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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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Potassium superoxide (KO2, 71.10 g/mol) can be used to generate oxygen gas. What is the theoretical yield of O2 (32.00 g/mol) if 500.0 g KO2 reacts with excess H2O (18.02 g/mol)?
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If someone you know is very sensitive to acid foods, which foods would you recommend he or she avoid?
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What is the balanced redox equation that results from the combination of the following half reactions
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How many grams of solid sodium carbonate (Na2CO3, 106 g/mol) would be required to neutralize 1.0L of 1.0 M HCL
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Balance the following equation. Then determine the ratio for the products KCl and O2 generated during the decomposition of potassium chlorate. KClO3 KCl + O2 1:1 2:2 4:3 2:3 3:2
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If 18.16g of nacl is diluted to 200.0ml in a volumetric flask, what is the concentration of the solution in %w/v
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How many grams of iron (III) chloride must decompose to produce 78.4 milliliters of iron metal, if the density of iron is 7.87 g/mL? Show all steps of your calculation as well as the final answer. FeC
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A pendulum has 543 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom of its swing?
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When heated, calcium carbonate decomposes to yield calcium oxide and carbon dioxide gas via the reaction caco3(s)→cao(s)+co2(g) how many grams of calcium carbonate are needed to produce 61.0 l of ca
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What is the molarity of a 38.5% (v/v) aqueous ethanol solution? the density of ethanol (c2h6o, molar mass 46.07 g/mol) is 0.790 g/ml?
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Hydrogen gas is produced when zinc reacts with sulfuric acid. zn(s) + h2so4(aq) → znso4(aq) + h2(g) if 157 ml of wet h2 is collected over water at 24°c and a barometric pressure of 740. torr, how m
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A nail driven into a board increases in temperature. if we assume that 60% of the kinetic energy delivered by a 2.10-kg hammer with a speed of 7.90 m/s is transformed into heat that flows into the nai
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How do you expalin the relativity high conductivity of tap water compared to a low o zero conductivity for distilled water
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A student did not fill the tip of the buret with titrant before starting the NaOH standardization so the tip contained air when the titration was started
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Molecule with central atom surrounded by 3 single bond pairs and 1 unshared pair would have what shape
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Why is it important to have the correct bond angles of the different atoms and the shape of the molecule?
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In each reaction box, place the best reagent and conditions from the list below. (a reagent may be used more than once.)
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An electrochemical cell is constructed such that on one side a pure zn electrode is in contact with a solution containing zn2 ions at a concentration of 102 m. the other cell half consists of a pure p
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Give another example of a scientific investigation that would require both observations and experiments
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Draw fischer projection formulas for the products likely to be obtained from the bromination of (z)-2-hexene with br2/dichloromethane. identify the chiral centers with asterisks and label each center
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What concentration of fe3+ is required to begin precipitation of fe(oh)3 if the ph of the solution is 3.48? ksp of fe(oh)3 is 2.79x10-39?
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