Answers created by Nikka C.

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• Question #78d26
  
• How do you balance #Mg(NO_3)_2 + K_3PO_4 -> Mg_3(PO_4)_2 + KNO_3#?
  
• Question #31f01
  
• Question #c3c9a
  
• What is the balanced equation of C6H6+O2 = CO2+H2O?
  
• What is the balanced equation of C6H6+O2 = CO2+H2O?
  
• In the equation pv=nrt, how would you solve for v?
  
• Question #2e157
  
• How do you balance #H_3PO_4 + HCI -> PCl_5 + H_2O#?
  
• Elemental analysis of a compound showed that it consisted of 81.82% carbon and 18.18% hydrogen by mass, how many hydrogen atoms appear in the empirical formula of the compound?
  
• What are the oxidation numbers of 2Cl- and Cl2?
  
• Can a chemical change alter the total number of atoms?
  
• An atom of a sodium has 11 proton, 11 electrons, and 12 neutrons, what is its mass number?
  
• How would you balance the equation for the combustion of octane: C8H18(l)+O2(g)---->CO2(g)+H2O(l)?
  
• What is the electron configuration of Cl-?
  
• What is the molecular mass of a compound if 560mL have a mass of 1.10g at STP?
  
• Question #759d0
  
• Question #8b6ce
  
• 2Al+Zn(NO3)2=2Al(NO3)3+Zn net ionic equation?
  
• -ide and -ate, how do you know which one to use?
  
• How would you balance: CaSO4+AlCl3→CaCl2+Al2(SO4)3?
  
• Question #6d6ed
  
• What is the average oxidation number of sulfur in #S_4O_6^(2-)#?
  
• What is the name of the following ion: H2PO4-?
  
• What is the oxidation number of nitrogen in the nitrate ion?
  
• Write the electron configuration of #"Cd"^(2+)#?
  
• Which of the following polyatomic ions has a 3- ionic charge: hydrogen carbonate, hydroxide, sulfate, nitrate, or phosphate?
  
• What is the oxidation state of the K atom in KClO4?
  
• An organic compound is known to be composed of 46.60% carbon, 6.800% hydrogen, and 46.60% oxygen. What is its empirical formula?
  
• Question #60418
  
• Question #efcee
  
• What is the molar mass of (NH4)2CO3?
  
• Question #ed336
  
• Question #c42a5
  
• How many valence electrons does phosphorus have?
  
• How would you balance the following equation: Fe+O2 --> Fe2O3?
  
• The element calcium has the atomic number of 20 and the mass number of 40, how many neutrons does it have?
  
• Is the following equation balanced: NH2CH2COOH (s) + 9/4 O2 --> 2 CO2 (s) + 5/2 H2O (l) + 1/2 N2 (g)?
  
• How many d orbitals must be occupied by single electrons before the electrons begin to pair up?
  
• Question #6fe8f
  
• Question #4a869
  
• How would you balance H3PO4 +Mg(OH)2-->Mg3(PO4)2 +H20?
  
• Question #9f407
  
• What is the oxidation number of carbon monoxide?
  
• How do you find formulas for covalent compounds?
  
• How are isotopes named?
  
• Would you find the number of electrons when given atomic number, mass number, and number of protons and neutrons?
  
• How many orbitals are in the 4p subshell?
  
• What is the oxidation number of the metal in #"manganate ion"#, #MnO_4^(2-)#?
  
• Question #6d6d4
  
• What is the unabbreviated electron configuration of gold?
  
• How can you separate homogeneous mixtures?
  
• Question #9f125
  
• How do enzymes alter the rate of chemical reactions?
  
• What is the Lewis structure of N2?
  
• If an atom has an atomic number of 10, how many electrons does it have?
  
• What is the difference between first and second laws of thermodynamics?
  
• How do you find the oxidation numbers for compounds?
  
• 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 would you find atomic weight?
  
• What are three examples of polyatomic and monoatomic ions?
  
• Why do all atoms of an element have the same atomic number?
  
• Question #5b298
  
• How would you draw all the resonance structures for nitrate, NO3-?
  
• Question #97377
  
• Question #89643
  
• How do you balance C3H5(NO3)3 -->CO2 + H20 + N2 + O2?
  
• Question #ee34d
  
• How many moles of KCl are in 27.5 g of KCl?
  
• Question #eec3c
  
• What is the Lewis structure of H2O?
  
• What is the empirical formula of a compound that is 75% carbon and 25% hydrogen?
  
• How would you balance __S8+__F2--> __SF6?
  
• What are some real life uses of Stoichiometry?
  
• Question #a454b
  
• What do the skeletal structures of C6H12 look like?
  
• How many grams of KOH are needed to neutralise 500mL of 2mol #L^-1# H2SO4?
  
• Given the reaction 2C3H7OH + 9O2 -->CO2 + 8H2O, how many moles of oxygen are needed to react with 3.40 mol C3H7OH?
  
• How can I do stoichiometry mole to mole problems?
  
• Question #65f0f
  
• How would you balance Na2B4O7 + H2SO4 + H2O --> H3BO3 + Na2SO4?
  
• Question #d5404
  
• Question #f5356
  
• Question #27ab2
  
• What is the oxidation number of sulfur in an HSO4- ion?
  
• What does the atomic number represent?
  
• How does atomic radius change from left to right across a period in the periodic table?
  
• Question #4b7e9
  
• Can any one explain the Heisenberg Uncertainty Principle in the simplest ways?? Thank you so much.
  
• When balancing a chemical equation, why can you change coefficients, but not subscripts?
  
• How would you balance the following equation: P + O2 --> P4O10?
  
• Question #d12cc
  
• Question #e22a4
  
• What is the oxidation state of nitrogen?
  
• Question #60472
  
• How would you balance PCl5 + H2O -->H3PO4 + HCl?
  
• Question #5f2c7
  
• What is the oxidation number of Cr in Cr2(SO4)3?
  
• Question #2a2bf
  
• How did Rutherford's gold foil experiment differ from his expectations?
  
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