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How much heat must be added to 0.45 kg of aluminum to change it from a solid at 130 8c to a liquid at 660 8c (its melting point)? the latent heat of fusion for aluminum is 4.0 3 10 5 j/kg?
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Determine the concentrations of k2so4, k , and so42– in a solution prepared by dissolving 2.77 × 10–4 g k2so4 in 1.50 l of water. express all three concentrations in molarity. additionally, expre
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Calculate the percent ionization of a 0.75 molar solution of acetic acid. the ionization constant of acetic acid is 1.8 × 10−5 .
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A system gains 752 kj of heat, resulting in a change in internal energy of the system equal to 196 kj. how much work is done?
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94 a 3.27 3 m tank contains 100kg of nitrogen at 175k. determine the pressure in the tank, using (a) the ideal-gas equation,
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Experimental Procedure, Part A.1. For preparing a set of standard solutions of FeNCS2, the equilibrium molar concentration of FeNCS2 is assumed to equal the initial molar concentration of the SCN in t
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The bond energy for C -Cl is 397 Kj/mol and for C-Br is 280Kj/mol. Which bond length do you predict would be the shortest
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1.How many alleles are used to represent a particular trait? 2.Widow’s peak is a dominant trait and is represented with a capital “W”. Straight hairline is a recessive trait and is represented
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A tire has a pressure of 325 kPa at 10°C. If the temperature of the tire rises to 50°C and the volume remains constant, what is the new pressure? ( Hint:°C + 273 = K.)
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Pls, help Which process turns glucose into energy? Breathing Cell division Cellular respiration Photosynthesis
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What needs to happen for the equation CH4 + O2 CO2 + H2O to be balanced? A. Nothing, the equation is already balanced. B. A coefficient of 2 must be added before both products and reactants. C. A coef
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What is a sample statistic? a correct: your answer is correct. descriptive measure of a correct: your answer is correct. . give examples. (select all that apply.) demo?
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Consider the reaction 4PH3(g) → P4(g) + 6H2(g) Suppose that, at a particular moment during the reaction, molecular hydrogen is being formed at rate of 0.240 M/s. (a) At what rate is P4 changing? M/s
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What mass, in grams, of fluorine gas (F2) is contained in a 8.3-liter tank at 29.8 degrees Celsius and 1.23 atmospheres? Show all of the work used to solve this problem.
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When two atoms of different elements come in contact, heat is given off and light is produced. Which of the following does this support?
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Profe Dejanras Ayuda Ejercicio de química Ayuda por favor con procedimiento y solución. Bendiciones
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By adding a tablespoon of salt to gatorade, does it change it to a hypotonic, isotonic ,or hypertonic solution.
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In this experiment, 1.0 ml of saturated sodium chloride is used to rinse the hickman head after the initial distillation. why is saturated sodium chloride, rather than pure water, used for this proced
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A 3.228 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 8.349 grams of CO2 and 1.709 grams of H2O are produced. In a separate experiment, the molar mas
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A gas has an initial volume of 454 mL at 103 ºC and a final volume of 234 mL. What is its final temperature in degrees Celsius?
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A 0.477 mol sample of O2 gas has a volume of 12.1 L at a certain temperature and pressure. If all this O2 were converted to ozone (O3 ) at the same temperature and pressure, what is the ozo
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What is the relationship between variable x and variable y? As variable x increases, variable y increases. As variable x increases, variable y decreases. Both variables show a trend toward decreasing
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How do we solve ths: a mixture consists of feso4 and fe2(so4)3. A 0.1223g sample of this mixture was dissolved in water and titrated with a 0.00420 M KMnO4 solution. The titration required 18.85 ml of
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how can I use the absorption and wavelength spectrums of copper and brass to show that there are other elements besided copper in a brass sample
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What would be the resulting molarity of a solution made by dissolving 31.3 grams of Ca(OH)2 in enough water to make a 1059 milliliter solution
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If the solubility of gas us 7.5 lg/l at 404 up a what is the solubility of gas when the pressure is 202kpa
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Consider the hydrocarbon below. H H \ / C===C / \ H H What is the name of this hydrocarbon? propene pentene butene ethene
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What is the minimum mass of nh4hs that must be added to the 5.00-l flask when charged with the 0.250 g of pure h2s(g), at 25 ∘c to achieve equilibrium?
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The solubility of n2 in blood can be a serious problem (the "bends") for divers breathing compressed air (78% n2 by volume) at depths greater than 50 ft. find the volume (in ml) of n2, measured at 25
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Menthol is a crystalline substance with a peppermint taste and odor. when 0.579 g of menthol is dissolved in 25.0 g of cyclohexane, the freezing point of the solution is lowered by 3.09 °c. the fre
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For an aqueous solution of hf, determine the van't hoff factor assuming 0% and 100% ionization, respectively. a solution is made by dissolving 0.0100 mol hf in enough water to make 1.00 l of solution.
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Calculate the vapor pressure of a solution of 0.37 mol of cholesterol in 6.0 mol of toluene at 32°c. pure toluene has a vapor pressure of 41 torr at 32°c.
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When an ionic bond forms between lithium (Li) and fluorine (F), which of the following occurs? F loses one electron. F loses two electrons. F gains one electron. F and Li share electrons.
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Which of the following pair of elements could possibly be in the same group? X has a 1+ ion; Y has a 1- ion. X has an atomic number 15; Y forms a 3- ion. X tends to form a 2+ ion; Y tends to gain two
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Which subatomic particle is involved in chemical bonding and is responsible for an element's reactivity? proton neutron electron ion
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What do all isotopes of the same element have in common? atomic mass chemical stability number of neutrons number of protons
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What are the molality and mole fraction of solute in a 35.5 percent by mass aqueous solution of formic acid (HCOOH)?
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Which of the following quantum number combinations is not allowed in a ground-state atom? (2, 1, 1, -½) (8, 7, -7, +½) (5, 5, -5, +½) (1, 0, 0, +½)
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Jimmy is working on his science project: an erupting volcano. He decided to use vinegar and baking soda for the eruption reaction. He tested it over and over and was extremely pleased with the results
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1. Explain why copper possesses a high electrical conductivity. 2. Explain why NBr3 and CBr4 can have the same steric number but different molecular geometries. Be sure to identify the steric number a
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Why does oil prolong the life of car parts? a. It reduces wear due to friction c. It creates more momentum in the engine b. It protects them from dirt d. It helps to increase the mass of the engine
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PLZ HELP ME I NEED HELP ASP I WILL GIVE U BRAINLEST!!!!!!!!!!!!!!!! What happens to hot water beneath the earth as it moves up through fractured rock? A. It turns very cold. B. It circulates back dow
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Help me please quick!!!!!1 Complete the questions Remember to use complete sentences in paragraph form. 1. Explain three ways that studying seismic waves can help scientists learn about Earth's interi
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A sample of nitrogen gas occupie s1.55 liters at 27.0 celsius and 1.oo atm pressure. what will the volume be at -100 celsius and the same pressure
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A gas is placed in a container with a movable piston. What happens to the pressure of the gas if the piston reduces the volume of the container by a factor one-half? a) The pressure will be reduced by
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A liquid has a volume of 2.50 L and mass of 3150 g find density in g/ml. With the answer with correct significant figures.
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KE= 1/2 MV-TO THE SECOND POWER and CPE=MGH In both equations, m stands for mass and needs to be measured in kilograms (kg). The speed is shown by v and is measured in (m/s). The height is h and is mea
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Tanks of compressed gas must be kept away from heat sources if I compressed gas tank is he too much it makes protocols a great deal of damage which of the following best explains why compressed gas to
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Describe the ammonium ion, NH4+, and the sulfate ion, SO42-. What compounds would these ions form with potassium and fluoride ions? Write the formula units for the resulting compounds.
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How many moles of nitrogen are formed when 58.6g of KNO3 decomposes according to the following reaction? The molar mass of KNO3 is 101.11g/mol
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