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A compound contains 54.53% carbon, 9.15% hydrogen and the rest is oxygen. how many hydrogen atoms are in the simplest (empirical) formula of the compound?
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A reaction requires 22.4 L of gas at STP. You have 30.5 L of gas at 105 kPa and 373 K. Which of the following statements is true? Use ideal gas law A You will have enough gas for a reaction B You will
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Balance the following reaction. A coefficient of "1" is understood. Choose option "blank" for the correct answer if the coefficient is "1." ___ Ca(OH)2+ ___ H3PO4 —> ___ Ca3(PO4)2 + ___ H2O
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Calculate the amount of heat released when 27.0 g H2O is cooled from a liquid at 314 K to a solid at 263 K. The melting point of H2O is 273 K. Other useful information about water is listed below. Cp,
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Which solutions most concentrated ? 1) 0.1 mole of solute dissolved in 400 ml of solvent 2) 0.2 mole of solute dissolved in 300 ml of solvent 3) 0.3 mole of solute dissolved in 200 ml of solvent 4) 0
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A 0.4776 g sample of aluminum reacts according to our experiment to produce alum. 5.0385 g of dried alum crystals are recovered. What is the percent yield of the experiment?
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If the Fe2+ concentration in a saturated solution of iron (II) oxalate is determined to be 5.47x10-4M, what is the calculated Ksp for iron (II) oxalate?
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How well can you apply Boyle’s law to this sample of gas that experiences changes in pressure and volume? Assume that temperature and number of moles of gas are constant in this problem. Using the f
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PLZ HELP ILL GIVE U BRAINLEST!!!!!!!! A cold air mass from the north is blocked by a warmer air mass from the south. However, the air masses are not strong enough to push each other out of the way. As
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Consider the reaction pathway graph below. mc023-1.jpg Which conclusion can be accurately drawn from the graph? mc023-2.jpgHrxn for the complete reaction is negative, but Ea is positive. mc023-3.jpgHr
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A solution is made by dissolving 10.20 grams of glucose (C6H12O6) in 355 grams of water. What is the freezing point depression of the solvent if the freezing point constant is -1.86 °C/m? Show all of
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Erik, a forensic technician, is called to a crime scene to determine if there are any fingerprints. He uses the process of photoluminescence to find the evidence. Which scientific field did he use?
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In steps 8 and 9, you imagined that energy was added to the molecule. What processes would occur in the cell to add this energy?
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Oxygen travels at a velocity of 29.0 m/s. at what velocity would sulpur tetrafluoride travel under the same conditions?
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Write the net ionic equation for this reaction occurring in water: sodium phosphate and calcium chloride are mixed to form sodium chloride and calcium phosphate.
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What volume (in milliliters) of 0.250 m naoh should be added to a 0.140 l solution of 0.0150 m glycine hydrochloride (pka1 = 2.350, pka2 = 9.778) to adjust the ph to 2.63?
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What is the molarity of a naoh solution if 28.2 ml of a 0.355 m h2so4 solution is required to neutralize a 25.0-ml sample of the naoh solution?what is the molarity of a naoh solution if 28.2 ml of a 0
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A solution is made by dissolving 0.08100 moles of ba(oh)2 in enough water to make 670 ml of solution. what is the ph of the resulting solution?
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Write a balanced chemical equation for the decomposition of solid sodium sulfide in aqueous solution.
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Roberto has a sample of an unknown liquid. The label in the bottle of the sample indicates that the liquid has a mass of 117 grams and a volume of 15 cubic centimeters. What is the liquid in the bottl
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Balance the following equations: a. Pb(NO3 )2 (aq) + NaOH(aq) → Pb(OH)2 (s) + NaNO3 (aq) b. C12H22O11(l) + O2 (g) → CO2 (g) + H2O(l) c. Al(OH)3 (s) + H2SO4 (aq) → Al2 (SO4 )3 (aq) + H2O(l)
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How do you overcone or reduce the problem of random error and systematic error while doing an experiment
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Using these excerpts, which government system would be MOST like the United States' government and why? A) Saudi Arabia because it is a unitary government where the leader holds most of the power. B)
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How many hybrid orbitals do we use to describe each molecule c2h5no (4 c−h bonds and one o−h) key?
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Below is the reaction that produces the glucose donor used in glycogen synthesis, where r is uridine. modify the molecules to show the products of the reaction. then answer part (b) below.
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Draw the organic product of the reaction of 1-butene with , . in your answer draw the expanded structure for the acetate group (ac).
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Would having different atmospheric pressure have a effect on the accuracy of gas laws?and if so, which planets should be most reliable and least
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A chemist prepares a sample of helium gas at a certain pressure, temperature and volume and then removes all but a fourth of the gas molecules (only a fourth remain). How must the temperature be chang
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Hydroxy aldehydes a and b readily cyclize to form hemiacetals. draw one of the stereoisomers formed in this reaction from both a and b. select why this process gives an optically inactive product mixt
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In spectroscopy experiments, the solution used to calibrate the spectrometer is known as the "blank." a mixed dye solution contains an unknown amount of fluorescein dye and 5.0 × 10–6 m blue #1 dye
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Compound a, c6h12o2, was found to be optically active, and it was slowly oxidized to an optically active carboxylic acid b, c6h12o3, by ag(nh3)2. oxidation of a by anhydrous cro3 gave an optically ina
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The atoms of a metalloid have 6 valence electrons. The metalloid is used as a semiconductor. Which best describes the electron shell in which the valence electrons are located?
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Explain how a nuclear power plant functions and what safety precautions must be taken to ensure the safety of the power plant, its employees, and the environment.
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If a 900.0-g sample of radium-226 decays to 225.0 g of radium-226 remaining in 3,200 years, what is the half-life of radium-226?
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An advantage of biomass-to-liquid fuel synthesis is that there is no net increase of carbon into the atmosphere. /11106046/9722ca9d?utm_source=registration
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Electromagnetic radiation with a wavelength of 525 nm appears as green light to the human eye. The frequency of this light is ________ s-1.
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A given atom has 3 protons, 4 neutrons and 3 electrons . Describe how you can use those three values to deacribe the structure and mass of the atom
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Stuart designed and built a water filter in class. He wants to know if it will make water from lakes or streams safe to drink. Which of the following would it be best for Stuart to measure in an exper
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When 1.550 g of liquid hexane (c6h14) undergoes combustion in a bomb calorimeter, the temperature rises from 25.87∘c to 38.13∘c. find δerxn for the reaction in kj/mol hexane. the heat capacity of
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What is the final concentration of d at equilibrium if the initial concentrations are [a] = 1.00 m and [b] = 2.00 m ? kc=5.8?
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0 ml of 0.112 m sulfurous acid (h2so3) was titrated with 0.1019 m koh. part a at what added volume of base does the first equivalence point occur?
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If a solution initially contains 0.230 mhc2h3o2, what is the equilibrium concentration of h3o+ at 25 ∘c?
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A current of 5.23 a is passed through a pb(no3)2 solution for 1.40 hours. how much lead is plated out of the solution?
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Assuming the gas is at standard temperature and pressure, how many milliliters make up .073 moles of carbon dioxide?
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What is the empirical formula of a compound containing 24.56% potassium, 34.81% manganese, and 40.50% oxygen? KMnOKMnO2K0.63Mn0.63O2.53KMnO4K3MnO2
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How can the affect of heat on a reaction be determined? A) heat always shifts a reaction toward reactant formation B) heat always shifts a reaction toward product formation C) heat is treated as a rea
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how can you change the polarity of the two atom molecule?
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The structure of the compound or molecule helps predict the name of compound. Given the binary molecule HCl, which statement does not follow the IUPAC nomenclature rules? A) The hydrogen cation indica
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A 2:1:1 mixture of 2-chloro-2-methylpropane (mw: 106.59 g/mol, density 0.866 g/ml, bp 85c), 1-chlorohexane (mw: 120 g/mol, density 0.87 g/ml, bp 133c), and 1-chlorooctane (mw: 148 g/mol, density
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A method used to convert measurements in one unit to their equivalent in a second unit is called the
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