In each of the following groups of substances, pick the one that has the given property. Justify your answer.
a. highest boiling point: HBr, Kr, or Cl2
b. highest freezing point: H2O, NaCl, or HF
c. lowest vapor pressure at 25°C: Cl2, Br2, or I2
d. lowest freezing point: N2, CO, or CO2
e. lowest boiling point: CH4, CH3CH3, or CH3CH2CH3
f. highest boiling point: HF, HCl, or HBr
g.
(a)
Interpretation:
From the given set of compounds, the compounds with highest boiling point, highest freezing point, lowest vapor pressure, lowest freezing point and lowest boiling point have to be identified and the same has to be justified.
Concept Introduction:
Matter is generally classified into three distinct categories - solid state, liquid state, gaseous state. In all of these three states of matter, the constituents (molecules or ions) of the matter do possess forces between them which are not the same in each state. These forces are called intermolecular forces.
The intermolecular forces are relatively strong in the solids than liquids and weaker in the gaseous substances. This variation influences many of the properties of all the three distinct states of the matter.
If the strength of intermolecular force is high in a substance then its melting point, freezing point, boiling point will be high and the vapor pressure will be low.
The strength of intermolecular forces is,
Answer to Problem 41E
The compound with highest boiling point is
Explanation of Solution
Identify the compound which has highest boiling point and justify it.
Analyze why the other compounds don’t have the highest boiling point and justify the same.
The compounds other than
The compound with the highest boiling point is identified and the same is justified.
(b)
Interpretation:
From the given set of compounds, the compounds with highest boiling point, highest freezing point, lowest vapor pressure, lowest freezing point and lowest boiling point have to be identified and the same has to be justified.
Concept Introduction:
Matter is generally classified into three distinct categories - solid state, liquid state, gaseous state. In all of these three states of matter, the constituents (molecules or ions) of the matter do possess forces between them which are not the same in each state. These forces are called intermolecular forces.
The intermolecular forces are relatively strong in the solids than liquids and weaker in the gaseous substances. This variation influences many of the properties of all the three distinct states of the matter.
If the strength of intermolecular force is high in a substance then its melting point, freezing point, boiling point will be high and the vapor pressure will be low.
The strength of intermolecular forces is,
Answer to Problem 41E
The compound with highest freezing point or melting point is
Explanation of Solution
Identify the compound which has highest melting point and justify it.
Analyze why the other compounds don’t have the highest melting point and justify the same.
The compounds other than
Hence
The compound with the highest melting point is identified and the same is justified.
(c)
Interpretation:
From the given set of compounds, the compounds with highest boiling point, highest freezing point, lowest vapor pressure, lowest freezing point and lowest boiling point have to be identified and the same has to be justified.
Concept Introduction:
Matter is generally classified into three distinct categories - solid state, liquid state, gaseous state. In all of these three states of matter, the constituents (molecules or ions) of the matter do possess forces between them which are not the same in each state. These forces are called intermolecular forces.
The intermolecular forces are relatively strong in the solids than liquids and weaker in the gaseous substances. This variation influences many of the properties of all the three distinct states of the matter.
If the strength of intermolecular force is high in a substance then its melting point, freezing point, boiling point will be high and the vapor pressure will be low.
The strength of intermolecular forces is,
Answer to Problem 41E
The compound with lowest vapor pressure is
Explanation of Solution
Identify the compound that has the lowest vapor pressure and justify it.
A boiling liquid partly vaporizes and the vaporized molecules do exist in equilibrium with the liquid molecules. The pressure exerted by the vaporized molecules is termed as vapor pressure. If the intermolecular forces are weak the molecules are not held together strongly that they are able to move freely. The pressure exerted by the molecules is directly proportional to the free movement of molecules. If the intermolecular forces are strong, the movement of the molecules is restricted to some extent that the pressure exerted by them will be low. Thus increase in the strength of intermolecular forces in a substance decreases its vapor pressure.
Analyze why the other compounds don’t have the lowest vapor pressure and justify the same.
The intermolecular forces exist in them are not of high strength.
Both
The compound with the lowest vapor pressure is identified and the same is justified.
(d)
Interpretation:
From the given set of compounds, the compounds with highest boiling point, highest freezing point, lowest vapor pressure, lowest freezing point and lowest boiling point have to be identified and the same has to be justified.
Concept Introduction:
Matter is generally classified into three distinct categories - solid state, liquid state, gaseous state. In all of these three states of matter, the constituents (molecules or ions) of the matter do possess forces between them which are not the same in each state. These forces are called intermolecular forces.
The intermolecular forces are relatively strong in the solids than liquids and weaker in the gaseous substances. This variation influences many of the properties of all the three distinct states of the matter.
If the strength of intermolecular force is high in a substance then its melting point, freezing point, boiling point will be high and the vapor pressure will be low.
The strength of intermolecular forces is,
Answer to Problem 41E
The compound with lowest freezing point is
Explanation of Solution
Identify the compound that has the lowest freezing point and justify it.
Analyze why the other compounds don’t have the lowest freezing point and justify the same.
The compounds other than
The other compounds
The compound with the lowest freezing point is identified and the same is justified.
(e)
Interpretation:
From the given set of compounds, the compounds with highest boiling point, highest freezing point, lowest vapor pressure, lowest freezing point and lowest boiling point have to be identified and the same has to be justified.
Concept Introduction:
Matter is generally classified into three distinct categories - solid state, liquid state, gaseous state. In all of these three states of matter, the constituents (molecules or ions) of the matter do possess forces between them which are not the same in each state. These forces are called intermolecular forces.
The intermolecular forces are relatively strong in the solids than liquids and weaker in the gaseous substances. This variation influences many of the properties of all the three distinct states of the matter.
If the strength of intermolecular force is high in a substance then its melting point, freezing point, boiling point will be high and the vapor pressure will be low.
The strength of intermolecular forces is,
Answer to Problem 41E
The compound with lowest boiling point is
Explanation of Solution
Identify the compound which has lowest boiling point and justify it.
Analyze why the other compounds don’t have the lowest boiling point and justify the same.
The compounds other than
The compound with the lower boiling point is identified and the same is justified.
(f)
Interpretation:
From the given set of compounds, the compounds with highest boiling point, highest freezing point, lowest vapor pressure, lowest freezing point and lowest boiling point have to be identified and the same has to be justified.
Concept Introduction:
Matter is generally classified into three distinct categories - solid state, liquid state, gaseous state. In all of these three states of matter, the constituents (molecules or ions) of the matter do possess forces between them which are not the same in each state. These forces are called intermolecular forces.
The intermolecular forces are relatively strong in the solids than liquids and weaker in the gaseous substances. This variation influences many of the properties of all the three distinct states of the matter.
If the strength of intermolecular force is high in a substance then its melting point, freezing point, boiling point will be high and the vapor pressure will be low.
The strength of intermolecular forces is,
Answer to Problem 41E
The compound with highest boiling point is
Explanation of Solution
Identify the compound which has highest boiling point and justify it.
Analyze why the other compounds don’t have the highest boiling point and justify the same.
The compounds other than
All the compounds in the given set are polar covalent compounds. Among the given compounds
The compound with the highest boiling point is identified and the same is justified.
(g)
Interpretation:
From the given set of compounds, the compounds with highest boiling point, highest freezing point, lowest vapor pressure, lowest freezing point and lowest boiling point have to be identified and the same has to be justified.
Concept Introduction:
Matter is generally classified into three distinct categories - solid state, liquid state, gaseous state. In all of these three states of matter, the constituents (molecules or ions) of the matter do possess forces between them which are not the same in each state. These forces are called intermolecular forces.
The intermolecular forces are relatively strong in the solids than liquids and weaker in the gaseous substances. This variation influences many of the properties of all the three distinct states of the matter.
If the strength of intermolecular force is high in a substance then its melting point, freezing point, boiling point will be high and the vapor pressure will be low.
The strength of intermolecular forces is,
Answer to Problem 41E
The compound with the lowest vapor pressure is
Explanation of Solution
Identify the compound which has lowest vapor pressure and justify it.
The compound
A boiling liquid partly vaporizes and the vaporized molecules do exist in equilibrium with the liquid molecules. The pressure exerted by the vaporized molecules is termed as vapor pressure. If the intermolecular forces are weak the molecules are held together loosely. Then they exhibit faster movement. The more the free movement of molecules the more will be the pressure exerted by them. If the intermolecular forces are strong, the movement of the molecules is restricted to some extent that the pressure exerted by them will be low. Thus increase in the strength of intermolecular forces in a substance decreases its vapor pressure.
Analyze why the other compounds don’t have the lowest vapor pressure and justify the same.
The intermolecular forces exist in them are not of high strength.
In
The compound with the lowest vapor pressure is identified and the same is justified.
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Chapter 9 Solutions
EBK CHEMISTRY: AN ATOMS FIRST APPROACH
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