- What is the name of the model that contends that lone pair and bonding pair electrons assume positions around an atom that maximize their separations?
Your answer:
Valence bond theory.
Valence Shell Electron Pair Repulsion theory.
Molecular orbital theory.
The Pauli Exclusion Principle.
- A polyatomic molecule consisting of polar bonds arranged around the central atom in such a way that the dipoles don't cancel can be described as a:
Your answer:
polar molecule.
nonpolar molecule.
bipolar disorder molecule.
valence bond molecule.
- The bond enthalpy, a meaare of the bond strength between two atoms:
Your answer:
decreases as the number of bonds increases, decreases as the number of lone e pairs on neighboring atoms increases, and decrees as the atomic radii increase.
increases as the number of bonds increases, increases as the number of lone e pairs on neighboring atoms increases, and decreases as the atomic radii increase.
increases as the number of bonds increases, decreases as the number of lone e pairs on neighboring atoms increases, and decreases as the atomic radii increase.
increases as the number of bonds increases, decrases as the number of lone e pairs on neighboring atoms increases, and increases as the atomic radii increase.
- As the atomic radii of the halogen (Group 17) elements increases from top to bottom of the group, what should happen to the bond lengths between the atoms of their diatomic molecules?
Your answer:
The bond length will get progressively shorter.
The bond length will get progressively longer.
The bond length will not change.
The bond length fluctuates according to no set pattern.
- In Valence-bond theory a double bond is formed when:
Your answer:
four atomic orbitals, two from each bonding atom, overlap end-to-end.
four atomic orbitals, two from each bonding atom, overlap side-by-side.
two atomic orbitals, one from each bonding atom, overlap end-to-end, and two other atomic orbitals, one from each bonding atom, overlap side-by-side.
four atomic orbitals, two from each bonding atom, hybridize and overlap side-by-side.
- Which of the following is the strongest of the intermolecular forces?
Your answer:
London forces
Paris forces
dipole-dipole interaction
hydrogen bonding
- A hydrogen bond can be formed between H and all but one of the following elements. Which one?
Your answer:
O
N
F
Cl
- Excessive car engine wear is often seen in cold climtes, especially during the winter months, because:
Your answer:
the lubricating oil viscosity increases with deceasing temperature.
the lubricating oil viscosity decreases with decrsasmg ternperature.
the lubricating oils freeze solid.
the lubricating oils sublime.
- Since mercury in a narrow glass tube possesses a convex meniscus we can say:
Your answer:
the cohesive forces within the mercury liquid are stronger than the adhesive forces between the liquid and the glass.
the cohesive forces within the mercury liquid are weaker than the adhesive forces between the liquid and the glass.
the cohesive forces within the mercury liquid are equal to the adhesive forces between the liquid and the glass.
the capillary action of the liquid exceeds atmospheric pressure.
- For a constant atmospheric pressure, the higher the vapor pressure of a liquid the:
Your answer:
higher its boiling point.
lower its boiling point.
more time it will take for the liquid to boil.
more likely the liquid will sublime.
- At the triple point of of water:
Your answer:
only liquid water is present.
only water vapor is present.
only ice is present.
ice, liquid water and water vapor coexist.
- Use the bond enthalpy data in the necessary tables to calculate the reaction enthalpy in kJ/mol (to 3 sig figs) for C2H2(g) + 2H2(g) -> CH3CH3(g)
Your answer:
- Write the Lewis structure for iodine trichloride ICl3. From the VSEPR theory the iodine trichloride molecular is T-shape. True or false?
Your answer:
TrueFalse
- The carbon atom has an electron configuration of 1s2, 2s2, 2p2 and the CH4 molecule forms four sp3 hybrid orbitals. True or false?
Your answer:
TrueFalse
- CH4 is a polar covalent molecule. True or false?
Your answer:
TrueFalse
- Water (H2O) has a higher melting point than H2S because the London forces in water are much stronger than the London forces in H2S. True or false?
Your answer:
TrueFalse
- Eggs boiled on a high mountain would cook in a shorter time than eggs boiled at sea level. True or false?
Your answer:
TrueFalse
- Sodium chloride (NaCl) has a high melting point and glucose (C6H12O6) has a low melting point because the ionic bonding in NaCl is stronger than van der Waals forces in C6H12O6. True or false?
Your answer:
TrueFalse