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A mixture is prepared using 25.00 ml of a 0.0828 m weak base (pka = 4.576), 25.00 ml of a 0.0621 m weak acid (pka = 3.230) and 1.00 ml of 0.000107 m hin and then diluting to 100.0 ml, where hin is the
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What is the half-life (in seconds) of a zero-order reaction which has an initial reactant concentration of 0.854 m with a k value of 5.42 × 10–2 m/s?
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A 10 ml sample of HNO3 was diluted to a voulme of 100 ml then 25 ml of that diluted solution were needed to neutralize 50 ml of .60 M KOH what was the concentration of the original HNO3 soulution
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Which molecule would have the highest boiling point? which molecule would have the highest boiling point? ch4 ch3f?
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Another component of acid rain is nitric acid, which forms when NO2, also a pollutant, reacts with oxygen and water according to the simplified equation 4NO2(g)+O2(g)+2H2O(l) → 4HNO3(aq) The generat
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It is estimated that in Florida alone, almost 4,500 deaths occur annually due to __________ use. A. alcohol B. drug C. cocaine D. None of the above
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Carbon monoxide prevents __________. A. the breakdown of other chemicals in the liver B. fuel from igniting at the wrong time C. the blood from carrying oxygen to the tissues of the body D. All of the
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Which of the following is a example of passive nuclear safety inrespo se to failure of electric coolant pumps in a nuclear power plant
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Which of the following statements is true? A. Only objects that are very close together exert gravitational forces on each other. B. Only objects that are as large as planets exert gravitational force
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Which of the following best describes the forces when there are different-sized forces from opposite directions acting on an object
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A radioactive nuclide that is used to label blood platelets has 49 protons and 62 neutrons. Which is the symbol of this nuclide?
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Consider the balanced chemical equation, MgCl2(aq) + 2AgF(aq) → 2AgCl(s) + MgF2(aq) If both reactants are completely consumed and we produce 20 formula units of AgCl, how many ions of Mg and F did w
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This synthesis was designed using the organic chemistry road map found in appendix 11 of your textbook. in this synthesis, reagents from the table are used to carry out the indicated steps (shown in b
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Why was it necessary to reduce the volume of your reaction mixture after the addition of sulfuric acid?
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A key step in the extraction of iron from its ore is feo(s) + co(g) ↔ fe(s) + co2(g) kp = 0.403 at 1000°c. this step occurs in the 700°c to 1200°c zone within a blast furnace. what is the equilib
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A thermometer that was used in a calorimeter was consistently 2.7 °c too high. how would this affect the calculations of δh for the reactions conducted in the calorimeter?
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Write lewis structure that obeys the octet rule for socl2 (s is the central atom) and assign formal charges to each atom.
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Which alkyl bromide reacts fastest with silver nitrate in ethanol: butyl bromide, sec-butyl bromide, or tert-butyl bromide? which reacts slowest? explain how structure affects the rate in the sn1 reac
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How would you explain what happens to the particles during melting and dissolving to someone who is confused
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What idea of Darwin’s based on fossils and the modern organisms he found basically says that genetic changes are inherited by later genes rations
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Study the map and cross section. There are five rock layers shown, A through E. Color each layer a different color. Use the letters in the layers to help you. Sediments are almost always deposited in
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The Earth is split into two parts based on the Equator. What are the names of the two parts? a Southern and Eastern Hemisphere b Eastern and Western Hemisphere c Northern and Southern Hemisphere d Nor
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Help Please! The solubility of a solute depends on A) only the temperature. B) only the nature of the solute. C) the nature of the solute and the temperature. D) neither the nature of the solvent or
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Please help :) 20 points What needs to be done to balance this equation? Remove coefficient 2 in front of H 2O on the right side of the equation. Change O 2 to O 4 on the left side of the equation. Do
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Help Please!! When metals and nonmetals combined, first there is a complete transfer of charge to form cations and anions to complete their valence shell and increase stability. Then _________ bonds a
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Methyl orange is an indicator that changes color over a range from ph=3.1 to ph=4.4. what is ka of methyl orange?
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The body system seen here protects internal structures, provides support, and allows for movement. But this system does not work alone. In order for humans to move, this system must work together with
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Write the formula of the conjugate base of CH3COOH. Click in the answer box to activate the palette.
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A chemist mixes 500 g of lead at 500°C with 1,200 g of water at 20°C. She then mixes 500 g of copper at 500°C with 1,200 g of water at 20°C. The specific heat capacity of lead is 0.1276 J/g°C and
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Based on the graphs below, which of the following substances has the highest specific heat capacity? Assume each experiment began with 200 g of the substance at 100°C mixed with 500 g of water at 20
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A solid sample of Fe(OH)2 is added to 450.0 mL of 0.550 M aqueous HCl. The resulting solution is acidic. It takes 95.0 mL of 0.500 M NaOH solution to neutralize the solution. Answer the following qu
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In solid NaCl, each sodium ion is surrounded by six chlorine ions and each chlorine ion is surrounded by six sodium ions. This arrangement results in a
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Like several other bonds, carbon-oxygen bonds have lengths and strengths that depend on the bond order. Draw Lewis structures for the following species, and arrange them in order of increasing carbon-
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If you have 3.50 moles of hydrogen and 5.00 moles of nitrogen to produce ammonia, which element is the reactant in excess? 3H2 + N2 → 2NH3
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Approximately how long will the circuit oscillate? express your answer to three significant figures and include the appropriate units.
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The complete combustion of 0.661 g of a snack bar in a calorimeter (Ccal = 6.15 kJ/°C) raises the temperature of the calorimeter by 1.63 °C. Calculate the food value (in Cal/g) for the snack bar.
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How many grams of ethylene glycol (c2h6o2) must be added to 1.05 kg of water to produce a solution that’s freezes at -3.68 degrees Celsius
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Acetylene gas can be prepared by the reaction of CaC2 and Water CaC2 + 2H2O ----> Ca(OH)2 + C2H2 Calculate the volume of the C2H2 that is collected over water at 23C by the reaction of 1.524g of CaC2.
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Scientists are studying fertilizers to help grass grow in southern California. Fertilizer is any substance that can be added to soil to help plants grow in it. In other words, fertilizer makes soil mo
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Can someone help me with finding the T#D's, BD's and NBD's I don't understand how to do it can someone please help me.
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If 1495 J of heat is needed to raise the temperature of a 342 g sample of a metal from 55.0°C to 66.0°C, what is the specific heat capacity of the metal?
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Based on its location on the periodic table, which metal is likely to be less reactive than both strontium and sodium? magnesium (Mg) barium (Ba) cesium (Cs) rubidium (Rb)
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A gas is found to be 85.7% carbon and 14.3% hydrogen by mass its molecular mass was found to be 98.1 g per mole using the method of this experiment what is the molecular formula of this gas
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How can an increase in biodiversity lead to an increase in ecosystem stability? a. A more biodiverse ecosystem is not subject to change. b. A more biodiverse ecosystem has a higher chance of adapting
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What is the molar mass of an unknown gas in a 1.50L container if 0.498 g of the gas has a pressure of 0.0765 atm at 25 c?
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In the process, about 35 molecules of atp are generated per molecule of glucose oxidized, so that some of the energy released by oxidation is recovered as usable chemical energy. the principal role of
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A hybrid orbitals that has greater s-character is more likely to posses, (a) higher ionization energy, (b) all of the above (c) greater electronegativity, (d) low electronegativity
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Please read articlefirst and fill up the next page.
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For the reaction calculate how many moles of the product form when 0.036 mol of o2 completely reacts
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If we titrate 10.00 ml of a .200 M HCl solution with NaOH, we find it requires 19.87 ml to reach the end point. Write the equation and calculate the experimental molarity of the NaOH base.
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