Answers created by Owen Bell

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• Why is this statement false: "If 10 grams of propane burn, you need 50 grams of oxygen."?
  
• Question #f2baa
  
• Question #d24f9
  
• The IE of H is 1.31 MJ/mole. If all three electrons in Li were in the 1st shell at a distance equal to that of H, which of the following values would be the better estimate of the first ionization energy of Lithium: 3.6 MJ/mole or 0.6 MJ/mole? Why?
  
• Question #82e8d
  
• If someone says you're wont to buy flowers, what does he or she mean?
  
• Where are atoms that tend to gain electrons located in the periodic table of the elements?
  
• What is an isothermal process with an example?
  
• Question #a8780
  
• Is NF3 an acid or a base?
  
• What conditions are present to determine whether a reaction will be sn1 or sn2?
  
• How many pi bonds are in #SO_2#?
  
• What English helping verb is always used to translate the pluperfect tense?
  
• What is the mass percent of carbon in propanoic acid #(C_2H_5COOH)#?
  
• According to the VSEPR theory, a molecule with the molecular formula of #A_2# has what shape?
  
• Question #73f32
  
• Why is Hess' law useful to calculate enthalpies?
  
• What is the balanced net ionic equation for #H_3PO_4(aq) + Ca(OH)_2(aq) -> Ca_3(PO_4)_2(aq) + H_2O(l)#?
  
• Question #578d1
  
• Question #45625
  
• Question #9b9c9
  
• What is the molecular formula of a compound with a mass of 180 grams and an empirical formula of #CH_2O#?
  
• What is the formula for sodium nitride?
  
• In the formula #H_2O_2 -> H_2O + O_2#, how many grams of #O_2# are produced from the decomposition of 68 g of #H_2O_2#?
  
• How would you know if an element is an isotope?
  
• What is the molar mass of #K#?
  
• What is the most common isotope of chlorine?
  
• How do you find the slope and intercept of #y=2/3x+4#?
  
• What is the electron configuration for a chloride ion?
  
• Question #ea867
  
• If the diameter of a circle is 20cm, what is the area?
  
• What are the intermolecular forces of CHF3, OF2, HF, and CF4?
  
• A compound contains 40% calcium, 12% carbon, and 48% oxygen by mass. What is the empirical formula of this compound?
  
• What is the difference between standard enthalpy of combustion and standard enthalpy of formation?
  
• How are alkyl groups electron donating?
  
• How many individual atoms make up one unit of aluminum chloride, #AlCl_3#?
  
• You need to construct a regular polygon. When you draw two sides, the interior angle created between them is 120°. What will be the sum, in degrees, of the measures of the interior angles of this polygon when it is completed?
  
• What is the distance between # (–2, 1, 3) # and #(8, 6, 0) #?
  
• What is the molecular weight of the acetic acid #(CH_3CO_2H)#, rounded to the nearest integer?
  
• Is electric charge a physical property of matter?
  
• Is there a way to "disable" graphs from auto-updating when writing an answer?
  
• Samantha ran 5 miles in 42 minutes. Meghan ran 8 miles in 68 minutes. Who has a faster speed in minutes per mile?
  
• What is the volume of #H_2# generated by reacting 4.33g of #Zn# with excess #H_2SO_4# at 38°C and 760 torr?
  
• An ideal gas has a volume of 2.28 L at 279 K and 1.07 atm. What is the pressure when the volume is 1.03 L and the temperature is 307 K?
  
• How do you solve for y in #9-y=1.5x#?
  
• How do valence electrons relate to the periodic table?
  
• What element has an electron notation #(Kr)5s^(2)4d^(10)5p^2#?
  
• Do any of the following compounds exhibit london dispersion forces: CO, NH3, CO2, CH4, and H2?
  
• Question #76404
  
• How do ionization energy and electron affinity determine whether atoms of elements will combine to form ionic compounds?
  
• Gallium has two naturally occurring isotopes. The mass of gallium-69 is 68.9256 amu and it is 60.108% abundant. The mass of gallium-71 is 70.9247 amu and it is 39.892% abundant. What is the atomic mass of gallium?
  
• What is the distance between #(8, 2) # and # (4, -5) #?
  
• Mr. Jacobs is 4 times as old as his son. Five years ago, he was was 9 times as old as his son. What is Mr. Jacob's age?
  
• What allows gravity to pull in on things without using energy?
  
• Does hydrogen bonding have a directional character?
  
• Jennifer works in a music store and earns 8.2% commission on each sale. If Jennifer sells a tuba and earns $125.25, what is the price of the tuba?
  
• How would you explain the difference between van der Waals interactions and hydrophobic interactions?
  
• How does temperature affect the dissociation constant?
  
• What does resonance mean in chemistry?
  
• What is the conductivity of salts?
  
• What is the difference between a chemical symbol and a chemical formula?
  
• Which of the following is Lewis base: AlCl3, CO, CO2, or BF3?
  
• Lead (II) nitrate reacts with potassium iodide to form lead (II) iodide and potassium nitrate. How do you write the balanced equation for this?
  
• Can I make a hexagon with 3 right angles?
  
• What happens to atoms during chemical reactions?
  
• The half-life of the decay of radioactive cesium(134) has been reported to be 2.062 years. What fraction of the original radioactivity will remain after 67 months?
  
• Question #d6b39
  
• Why is the kelvin scale used for gas laws?
  
• Why are neutrons heavier than protons?
  
• How do you write "calcium + nitrogen -> calcium nitride"?
  
• What is the variance of the following numbers?: 63, 54, 62, 59, 52,
  
• What is a quadrilateral that is not a parallelogram and not a trapezoid?
  
• Are there atoms that can form covalent and ionic bonds?
  
• A 30-60-90 triangle has a hypotenuse of length 9.8. What is the length of the longer of the two legs?
  
• What is the formula of potassium phosphate in grams/mole?
  
• Question #11baf
  
• In the compound #PCl_3#, how many total valence electrons are present?
  
• What is the dissolution reaction for #KNO_3#. How many moles of ions are formed from it?
  
• How many atoms are in 2.0 mol of Cu?
  
• What causes London dispersion forces?