ScienceChemistryAssignment 1: 11.1-11.5
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Assignment 1: 11.1-11.5

Adam Washington avatar Adam Washington
24 July 2022
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22 test answers

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question
What factors cause changes between the liquid and gas state?
answer
A liquid can be converted to a gas by cooling. *A gas can be converted into a liquid by cooling. *A liquid can be converted to a gas by heating. A gas can be converted into a liquid by decreasing the pressure of a gas sample. A gas can be converted into a liquid by heating. +A gas can be converted into a liquid by increasing the pressure of a gas sample.
question
What factors cause changes between the solid and liquid state?
answer
*A solid can be converted to a liquid by heating. *A liquid can be converted to a solid by cooling. A solid can be converted to a liquid by cooling. A liquid can be converted to a solid by heating.
question
A substance has a fairly high density, flows freely, and, on the molecular level, is made up of particles that are very close to one another. This substance is _____.
answer
a solid *a liquid a gas a solid or a liquid. It is not possible to say for certain based on the information given
question
Watch the animation and identify the correct conditions for forming a hydrogen bond.
answer
*Hydrogen bonding occurs when a hydrogen atom is covalently bonded to an N, O, or F atom. *A hydrogen bond is possible with only certain hydrogen-containing compounds. The CH4 molecule exhibits hydrogen bonding. *A hydrogen atom acquires a partial positive charge when it is covalently bonded to an F atom. A hydrogen bond is equivalent to a covalent bond.
question
Identify which of the following molecules can exhibit hydrogen bonding as a pure liquid.
answer
*N2H4 CF2H2 HCl CF4 *H3CO2H *C2H2O4 H2C2OH
question
The hydrides of group 5A are NH3, PH3, AsH3, and SbH3. Arrange them from highest to lowest boiling point. Rank the molecules from highest to lowest boiling point. To rank items as equivalent, overlap them.
answer
Highest to Lowest SbH3, NH3, AsH3, PH3
question
What is the predominant intermolecular force in the liquid state of each of these compounds: hydrogen fluoride (HF), carbon tetrafluoride (CF4), and methyl chloride (CH3Cl)? Drag the appropriate items to their respective bins.
answer
Dipole-dipole forces: CH3Cl Hydrogen Bonding: HF Dispersion forces: CF4
question
Rank the following compounds in order of decreasing boiling point: sodium bromide (NaBr), carbon tetrafluoride (CF4), and chloroform (CHCl3) Rank from highest to lowest boiling point. To rank items as equivalent, overlap them.
answer
Highest to Lowest Boiling Point: Sodium Bromide (NaBr), Chloroform (CHCl3), Carbon Tetrafluoride (CF4)
question
Which halogen has the highest boiling point?
answer
Br2 Cl2 *I2
question
Which substance has the highest boiling point?
answer
CO *CH3OH N2
question
How is the miscibility of a liquid with water related to the liquid's polarity?
answer
The polarity of a liquid does not affect its miscibility with water. The less polar the liquid, the more likely that it is miscible with water. *The more polar the liquid, the more likely that it is miscible with water. The more polar the liquid, the less likely that it is miscible with water.
question
Place the following compounds in order of increasing strength of intermolecular forces. CH4 CH3CH2CH3 CH3CH3
answer
*CH4 < CH3CH3 < CH3CH2CH3 CH3CH3 < CH4 < CH3CH2CH3 CH4 < CH3CH2CH3 < CH3CH3 CH3CH2CH3 < CH3CH3 < CH4 CH3CH2CH3 < CH4 < CH3CH3
question
Identify the compound that does not have hydrogen bonding.
answer
CH3NH2 CH3OH H2O HF *(CH3)3N
question
In liquid propanol, CH3CH2CH2OH which intermolecular forces are present?
answer
*Dispersion, hydrogen bonding and dipole-dipole forces are present. Only hydrogen bonding forces are present. Only dipole-dipole and ion-dipole forces are present. Only dispersion and dipole-dipole forces are present.
question
Place the following compounds in order of decreasing strength of intermolecular forces. HF H2 CO2
answer
H2 > CO2 > HF HF > H2 > CO2 *HF > CO2 > H2 CO2 > H2 > HF CO2 > HF > H2
question
Which compound would you expect to have greater surface tension, acetone [(CH3)2CO] or water (H2O)?
answer
(CH3)2CO *H2O
question
Complete the following sentence.
answer
Water will have the higher surface tension since it exhibits hydrogen bonding , when compared to acetone.
question
Rank these liquids by their expected surface tension.
answer
Greatest to Least Surface Tension: HO-CH2CHCH2-OH-OH, CH3CHCH2-OH-OH, CH3CH2CH2-OH, CH3CH2OCH3
question
The Society of Automotive Engineers has established an accepted numerical scale to measure the viscosity of motor oil. For example, SAE 40 motor oil has a higher viscosity than an SAE 10 oil. Rank the following hydrocarbons by their expected viscosity.
answer
Most viscous to least: CH3CH2(CH2)9CH2CH3, CH3CH2(CH2)7CH2CH3, CH3CH2CH2CH2CH2CH2CH2CH3
question
Determine the amount of heat (in kJ) required to vaporize 1.75 kg of water at its boiling point. For water, ?Hvap = 40.7 kJ/mol (at 100 ?C).
answer
3960 kJ
question
Use the data to determine the heat of vaporization of nitrogen. Express your answer in kilojoules per mole.
answer
?H = 5.92 kJ/mol
question
Determine the normal boiling point of nitrogen. Express your answer in kelvins.
answer
T = 77.4 K