Determine the bond of the compounds below as ionic or covalent bond, and estimate the freezing points of 0.80 molality aqueous solutions. a) NaCl

/in /by

Final – Review – General Chemistry I

  1. Convert the temperature from 120 C to ºF and K.
  2. Calculate the molarity of the following solutions
  3. 50 g of sodium hydroxide is dissolved in water to make 300 mL of solution.

 

  1. 5 of sodium chloride is dissolved in water to make 750 mL of solution

 

  1. It is determined that 22 g of sodium chloride are soluble in 60.0 g of water at 40 ºC. What is the solubility of sodium chloride in grams /150 g water?

 

  1. Using a periodic table, find the element that is about three times as heavy as carbon. What is it nuclear symbol? How many protons, neutrons and electrons are there in the atom?

 

  1. How many grams are there in 1 atom of Oxygen? Avogadro’s number = 6.022 x 1023

 

  1. Write the electron configuration of each specie and the number of protons and electrons:
  2. Cl–,
  3. O
  4. Na+

 

  1. Write the molecular, total ionic and net ionic equations for
  2. Mg(NO3)2 (aq) + Na2CO3 (aq) ®
  3. BaBr2(aq) + Na2SO4(aq) ®

 

  1. A compound is found to contain 64.80 % carbon, 13.62 % hydrogen, and 21.58 % oxygen by weight. What is the empirical formula for this compound? The molecular weight for this compound is 148.28 g/mol. What is its molecular formula?

 

  1. Balance the following equations:
  2. FeCl3+ MgO ® Fe2O3 + MgCl2
  3. ZnS + O2® ZnO + SO2
  4. Fe2O3 + C ® Fe + CO2

 

  1. Calculate the average speed of a neon atom at 40 ºC. R = 8.31 x 103m2/s2.mol.K

 

11 If a hydrogen atom is excited from n = 2 state to  n = 5 state, a) how much energy does this correspond to? b) Is this an absorption or an emission? c) What is the wavelength of the photon involved in this process in units of nanometers? d) What is the frequency of the light involved in this process in units of s-1?

 

12 Assign the oxidation number to each element in the following species:

  1. H2
  2. FeCl3
  3. NaCl
  4. CH4

 

13.What is the vapor pressure at 25.0 °C of a solution composed of 15.71 g of NaCl and 50.5 g of ethanol (MW = 46.02 g/mol). (The vapor pressure of pure ethanol at 25.0 °C is 59 mm Hg.). Raoult` Law

 

  1. Determine the bond of the compounds below as ionic or covalent bond, and estimate the freezing points of 0.80 molality aqueous solutions.
  2. a) NaCl
  3. b) CO2
  4. d) CaCl2
  5. Write the complete set of quantum numbers of the last electron for the following elements
  6. a) Na
  7. b) Na+
  8. C) Cl
  9. d) Cl-
  10. e) Mg
  11. f) Mg2+