Study set with typical representative questions
SI system of unit, precision, conversion, density
Q: Given is density d= 2.22 g/mL . Desired conversion is to kg/m^3. Consider SigFigs.
Atom, ion, isotope, basic knowledge about neutrons, protons and electrons
Q: Find the number of electrons, protons and neutrons in 60 Co 2+.
Nomenclature, ionic compounds, polyatomic ions, cations, anions, binary compounds.
Q: What are the names of NaCl, CuCl2, N3O5, Na2SO4
Q: What is the formula of potassium chloride, cooper(I) chloride, dinitrogentetroxide
Q: which one is not name correctly: dinitrogen teroxide N2O4, iron(iii) sulfate Fe2(SO4)3, nitrogen
trifluoride NF3, aluminum trinitrate Al(NO3)3
Concept of amu, mole, molar mass, and conversions : atoms(ions) ->molecules(compounds) ->moles>mass
Q : How many chlorine atoms are in 5g of CuCl2?
Q: How many moles of CuCl2 are in 5g of CuCl2?
Q: How many g (mass) is 2.344 10^26 compound units of CuCl2?
Empirical formula from mass % and vice versa:
Q: find empirical formula if 55% K, 15% P and 30% O
Q: find % by mass of K3PO4
Electrolytes, conductivity, strong weak acids/base, ionic compounds,
Q: Which is ionic compound, NH4Cl, CO2 ,I2
Q: Which is strongest electrolyte or conductor, SO2, HF, AgNO3 ?
Solubility (using table)
Q: Is SrSO4 soluble? Is CuS soluble? Is Ca(OH) 2 soluble ? Is Mg(OH)2 soluble?
Q; Will Potassium acetate and hydrochloric acid produce a precipitate ?
Ionic and net ionic equations (including solubility)
Q: What is the net ionic equation of the reaction between CaCl2 and Na2CO3
Chemical reactions, balancing and quantitative aspects (equivalents) : finding moles or masses of
products or reactants, limiting reactants and excess reactants
Q: Balance a chemical reaction: C5H7O + O2
Q; If 26 g of oxygen gas reacts with excess hydrogen gass , how many moles of water are produced?
Q: If 26 g of oxygen gas reacts with 26g of hydrogen gass , how many grams of water are produced
Q; If 26 g of oxygen gas reacts with 26g of hydrogen gass , how many grams of hydrogen and how many
of oxygen was left
Chemical equations and stoichiometry in solution: M molarity, neutralization-titration-end point,
dilution, concentration
Q: What is the NO3 - concentration in 3. M solution of Al(NO3)3
Q: 5g of NaCl are dissolved in 250mL of water , what is the concentration M?
Q; What is the concentration of Cl- in a solution made by dilution 250mL of 2M of FeCl3?
Q: 20mL of H2SO4 is titrated to the end point (neutralized ) with 0.5 M solution of KOH. What is the
concentration of H2SO4?
Q; What is the concentration M of aqueous methanol when 0.2L of 2M solution is diluted to 0.8 L
Electronic structure of atoms and the characteristics of electromagnetic fields –photons
Q: What is the energy of a 420nm photon
Q: What is the frequency of 420nm photon
Q: Write down the eelectronic configuration of N, P and As
Q: 1s22s22p63s23p63d3 is electron configuration of ..?
Q: What are the rules for n, l, m, s? Apply to configurations
Q: What is the electron screening?
Q: Which of these has the largest size: K, F, ge, Rb , Br
Q: Which of these has largest first ionization energy: Na, Al, Se, Cl and K. (How about the second?)
Lewis structure, ionic , covalent bonds, lone/nonbonding pairs,
Q: Write down the Lewis structures for SO2, H2SO4, IBr2, I3, NO3, SO3, H3PO4, C6H6, NF3, BF3, CO2
CHCl3, F2, XeF4, (add some more)
Q Which of those violets octet rule and how
Q; Count the number of double and single bonds, nonbonding pairs in the previous molecules
Q: Cont the number of resonances in previous compounds
Q: identify formal charges in those molecules, what can they help you with?
Q: Find the molecular geometries (name them) for those compounds
Q: Find the angles in these compounds
Q; Find the hybridization for central atoms in these molecules
Q: based on the found hybridization identify angles between bonds in these atoms
Q Which of these molecules are polar?
Q: Identify order of polarity for bonds they form using electronegativity data : Be, F, N, Mg
Gas equation and its derivatives
Q : find pressure of 1 mole of molecules if volume is22.4L and temperature is 25C
Q: A balloon has volume of 5L at 50C and pressure of 200torr, what is the temperature if the volume
was reduced to 3L at constant pressure?
Q: in a gas mixture total pressure is 9 atm and partial pressures of He an Ne are 1.5 and 2 atm. What is
the mole fraction of Ar?
Q: Temperature of a gas is 22C , pressure 600torr and density 2g/L . What is the molar mass of that gas?
Q: CH4 effuses in 500s and CO2 under the same condition will effuse in ………s ?
Solutions and liquids
Q: Which of the following pairs will stronger intermolecular bond: Xe or Rn, H2O or CH4, CO or CO2
Q: Find examples of two different molecules /compounds that are attracted by a) dipole force, b)
hydrogen bond, C) ionic-dipole force, d ) induced dispersion force only
Phase diagrams:
Q: Identify all major points in the phase diagram of H2O, CO2