be
volume of water shrinks between
o degree to 4 degree.
True or False
Answers
Answer:
answer is false.
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Answer:
The density of water between 0 and 4 Celsius is influenced by two key opposing forces caused due to Thermal kinetic expansion and H-bonding.
Thermal kinetic expansion force is simply the force that causes molecules to move around more when there is a rise in temperature. Because of this higher thermal forces the molecules move apart and so become less dense.
Hydrogen bonding force can be simply explained as the force of attraction between the hydrogen attached to an electronegative atom of one molecule and an electronegative atom of a different molecule.
In the case of water, the Hydrogen bonding force is weaker (It is about 23 kJ mol–1 compared to the O–H covalent bond strength of 492 kJ mol–1).
At temperature above 4 degrees Celsius due to the higher levels of kinetic energy, the molecules move around more making it improbable for hydrogen bonding to form. However, when the temperature falls below 4 degrees Celsius, the movements of water molecules are reduced significantly enabling the formation of Hydrogen bonds. When the temperature drops the further the more hydrogen bonds are formed and the H bonds start to widen the space between the molecules causing the expansion in volume.
At 0 degrees Celsius, water molecules are influenced by the hydrogen bonding forces to align themselves into a hexagonal 3D lattice to form the 6-sided structure of ice crystals which has more empty space between the water molecules.