Answers created by Dr. Hayek

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• What is entropy the measure of?
  
• Question #bfe80
  
• What is ionization energy and how does this term relate with reducing property of metals and its trend across a period or down a group?
  
• What are ionization energy and electron affinity?
  
• What is a buffer in chemistry?
  
• A sample of gas occupies a volume of 70.9 mL. As it expands, it does 118.9 J of work on its surroundings at a constant pressure of 783 torr. What is the final volume of the gas?
  
• Question #e2639
  
• In the reaction #B + K leftrightarrow L + H#, if an additional B is added, what will be the result?
  
• In the battery, or voltaic cell, electrons are transferred from one electrode to the other. What is the electrode that gains electrons?
  
• What is the result of using a catalyst in a chemical reaction?
  
• Question #3ae78
  
• What is the pOH of a #8.4x10^-11 M# #OH^-# solution?
  
• What is electroplating?
  
• The electrolysis of water into hydrogen and oxygen is an example of what reaction?
  
• At room temperature, what phase is carbon dioxide in?
  
• The first shell of any atom can contain up to how many electrons?
  
• What is the name of the family that is stable and rarely combines with other elements since their outer energy level of electrons is full?
  
• Using the rules for significant figures, what do you get when you multiply 67.6 by 1.2?
  
• If 40.0 mL of a #3.0x10^(-5)# solution is diluted to 100 mL, what is the resulting concentration?
  
• How do you round 65.145 meters to three significant figures?
  
• How would you define diffusion in terms of the particles of a gas?
  
• What is the term that means metals can be hammered into thin sheets (such as aluminum foil)?
  
• How do you graph Le Chatelier's principle?
  
• What is the Ka of a strong acid like HCl?
  
• What is the voltage of a galvanic cell made with zinc and aluminum at standard conditions?
  
• How do you calculate Keq?
  
• How would you use #NaHCO_3# and #H_2CO_3# (a buffer sometimes added to swimming pools) to explain how buffers work?
  
• What is the empirical formula for the product that is formed when #K# and #Cl_2# combine?
  
• How do you calculate Keq from pKa?
  
• How do you find volume in a titration question?
  
• Question #9698a
  
• Question #37a30
  
• When aqueous solutions of HCI and NaOH are mixed together in a calorimeter, the temperature of the solution increases. What type of reaction is this?
  
• How do you find the equilibrium constant for the reverse reaction of this problem?
  
• Gas X has a mass of 28.02 amu and gas Y has a mass of 32 amu. Which gas will diffuse faster?
  
• When the following equation is balanced, #K(s) + H_2O(l) -> KOH(aq) + H_2(g)#, what is the coefficient of #H_2#?
  
• What drives a galvanic cell?
  
• How do you find the rate determining step from a graph?
  
• Why does a concentration cell work?
  
• What is the balanced molecular, ionic, and net ionic equation for: Solutions of acetic acid and sodium nitrite are mixed.?
  
• For s, p, d, and f orbitals, how many electrons can each hold?
  
• What is a conclusion in the scientific method?
  
• Question #516aa
  
• Question #4e131
  
• How many valence electrons do group one have?
  
• How can Van der Waals forces be used to determine relative boiling point?
  
• What is the specific heat of ice at 0 degrees Celsius?
  
• How do you do titration problems to find molarity?
  
• Impure metal should be made the anode and pure metal should be made the cathode. Why would the anode corrode and become thinner?
  
• If you needed to make ultrapure silver from crude silver, where would you collect the pure silver metal in an electrolytic cell?
  
• Question #d0cfc
  
• How would you explain collision theory?
  
• Why do electrochemical cells need a salt bridge?
  
• Question #2bae1
  
• Question #457ca
  
• Question #4b91e
  
• How do you solve titration problems?
  
• Why do strongly-dissociating acids conduct electricity?
  
• What is the pH of a #6.2 * 10^-3# M solution of #HF#?
  
• Question #f6709
  
• If it takes 41.72 joules to heat a piece of gold weighing 18.69 g from 10.0°C to 27.0°C, what is the specific heat of the gold?
  
• How do you calculate molecular weight of a gas?
  
• Question #e6bb7
  
• How do you calculate the pH at the equivalence point for the titration of .190M methylamine with .190M HCl? The Kb of methylamine is 5.0x10^-4.
  
• What definition best explains collision theory?
  
• What are Arrhenius bases?
  
• Question #6f85b
  
• A gas has a volume of 300 mL at 300 mm Hg. What will its volume be if the pressure is changed to 500 mm Hg?
  
• What is the oxidation number of #Sn# in the compound #Na_2SnO_2#?
  
• What is the molar concentration of sulfate ions in a 0.150 M #Na_2SO_4# solution?
  
• If 98.5 mol of an ideal gas is at 1.73 atm and 477 K, what is the volume of the gas?
  
• Question #e42d6
  
• What do Van der Waals forces do?
  
• Question #24ab3
  
• How many significant digits are in #50.00#?
  
• The decomposition of #H_2O_2# produces water and oxygen gas, releasing 197 kJ per one mole of #H_2O_2#. How much energy is released if we start with 798 grams of #H_2O_2#?
  
• What are indications that a chemical reaction has occurred?
  
• What are weak chemical bonds that form between polar molecules called?
  
• What are elements found on the left side of the periodic table called?
  
• How does an acid-base buffer system function?
  
• What is the specific heat capacity of a 50-gram piece of 100°C metal that will change 400 grams of 20°C water to 22°C?
  
• What is the difference in conductivity between the 0.001 M sodium chloride and the 0.001 M ferric chloride?
  
• A flask contains methane, chlorine, and carbon monoxide gases. The partial pressures of each are 0.215 atm, 50 torr, and 0.826 respectively. What is the total pressure in the flask?
  
• What is the density of carbon dioxide at STP?
  
• How do you calculate PKa using the Henderson-Hasselbalch equation?
  
• What volume of #O_2# at 912 mmHg and 21° C is required to synthesize 18.0 mol of #NO#?
  
• What is an acid?
  
• How can I solve the Nernst equation?
  
• Question #598b1
  
• For a certain reaction #2A + B rightleftharpoons C + 3D#, #K_(eq) = 4.2 xx 10^3#, which of the following is true?
  
• What is the definition of entropy?
  
• How does a catalyst affect collision theory?
  
• How do you calculate the pOH of HCl?
  
• What happens in a galvanic cell?
  
• Question #b85cd
  
• How do you find pOH given pH?
  
• An aqueous solution has a hydronium ion concentration of #6 * 10^-9# mole per liter at 25°C. What is its pH?
  
• How do you explain what a Van der Waals force is?
  
• What type of attractive force must be overcome in order to melt the following in their solid state?
  
• What is the volume of 36.8 g of carbon monoxide at STP?
  
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