Answers edited by Nikka C.

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• How does atomic radius change from left to right across a period in the periodic table?
  
• How many grams of KOH are needed to neutralise 500mL of 2mol #L^-1# H2SO4?
  
• What does the atomic number represent?
  
• Why do all atoms of an element have the same atomic number?
  
• How many resonance structures does N3- have?
  
• Question #3ab4c
  
• -ide and -ate, how do you know which one to use?
  
• Question #f5356
  
• Given the reaction 2C3H7OH + 9O2 -->CO2 + 8H2O, how many moles of oxygen are needed to react with 3.40 mol C3H7OH?
  
• Question #a454b
  
• How would you balance the equation for the combustion of octane: C8H18(l)+O2(g)---->CO2(g)+H2O(l)?
  
• How would you draw all the resonance structures for nitrate, NO3-?
  
• How do you find the oxidation numbers for compounds?
  
• The compound adrenaline contains 56.79% carbon, 6.56% hydrogen, 28.3% oxygen, and 8.28% nitrogen by mass, what is its empirical formula?
  
• How would you balance Na2B4O7 + H2SO4 + H2O --> H3BO3 + Na2SO4?
  
• How do you balance C3H5(NO3)3 -->CO2 + H20 + N2 + O2?
  
• How do enzymes alter the rate of chemical reactions?
  
• How would you balance: KO2(s) + H2O(l) --? KOH(aq) + O2(g) +H2O2(aq)?
  
• How do you find formulas for covalent compounds?
  
• What is the oxidation number of Cr in Cr2(SO4)3?
  
• What is the balanced equation of C6H6+O2 = CO2+H2O?
  
• Question #6d6d4
  
• How would you balance H2 + O2 = H2O?
  
• Question #60418
  
• How can I demonstrate Boyle's law?
  
• How would you balance the following equation: P + O2 --> P4O10?
  
• What is the difference between first and second laws of thermodynamics?
  
• 2Al+Zn(NO3)2=2Al(NO3)3+Zn net ionic equation?
  
• How do you balance #Mg(NO_3)_2 + K_3PO_4 -> Mg_3(PO_4)_2 + KNO_3#?
  
• Question #97377
  
• If an atom has an atomic number of 10, how many electrons does it have?
  
• How would I determine the correct Lewis structure for NO3- (or any compound)? is it okay for the central atom to have a lone pair? I chose the structure that showed this (in a multi-choice question). But the correct answer showed N and O with a double bon
  
• How can I do stoichiometry mole to mole problems?
  
• What is the empirical formula of a compound that is 75% carbon and 25% hydrogen?
  
• Question #759d0
  
• Question #5b298
  
• What is the average oxidation number of sulfur in #S_4O_6^(2-)#?
  
• What is the mass of Cl in 21 g of NaCl?
  
• What is the atomic mass of carbon dioxide?
  
• An atom of a sodium has 11 proton, 11 electrons, and 12 neutrons, what is its mass number?
  
• Question #c5811
  
• How would you balance PCl5 + H2O -->H3PO4 + HCl?
  
• An organic compound is known to be composed of 46.60% carbon, 6.800% hydrogen, and 46.60% oxygen. What is its empirical formula?
  
• What are three examples of polyatomic and monoatomic ions?
  
• What is the oxidation number of the metal in #"manganate ion"#, #MnO_4^(2-)#?
  
• Would you find the number of electrons when given atomic number, mass number, and number of protons and neutrons?
  
• Question #8b6ce
  
• Question #c4cf5
  
• Can a chemical change alter the total number of atoms?
  
• Question #4d2bc
  
• Question #31f01
  
• Question #ee34d
  
• Question #c3c9a
  
• What is the name of the following ion: H2PO4-?
  
• What is the unabbreviated electron configuration of gold?