Answers created by Dr. Hayek
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Question #cc55e
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The activation energy of a certain reaction is 35.3 kJ/mol. At 20 degrees C, the rate constant is #0.0130 s^-1#. At what temperature would this reaction go twice as fast?
please help?
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According to the Arrhenius equation, how does temperature affect the rate constant?
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Question #f4a99
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How does a salt bridge improve a battery?
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What is the Arrhenius equation and what is meant by activation energy?
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What is the name of the compound #Ca(NO_3)_2#?
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The amount of heat needed to raise the temperature of 25 g or a substance by 15°C is 915 J. What is the specific heat of the substance?
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What is the main difference between Bohr's model of the atom and the atomic theory that is currently accepted?
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What are some examples of stoichiometry with acid and base dissociation?
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A student adds 5.00 g of dry ice (solid #CO_2#) to an empty balloon. What will be the volume of the balloon at STP after all the dry ice sublimes (converts to gaseous #CO_2#)?
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According to the VSEPR theory, what is the molecular shape of #CO_2#?
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A 12.0 L sample of gas is at STP. What would be its new volume if its pressure was decreased to 575 mmHg and its temperature was doubled?
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How can rates of reactions be measured?
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Question #605aa
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Calorimetry is based on what basic concepts?
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An atom has a valence shell electron configuration of #ns^1#. To which group of elements in the periodic table does it belong?
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What is the #[H^+]# in a solution that has a pH of 3.35?
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Question #72788
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An excess of hydrogen reacts with 14.0 g of #N_2#. What volume of ammonia will be produced at STP?
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What is the molarity of a solution with 0.2 moles of potassium permanganate (#KMnO_4#) dissolved in enough water to make a 500.0 mL solution?
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What is the Arrhenius equation?
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Question #93cb7
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What is the relationship between enthalpy and entropy?
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Diamonds and graphite are two forms of what nonmetal?
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What defines an acid and base?
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How many kilograms of solvent are there in a sample of 0.30 molal solution if the sample contains 13 moles of solute?
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When is the Arrhenius equation used?
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The laser in an audio compact disc player uses light with a wavelength of #7.8 * 10^2# #nm#. What is the frequency of this light?
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How do you rearrange Arrhenius equation for activation energy?
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What is the electron configuration of an element with atomic number 20?
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What is an acid? What is a base?
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Question #a0330
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Of the 3 states of matter, solid, liquid, and gas, which has the lowest kinetic energy for a given substance?
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How many atoms are in 15.0 of silver?
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If a buffer made by dissolving 20.0 g of sodium benzoate (144g/mol) and 10 grams of benzoic acid (122g/mol) in water to a final volume of 500.0 ml, what is the pH of the buffer?
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What is the average atomic mass for the mixture that is 75% #""^133Cs#, 20% #""^132Cs#, 5% #""^134Cs#?
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How many grams are contained in 2.22 moles of sucrose #C_12H_22O_11#?
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How many formula units are in 0.175 mole of ammonium sulfate?
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If a gas sample has a pressure of 30.7 kPa at 0.00°C, by how much does the temperature have to decrease to lower the pressure to 28.4 kPa?
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Question #d09d7
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Question #a3360
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How many milliliters of .015 M #NaOH# are needed to neutralize 50.0 mL of 0.010 M #HNO_3# (aq)? What compounds are formed after the reaction is complete?
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What do electron affinity values mean?
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What is 737 mmHg converted to atmospheres?
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At what Kelvin temperature will a sample of gas occupy 12 liters if the same sample occupies 8 liters at 27 ℃?
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What is the molecular shape of phosphorus trichloride (#PCl_3#)? What are the bond angles in this molecule?
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What are some examples of free energy?
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Question #1cf30
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How many grams of silver chloride are produced from 5.0 g of silver nitrate reacting with an excess of barium chloride in the reaction #2AgNO_3 + BaCl_2 -> 2AgCl + Ba(NO_3)_2#?
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If 5.49 mol of ethane (#C_2H_6#) undergoes combustion according to the unbalanced equation #C_2H_6+O_2->CO_2+H_2O#, how much oxygen is required?
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What would happen if #O_2# were added to #N_2(g) + O_2 (g) rightleftharpoons 2NO(g)# at equilibrium?
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What pressure is exerted by 0.450 mol of a gas at 25 degrees Celsius if the gas is in a 0.50 L container?
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Question #44c0d
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Why does heat capacity change with temperature?
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How many molecules of #NH_3# are produced from #4.82*10^-4# #g# of #H_2#?
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Why doesn't #CO_2# melt if you leave it out in the open?
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Question #961df
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How many moles are necessary to react completely with four moles of propane in the reaction #C_3H_8 + 5O_2 -> 3CO_2 + 4H_2O#?
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Does a reducing agent in a redox reaction gets reduced or oxidized?
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Why are electrons shared equally in oxygen, #O_2# but not in carbon monoxide #CO#?
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Question #81fec
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What is the energy transfer when you touch a block of ice with your hand?
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What is the density of a wood block with a mass of #57# #g# and a volume of #125# #cm^3#?
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Question #08ad0
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Question #48ecb
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In a titration with a strong acid and weak base, where is the equivalence point?
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How do you balance #NaClO_3 -> NaCl + O_2#?
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Question #dbb08
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What is a simple definition of entropy and how does it relate to chaos theory?
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How many moles of #N_2# are formed by the decomposition of 2.5 moles of #NaN_3#?
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What kind pressure units are used for the gas laws?
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Will an object with a density of #.7# #g##/cm^3# float or sink in water?
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How does surface area affect the Van der Waals interactions?
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The absorbance of #2# x #10^-4# #M# solution was found to be #0.123# when placed in a cell of #1# #cm# length. Calculate the transmittance, percent transmittance and molar absorptivity of a cell of length #2# #cm#?
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Question #796e9
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Question #145f0
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How does the temperature affect the amount of gas dissolved?
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Question #1f3e8
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How do you write the total ionic equation and net ionic equation for the reaction of silver nitrate and potassium chloride?
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What is the percentage composition of #CF_4#?
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1.68 moles of #NaCl# (table salt) contains how many molecules?
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What two things increase the solubility of a gas in a liquid?
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What happens to the average kinetic energy of water molecules as water freezes?
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What is the Nernst equation?
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Why are strong acids and bases also strong electrolytes?
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How would you define the concept of equilibrium in terms of free energy and entropy?
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When do you use Henry's law and when do you use Raoult's law?
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Since #C Cl_4# is made up of one carbon and four chlorine atoms, how many total valence electrons does #C Cl_4# have?
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A gas takes up a volume of 19.5 liters, has a pressure of 2.9 atm, and a temperature of 5.5°C. If I raise the temperature to 65°C and lower the pressure to 1.5 atm, what is the new volume of the gas?
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What is the formula mass of sodium chloride?
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What is the relationship between density and molecular weight of a substance?
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Does specific heat change with molarity?
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Calculate #pH# of #10^-9# #M# #NaOH#?
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How do electrolysis apparatus work?
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Why is #Delta G# negative for electrolysis reactions?
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A sample of gas has a volume of 425 mL at 25°C and 760 torr. What volume would this gas sample have at STP?
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Which transition metals have fixed charges?
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HCl ,CH3COOH, HNO2,NH3,KOH, pyridine. Write as many salts formula. For each salt,write chemical equation when salt dissolved in water. Is the solution acidic neutral or basic ?
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What energy level and shape of orbital would you expect the two electrons of helium to be in the ground state?
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