Daily Chemistry Puzzles & Riddles - Challenge Yourself!

a base mixture is prepared by mixig sodium hydroxide andb barium hydroxide. what is hte ph of the final solutionm prepared by mixing 10ml of 0.025 M naoh with 30ml of 0.025m baoh
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The relationship of absorbed light to the concentration of the substance absorbing the light is governed by ________
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The rate of decay of a radioactive isotope is directly proportional to the amount remaining. If the half-life of the radioactive isotope, Einsteinium, is 276 days and a sample initially weighs 25 grams, what is its rate of decay on the 120th day
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The standard heat of formation for NO2 is 33.2kJmol. How much energy is required to form 100.0 g of NO2 from its respective elements in kilojoules
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The pH of base B is found to be 11.65 and has an initial concentration of 0.033 M. What is the Kb of the base
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The addition of 100 g of a compound to 750 g of CCl4 lowedblue the freezing point of the solvent by 10.5 K. Calculate the molar mass of the compound.
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Suppose we lived in a hypothetical world in which the mass of each proton and each neutron were exactly 1 u. In this world, the atomic mass of copper Cu2963Cu2963 is 62.5 u. What would be the mass defect of this nucleus
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The work functions of four different metals M1, M2, M3, and M4 are 3.1 eV, 3.5 eV, 3.8 eV, and 4.2 eV respectively. Ultraviolet light of energy E shines on all metals, creating photoelectrons. Which metal has the largest stopping potential
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how do you use the temperature of water bath when vaporization begins and the temperature of water bath when water begins to boil to find temperature for ideal gas law
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A scientist is working with 2 compounds. Compound A has a mass of 20.00 amu. Compound B has a mass of 60.00 amu. How will the number of molecules in 5.00g A compare to the number of molecules in 15.00 g of Compound B.
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Nanoscience is the study of A. Phenomena on the scale of 1-100 nm B. Phenomena on the scale of single atoms C. Phenomena on the scale of electrons
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When a beaker containing pure water is connected to a electrodes connected to a light bulb, the light does not illuminate. When a few milliliters of acetic acid is added to the beaker, the light bulb glows dimly. Acetic acid would be considered a(n):
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explain how the N-atom lone pair in the imine influences the experimental 1H-NMR chemical shifts of the 1H-atoms ortho and meta to the N-atom (relative to benzene)
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63.9 mL of 0.560 M sulfuric acid solution was completely neutralized by 28.3 mL of potassium hydroxide solution. What was the concentration of the potassium hydroxide
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For some transformation having kinetics that obey the Avrami equation, the parameter n is known to have a value of 1.5. If the reaction is 25% complete after 125 s, how long (total time) will it take the transformation to go to 90% completion
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Calculate the temperature for which the minimum escape energy is 8 times the average kinetic energy of an oxygen molecule.
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What mass of copper can be plated from a solution containing Cu2 with a current of 3.2 A for 25 minutes
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What do the models you created using the Modeling Tool show? Use the space below to describe the models for each claim.
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The mass of a sample that absorbs 49.6 J of energy when it is heated from 49 degreesC to 54 degreesC and has a specific heat of 0.124 J/g degreesC is ___ grams.
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If we blended all the gasoline sold in WI for transportation with 15.0% ethanol (by volume), what is the acreage needed to supply that much corn ethanol (in acres)
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The compound aluminum chloride is a strong electrolyte. Write the reaction when solid aluminum chloride is put into water.
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10 . Combing your hair leads to excess electrons on the comb. How fast would you have to move the comb up and down to produce red light
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Aerobic degradation (pumping air or hydrogen peroxide into the contaminated site) is also known as ________.
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If the molar extinction coefficient of NADH is 6220 M-1 cm-1, what is the equilibrium concentration of NADH
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