Stoichiometry
Using the reaction 2H2 + O2 -> 2H2o, how many moles of H2 are required to produce 3 moles of water?
3 moles of H2
What is the definition of Equilibrium?
A state of balance between opposing forces or actions, resulting in stability where no net change occurs.
What is the definition of Intermolecular Forces?
The attractive interactions between neighboring molecules or ions.
Which atom is larger: Fe or O?
Fe is larger than O.
Atomic Structure is the internal organization of an atom.
Convert 34.8 grams of K into moles. (Molar mass is 39.10 g/mol)
0.890 moles of K
Write the Kc expression for: 2Ag + 3KCl = Ag2Cl3 + 3K.
Kc = [Ag2Cl3][K]3 / [Ag]2[KCl]3
Ion-Dipole, Hydrogen Bonding, Dipole-Dipole, London Dispersion Forces.
Which element has a lower ionization energy: Br or Na?
Na has a lower ionization energy than Br.
Which subatomic particle has a negative charge: Proton, Electron, Neutron?
Electrons have a negative charge.
What volume of 0.250 M OH solution is required to react completely with 30.0 mL of 0.100 M H2O solution?
12.0 mL of 0.250 M OH
Given the reaction H2 + 3NH = 3NH2, predict the effect of doubling the total pressure on the equilibrium concentration of 3NH.
Doubling the total pressure on the equilibrium concentration of 3NH will cause 3NH to increase.
When are Intermolecular Forces used?
When trying to predict or compare melting points, boiling points, or solubility.
Which element is more electronegative: S or Pb?
S is more electronegative than Pb.
What does the atomic number of an element represent?
A 20.0 g mixture of NaOH and NH4Cl is heated, causing it to lose 2.00 g of mass. What is the mass percentage of NaOH in the original mixture?
11.4% of NaOH.
What is the definition for Le Chatelier's Principle?
Le Chatelier's Principle states that if a dynamic equilibrium is disturbed by changing conditions, the system readjusts to counteract the disturbance which then establishes a new equilibrium.
Which compound would you predict to have the highest vapor pressure at 25 degrees celsius: CH4, NO2, or CH2OO?
CH4 would have the highest vapor pressure.
Why does Ag have a less negative electron affinity than Rh?
Ag has a less negative electron affinity than Rh because it has a filled 4d10 subshell.
What is Bohr's Model?
The equation 2HCl -> 2H + Cl decomposes. What mass of 2HCl is required to produce 2.0 L of Hydroygen Chloride?
3.26 g of 2HCl.
A 2.0 L flask is filled with 0.168 mol of N2 and 0.168 mol of K2. If Kc for N2 + K2 = 2NK is 38.7 at 400 degrees celsius, what are the final equilibrium concentrations of all species?
The final equilibrium concentrations of the species are N2 = 0.0204 M, K2 = 0.0204 M, and NK = 0.127 M.
Rank the following in increasing order of boiling point: Fe3, H2, H2S, and N2O.
1. H2
2. N2O
3. H2S
4. Fe3
Why is the second ionization energy of Mg exceptionally high?
This electron is removed from a filled and stable 2p6 subshell, making the process need more energy.
A 35 g baseball moves at 25 m/s. If speed is measured within 4% accuracy, what is the uncertainty of the position?
1.5 x 10-33 m.