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Which solid would you expect to have the smallest band gap?
Which solid would you expect to have the smallest band gap?
Place the following compounds in order of increasing boiling point.
Place the following compounds in order of increasing boiling point.
Which is expected to have the largest dispersion forces?
Which is expected to have the largest dispersion forces?
What is the strongest type of intermolecular force present in CH3I?
What is the strongest type of intermolecular force present in CH3I?
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Tungsten has a radius of 141 pm and crystallizes in a body-centered cubic structure. What is the edge length of the unit cell?
Tungsten has a radius of 141 pm and crystallizes in a body-centered cubic structure. What is the edge length of the unit cell?
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Which solid has the highest melting point?
Which solid has the highest melting point?
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How much energy is required to vaporize 45.4 g of ethanol (C2H5OH, MW = 46.068 g/mol) at its boiling point, if its ΔHvap is 40.5 kJ/mol?
How much energy is required to vaporize 45.4 g of ethanol (C2H5OH, MW = 46.068 g/mol) at its boiling point, if its ΔHvap is 40.5 kJ/mol?
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Consider the phase diagram below. If the dashed line at 1 atm of pressure is followed from 100 to 250°C, what phase changes will occur (in order of increasing temperature)?
Consider the phase diagram below. If the dashed line at 1 atm of pressure is followed from 100 to 250°C, what phase changes will occur (in order of increasing temperature)?
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Choose the substance with the highest surface tension.
Choose the substance with the highest surface tension.
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Choose the substance with the higher vapor pressure at a given temperature. Why?
Choose the substance with the higher vapor pressure at a given temperature. Why?
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Consider the fictious heating curve shown below. What state of matter exists at -10°C?
Consider the fictious heating curve shown below. What state of matter exists at -10°C?
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Which of the following molecular diagrams best represents water in segment 4 on the heating curve shown below?
Which of the following molecular diagrams best represents water in segment 4 on the heating curve shown below?
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Rhodium crystallizes in a face-centered cubic lattice which has one atom in each corner and one atom in the center of each cube face. How many atoms are in one unit cell rhodium?
Rhodium crystallizes in a face-centered cubic lattice which has one atom in each corner and one atom in the center of each cube face. How many atoms are in one unit cell rhodium?
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Determine the vapor pressure (in torr) of a substance at 36°C, whose normal boiling point is 84°C and has a ΔHvap of 22.1 kJ/mol.
Determine the vapor pressure (in torr) of a substance at 36°C, whose normal boiling point is 84°C and has a ΔHvap of 22.1 kJ/mol.
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Consider the phase change diagram shown here. Identify the state present at point B.
Consider the phase change diagram shown here. Identify the state present at point B.
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Which of the following compounds exhibits hydrogen bonding?
Which of the following compounds exhibits hydrogen bonding?
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Which of the following substances would have the highest enthalpy of vaporization at a given temperature?
Which of the following substances would have the highest enthalpy of vaporization at a given temperature?
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Which of the following solids forms an p-type semiconductor?
Which of the following solids forms an p-type semiconductor?
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Which of the following is considered a molecular solid?
Which of the following is considered a molecular solid?
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When an X-ray beam of λ = 141.7 pm is incident on the surface of an iron crystal, it produces a maximum diffraction at an angle of θ = 41.30°. Assuming n = 1, calculate the separation between the layers of iron atoms in the crystal.
When an X-ray beam of λ = 141.7 pm is incident on the surface of an iron crystal, it produces a maximum diffraction at an angle of θ = 41.30°. Assuming n = 1, calculate the separation between the layers of iron atoms in the crystal.
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Study Notes
Multiple Choice Questions - Chemistry
- Question 1: Smallest band gap solid is Si (s).
- Question 2: Increasing boiling point order: CH4 < CH3CH3 < CH3CH2Cl < CH3CH2OH
- Question 3: C8H16 has the largest dispersion forces due to its higher molar mass.
- Question 4: The strongest intermolecular force in CH3I is dipole-dipole.
- Question 5: The edge length of the tungsten unit cell is 326 pm.
- Question 6: The solid with the highest melting point is LiCl (s) due to strong ionic bonds.
- Question 7: The energy required to vaporize 45.4g of ethanol is 39.9 kJ.
- Question 8: Following the dashed line from 100 to 250°C, the phase changes are first vaporization then a further increase in temperature.
- Question 9: HOCH2CH2OH has the highest surface tension due to hydrogen bonding.
- Question 10: CH3OH has a higher vapor pressure than CH3CH2CH2OH at a given temperature because CH3OH has a lower molar mass resulting in weaker IMFs.
- Question 11: At -10°C, the state of matter is solid.
- Question 12: The molecular diagram for water in segment 4 of the heating curve is liquid water.
- Question 13: Rhodium has a total of 8 atoms per unit cell.
- Question 14: The vapor pressure at 36°C for the substance is 239 torr.
- Question 15: The state at point B is Liquid (liquid phase).
- Question 16: Compounds exhibiting hydrogen bonding are CH3OH and CH3(CH2)2NH2.
- Question 17: CH3CH2OH has the highest enthalpy of vaporization among the provided substances.
- Question 18: Silicon doped with gallium forms a p-type semiconductor.
- Question 19: CO2 is a molecular solid.
- Question 20: The separation between the layers of iron atoms in the crystal is 107.3 pm.
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