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presence of extensive hydrogen bonding between water molecules leads to
  • a)
    low freezing point, high boiling point
  • b)
    high freezing point, high boiling point
  • c)
    low heat of vaporisation and high heat of fusion
  • d)
    high heat of vaporisation and low heat of fusion
Correct answer is option 'B'. Can you explain this answer?
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presence of extensive hydrogen bonding between water molecules leads t...
Water has a high boiling point because of the presence of extensive hydrogen bonding interactions between the water molecules in the liquid phase (water is both a strong hydrogen bond donor and acceptor). When heat is first applied to water, it must break the intermolecular hydrogen bonds within the sample.
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presence of extensive hydrogen bonding between water molecules leads t...
Explanation:


Water molecules are held together by hydrogen bonds, which are relatively strong intermolecular forces. Due to this, water has unique properties such as high boiling and melting points.

High Freezing Point:


The extensive hydrogen bonding between water molecules causes them to arrange themselves in a highly ordered structure when they freeze. This ordered structure takes up more space than the disordered liquid, which is why ice is less dense than liquid water. As a result, ice floats on water. The extensive hydrogen bonding between water molecules also makes it difficult to break the bonds and melt the ice. This is why water has a high freezing point.

High Boiling Point:


Similarly, the extensive hydrogen bonding between water molecules makes it difficult to break the bonds and turn the liquid into vapor. This is why water has a high boiling point.

Therefore, the presence of extensive hydrogen bonding between water molecules leads to a high freezing point and a high boiling point.
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Attempt All sub parts from each question.Molecular Perspective In water, there are two types of molecules. Some molecules are at the surface, called exterior molecules, and some molecules are inside, called interior molecules. The interior molecules are attracted to all the molecules around them. The exterior molecules are attracted to only the other surface molecules and to those below the surface. So that the energy state of the molecules on the interior is much lower than that of the molecules on the exterior. The molecules always try to maintain a lower energy state and hence the exterior molecules experience a downward force. This force is known as cohesive force. As a result they try to maintain a minimum surface area, thus allowing more molecules to have a lower energy state. Thus surface tension is created. The water molecules attract one another due to the water molecule’s polar property. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen, cause water to "stick " together. This is why there is surface tension. Water has very high surface tension. It is 72.8 milli newton per meter at 20°C.Q. The water molecules attract one another due to the water molecule’s

Attempt All sub parts from each question.Molecular Perspective In water, there are two types of molecules. Some molecules are at the surface, called exterior molecules, and some molecules are inside, called interior molecules. The interior molecules are attracted to all the molecules around them. The exterior molecules are attracted to only the other surface molecules and to those below the surface. So that the energy state of the molecules on the interior is much lower than that of the molecules on the exterior. The molecules always try to maintain a lower energy state and hence the exterior molecules experience a downward force. This force is known as cohesive force. As a result they try to maintain a minimum surface area, thus allowing more molecules to have a lower energy state. Thus surface tension is created. The water molecules attract one another due to the water molecule’s polar property. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen, cause water to "stick " together. This is why there is surface tension. Water has very high surface tension. It is 72.8 milli newton per meter at 20°C.Q. Surface tension of water is

Attempt All sub parts from each question.Molecular Perspective In water, there are two types of molecules. Some molecules are at the surface, called exterior molecules, and some molecules are inside, called interior molecules. The interior molecules are attracted to all the molecules around them. The exterior molecules are attracted to only the other surface molecules and to those below the surface. So that the energy state of the molecules on the interior is much lower than that of the molecules on the exterior. The molecules always try to maintain a lower energy state and hence the exterior molecules experience a downward force. This force is known as cohesive force. As a result they try to maintain a minimum surface area, thus allowing more molecules to have a lower energy state. Thus surface tension is created. The water molecules attract one another due to the water molecule’s polar property. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen, cause water to "stick " together. This is why there is surface tension. Water has very high surface tension. It is 72.8 milli newton per meter at 20°C.Q. The tendency of water to maintain .............. surface area is known as surface tension.

Attempt All sub parts from each question.Molecular Perspective In water, there are two types of molecules. Some molecules are at the surface, called exterior molecules, and some molecules are inside, called interior molecules. The interior molecules are attracted to all the molecules around them. The exterior molecules are attracted to only the other surface molecules and to those below the surface. So that the energy state of the molecules on the interior is much lower than that of the molecules on the exterior. The molecules always try to maintain a lower energy state and hence the exterior molecules experience a downward force. This force is known as cohesive force. As a result they try to maintain a minimum surface area, thus allowing more molecules to have a lower energy state. Thus surface tension is created. The water molecules attract one another due to the water molecule’s polar property. The hydrogen ends, which are positive in comparison to the negative ends of the oxygen, cause water to "stick " together. This is why there is surface tension. Water has very high surface tension. It is 72.8 milli newton per meter at 20°C.Q. The energy state of the interior molecules of a fluid is

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presence of extensive hydrogen bonding between water molecules leads toa)low freezing point, high boiling pointb)high freezing point, high boiling pointc)low heat of vaporisation and high heat of fusiond)high heat of vaporisation and low heat of fusionCorrect answer is option 'B'. Can you explain this answer?
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