted at the end of each month. If $13,000 is deposited on January 1, 2013, how much is in the account on January 1, 2016? I have done some question related to
  66. business math

    . Compute the amount of compound interest earned in 1 year for an investment of $1,000,000 with a nominal interest rate of 8% compounded quarterly. Compute the Annual Percentage Yield (APY) for the investment in the previous question. (Round APY to the
  67. contemporary math

    Compute the amount of compound interest earned in 1 year for an investment of $1,000,000 with a nominal interest rate of 8% compounded quarterly. Then Compute the Annual Percentage Yield (APY) for the investment in the previous question. (Round APY to the
  68. Chem Very Urgent

    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
  69. Chemistry

    Consider the reaction Zn(OH)2(s) + 2CN-(aq) Zn(CN)2(s) + 2OH-(aq) a) Calculate K for the reaction. (Ksp Zn(CN)2= 8.0 x 10^-12) b) Will Zn(CN)2 precipitate if NaCN is added to a saturated Zn(OH)2 solution? I tried splitting this into two equations:
  70. chemistry

    Predict how the compound Calcium Chloride would react to calcium nitrate, silver nitrate, Silver Nitrate + Ammonium Hydroxide,Silver Nitrate + Sodium Thiosulfate?
  71. Chemistry

    drwls, if you are there, I got an answer of 42.5 Kelvin, so then that means it is a negative number if converted to degrees Celsius? Question: The heat capacity of a bomb calorimeter is 87.5 kJ/K (this value is for the total heat capacity including that of
  72. AP Chem

    Lead metal is added to a solution of hydrochloric acid. What would be the theoretical cell potential, E°, for the reaction?
  73. Chemistry

    What would the reaction of these two look like (reactants and products) A) hexanal is reduced B) Butanoic acid is neutralized by potassium hydroxide
  74. chemistry

    what is the relationship between reaction rate and shape of equilibrium graph in terms of concentration versus time?
  75. chemistry

    what is the volume in liters in H2gas produced at 24 degree celsius and 835 mmhg from the reaction of 12g of many thanks
  76. chemistry

    The basicity of tetraoxosulphate(6) is 2. explain this statement with an equation showing the reaction between the acid and potassium hydroxide
  77. Chemistry

    Complete and balance the precipitation reaction. Include physical states in your answer. CuCI2(aq)+Na2CO3(aq)
  78. Science

    How would you prove that sodium hydroxide is a base without using a litmus paper to test? Give the equation for the reaction?
  79. Chemistry

    How much work (in J) is involved in a chemical reaction if the volume decreases from 5.00 to 1.26 L against a constant pressure of 0.857 atm?
  80. chemistry

    At what temperature will the following reaction happen spontaneously, given that ΔH=8.91×103J and ΔS= –219.20 J/K? CaSO4(s) + 2HCl(g) → CaCl2(s) + H2SO4(l)
  81. chemistry

    How many grams of Mg(OH)2 would be produced from 4 mol KOH? if the balanced reaction is MgCl2 +2KOH arrow Mg(OH)2 + 2KCl?
  82. chemistry

    The rate constant for this first-order reaction is 0.0570 s–1 at 400 °C. A-->Products After how many seconds will 14.0% of the reactant remain?
  83. Half-Life

    The rate constant for this first-order reaction is 0.0990 s–1 at 400 °C. A --> products After how many seconds will 10.0% of the reactant remain?
  84. Chemistry

    Which of these is best described as an acid-base reaction? KCl + NH4NO3 = KNO3 + NH4Cl NH3 + H2O = NH4 + OH
  85. Chem

    Complete and balance the reaction of A) (CH3)2NH(aq)+CH3COOH(aq)→ B) CH3CH2NH2(aq)+HBr(aq)→ C) CH3NH2(aq)+HCOOH(aq)→
  86. Chemistry

    How do I find the POtential Energy for a reaction from strontium chloride and potassium carbonate? and what is the chemical reactions for the above
  87. Chemistry

    A chemist ran the reaction and obtained 5.70 of ethyl butyrate. What was the percent yield? How do I solve this problem?
  88. Chemistry

    Please help me answer the question: What does it mean Write a net ionic equation for the reaction 2HCl + Ca(OH)2 -> CaCl2 + 2H20
  89. organic chemistry

    What is the product of reaction of triphenylmethanol heated up with 40% HI in glacial acetic acid and then treated with sodium bisulfite?
  90. science, biology

    How might the chewing of food be related to the rate of a chemical reaction-digestion- that occurs in your body? explain
  91. Chemistry

    Write the net ionic equation for the precipitation reaction between ammonium sulfide and cadmium nitrate.
  92. Science HELP!

    The body's reaction to information is to send these to the brain. A. Neurons B. Impulses C. Dendrites D. Synapse Is the answer B? Thanks
  93. pmdc

    Calculate the mass of Mg metal required to consume 2560g of CO2 in the reaction. 2Mg+CO2_2MgO+C
  94. science

    In the equation: Fe(NO©ý)©ý (aq) + 3KSCN (aq) ¡æFeSCN©ý (aq) + 3KNO©ý (aq) Why do two aqueous solutions form? What is this calle? Is there a seconday reaction?
  95. Chemistry

    Identify the acid or base behavior of each substance in this reaction: H2PO4 + H2O H3O+ + HPO4-
  96. O-CHEM

    Formic acid is only readily soluble in water and in both 0.6 M NaHCO3 and 2.5 M NaOH. give a brief explanation of the reaction for each
  97. Chemistry

    Formic acid is only readily soluble in water and in both 0.6 M NaHCO3 and 2.5 M NaOH. give a brief explanation of the reaction for each
  98. Chemistry

    Predict the product(s) and write a balanced equation for the following redox reaction: pentane (C5H12) + oxygen ---->
  99. organic chemistry

    Assuming that an average 1 oz of black tea contains approximately 6 mg of caffeine, determine the experimental and %yield of the reaction.
  100. Chemistry

    Right, for the reaction of hot sodium hydroxide plus chlorine , how come one of the products are 5NaCl and not Na5Cl seeing as we now know the oxidation state of cl is -5