Chemistry

Given a list of 10,000 elements, and if each comparison takes 2 s, what is the fastest possible runtime for linear search?
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The density of mercury is 13.6 g/cm3 . What volume (in quarts) is occupied by 100. g of Hg? (1 L = 1.06 qt)
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19. Which of the following best describes the role of the spark from the spark plug in an automobile engine?(A) The spark decreases the energy of activation for the slow step.(B) The spark increases the concentration of the volatile reactant.(C) The spark supplies some of the energy of activation for the combustion reaction.(D) The spark provides a more favorable activated complex for the combustion reaction.(E) The spark provides the heat of vaporization for the volatile hydrocarbon.
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because the light rays never meet, a concave lens can produce
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A uniform, solid, 1100.0 kg sphere has a radius of 5.00 m. Find the gravitational force this sphere exerts on a 2.40 kgkg point mass placed at the following distances from the center of the sphere: (a) 5.01 mm , and (b) 2.50 mm .
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Boston, MA and Barcelona, Spain have very similar latitudes (they are both a similar distance from the equator.) Why is the climate of Boston so different from the climate of Barcelona?
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Calculate the heat needed to change 3.00 * 10^2 grams of water at 25 degrees celsius to steam at 100 degrees celsius
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How many electrons can copper lend?
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A buffer solution is made by mixing a weak acid with its conjugate base. If the ratio of conjugate base to acid is 4, and the pH of the buffer is 7.2, what is the pKa of the weak acid? Round the answer to one decimal place.
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Data has been collected to show that at a given wavelength in a 1 cm pathlength cell, Beer's Law for the absorbance of Co2 is linear. If a 0.135 M solution of Co2 has an absorbance of 0.350, what is the concentration of a solution with an absorbance of 0.420?
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Why is liquid silver less dense than solid silver
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Summarize the trend in metallic character as a function of position in the periodic table. Is it the same as the trend in atomic size? Ionization energy?
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If a buffer solution is 0.250 M 0.250 M in a weak base ( K b = 8.0 10 5 ) Kb=8.0105) and 0.540 M 0.540 M in its conjugate acid, what is the pH ?
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According to the Bohr model of the atom, when an electron goes from a higher-energy orbit to a lower-energy orbit, it ________ electromagnetic energy with an energy that is equal to the ________ between the two orbits.
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he decomposition of acetaldehyde, CH3CHO, was determined to be a second order reaction with a rate constant of 0.0771 M-1 s-1. If the initial concentration of acetaldehyde is 0.358 M , what will the concentration be after selected reaction times
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How do you do a stoichiometric problem
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The vapor pressure of cobalt is 400 mm Hg at 3.03x10^3 K. Assuming that its molar heat of vaporization is constant at 450 kJ/mol, the vapor pressure of liquid Co is _____ mm Hg at a temperature of 3.07x10^3 K.
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It took 38.33 mL of 0.0944 M HCl to titrate (react completely with) the ammonia. What is the concentration of the original ammonia solution?
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The following equation lnN - N = -kt Of time t is plotted on x-axis and lnN is plotted on y-axis, what are the slopes and y-intercept algebraically? Hint: lnN = lnN - LnN
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Silver Mining is opening a new mineral extraction facility in the local town and will employ several thousand people. They have decided to install scrubbers on the smokestacks of their facility in order to protect the environment, even though they are not required by the law to install them. This is an example of:Business ethical behaviorLegal Behavior
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How do water molecules dissolve a salt?OA. The water molecules move around the salt crystals.OB. The water molecules separate the crystals into molecules.OC. The water molecules move around the salt ions.D. The salt crystals squeeze in between water molecules.
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Given that a chlorine-oxygen bond in ClO2(g) has an enthalpy of 243 kJ/molkJ/mol , an oxygen-oxygen bond has an enthalpy of 498 kJ/molkJ/mol , and the standard enthalpy of formation of ClO2(g) is? Hf=102.5kJ/molHf=102.5kJ/mol , use Hess's law to calculate the value for the enthalpy of formation per mole of ClO(g).
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Which sequence of events is required to form a limestone cave where you can walk around and observe cave formations, such as stalactites?
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How many moles of oxygen are needed to react with 23.8 moles of aluminum?
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