Answers created by Slangus

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• How do you multiply #(3x-2)^2#?
  
• Question #a910e
  
• Question #75b1b
  
• How do the Ka values for weak and strong acids compare?
  
• How are elements classified in the periodic table?
  
• When is the density of water #"1 g/mL"#? How can we measure density?
  
• Where does energy come from in a chemical reaction?
  
• Question #e21bc
  
• Given the reaction:Na2S2O3(aq) + 4Cl2(g) + 5H2O(aq) --> 2NaHSO4(aq) + 8HCl(aq), how many moles of Na2S2O3 are needed to react with 0.12mol of Cl2?
  
• How many moles of #NO_2# are there in #1.81 * 10^24# molecules of #NO_2#?
  
• How do you convert .8333 as a fraction?
  
• What is 32ft/h in yd/day?
  
• Question #e44d4
  
• How much heat is necessary to vaporize 500 g of water at its boiling point?
  
• Question #3266a
  
• How do you measure specific heat?
  
• What is an example of a gas laws practice problem?
  
• How can I find specific heat in thermochemistry of phase of changes?
  
• Question #2b111
  
• Why can't photons be sharply localized?
  
• Question #8dee3
  
• How does an endothermic reaction change the entropy of the surroundings?
  
• Question #06b85
  
• Question #da056
  
• How does changing force or mass affects the acceleration of an object?
  
• How does hydrogen bonding affect the melting point?
  
• An element has 5 protons, 6 neutrons, and 5 electrons. What is the mass number?
  
• What are some examples of acid and base dissociation?
  
• Suppose you are a salesperson for the Acme Dynamite Company. Each month you earn $400 plus one sixth of your sales. What amount must you sell this month to earn more than $3000?
  
• Does an atoms mass number or atomic number ever change?
  
• What is meant by the term “excited state” as it applies to an electron?
  
• You run a 100-yd dash in 9.8 seconds. What is your speed in miles per hour?
  
• How many orbitals are in each of the sublevels (s,p,d,f)?
  
• What are examples of strong acids and bases, weak acids and bases, and neutral substances according to the pH scale?
  
• How does the Bohr's model of the atom explain line-emission spectra?
  
• What is the conjugate acid of ClO4-?
  
• Can you write and balance the equation for the complete combustion of ethane, #C_2H_6#?
  
• How do you find the average atomic mass?
  
• How do you find the height of a tree if the angle of elevation of its top changes from 20 degrees to 40 degrees as the observer advances 23 meters towards the base?
  
• How do you find the measure of angle B for the triangle with the following dimensions. A = 45° , a = 60.5 , b = 90?
  
• How do you simplify #5^3/5^2#?
  
• Question #88c8e
  
• Why is the Hess' law important in physics?
  
• What does the constant R in the Ideal Gas Law mean?
  
• Question #bfee9
  
• What is the electron configuration of fluorine?
  
• Question #c1a9b
  
• Question #19cbb
  
• How does the process of titration work?
  
• A solid rubber stopper has a mass of #33.0# grams and a volume of #30.0# #cm^3#. What is the density of rubber?
  
• How do you write #0.045# in scientific notation?
  
• Question #bd933
  
• How do you solve a triangle given a=10 b=8 B=130 degrees?
  
• Why does a strong acid have a weak conjugate base, whereas a weak acid has a relatively strong conjugate base?
  
• What makes a strong acid strong?
  
• How would you write the formula for sodium perchlorate?
  
• A carpenter is building a stairway. The depth of each tread is 10 inches. The height of each riser is 8 inches. What is the steepness (slope) of the stairway?
  
• What is the conjugate base of HSO4-?
  
• Where do strong acids and bases fall on the pH scale?
  
• What is the specific heat of a material if a 6.0 g sample absorbs 50 J when it is heated from 30°C to 50°C?
  
• How would you balance the following equation: Na2CO3 + BaCl2 --> NaCl + BaCO3?
  
• How do you solve a triangle given a = 8, c = 12, and B = 72?
  
• How would you identify a limiting reagent in a chemical reaction?
  
• How would you balance the following equation: HCI+NaOH --> H2O+NaCI?
  
• Question #f3642
  
• Question #2e118