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Which term identifi es a type of intermolecular force?*
Compared to H2S, the higher boiling point of H2O is due to the*
What is the vapor pressure of propanone at 50.°C?*
Based on Table H, what is the vapor pressure of CH3COOH at 90.°C?*
Which term represents an intermolecular force in a sample of water?*
Which compound has the strongest hydrogen bonding at STP?*
Which substance in the table below has the strongest intermolecular forces?
*
Base your answers to questions 8 on the information below and on your knowledge of chemistry.
A 100.-gram sample of liquid water is heated from 20.0°C to 50.0°C. Enough KClO3(s) is dissolved in the sample of water at 50.0°C to form a saturated solution.
Based on Table H, determine the vapor pressure of the water sample at its final temperature.*
Base your answers to questions 9 on the information below and on your knowledge of chemistry.
A sample of a molecular substance starting as a gas at 206°C and 1 atm is allowed to cool for 16 minutes. This process is represented by the cooling curve below.
Compare the strength of the intermolecular forces within this substance at 180.°C to the strength of the intermolecular forces within this substance at 120.°C.*
Base your answers to questions 10 on the information below and on your knowledge of chemistry.
Nitrogen dioxide, NO2, is a dark brown gas that is used to make nitric acid and to bleach flour. Nitrogen dioxide has a boiling point of 294 K at 101.3 kPa. In a rigid cylinder with a movable piston, nitrogen dioxide can be in equilibrium with colorless dinitrogen tetroxide, N2O4. This equilibrium is represented by the equation below.
2NO2(g) ⇌ N2O4(g) + 58 kJ
At standard pressure, compare the strength of intermolecular forces in NO2(g) to the strength of intermolecular forces in N2(g).*
Base your answers to questions 11 on the information below and on your knowledge of chemistry.
Diethyl ether is used as a laboratory and industrial solvent. The boiling point of diethyl ether at standard pressure is 34.6°C. The equation below represents a reaction that produces diethyl ether.
Explain, in terms of the strength of intermolecular forces, why the boiling point of diethyl ether at standard pressure is lower than the boiling point of water at standard pressure.*
Based on Table H, state the vapor pressure of ethanol at 75ºC.*
Determine the vapor pressure of ethanol at 90.°C.*
Base your answers to questions 14 on the information below and on your knowledge of chemistry.
A sample of seawater is analyzed. The table below gives the concentration of some ions in the sample.
Using the key below, draw two water molecules in the box, showing the orientation of each water molecule toward the calcium ion.
Base your answers to questions 15 on the information below and on your knowledge of chemistry.
Copper can be used for water pipes in homes. When the pipes corrode, copper atoms oxidize to form Cu2+ ions in the water.
A homeowner has a water quality report prepared for a sample of water taken from pipes in the home. According to the report, the 550.-gram sample contains 6.75 × 10−4 gram of dissolved Cu2+ ions.
Using the key below, draw two water molecules in the box, showing the orientation of each water molecule toward the Cu2+ ion.
