7) It is possible to form D2O (deuterium oxide). This molecule contains 2 “heavy” hydrogen isotopes....

7) It is possible to form D2O (deuterium oxide). This molecule contains 2 “heavy” hydrogen isotopes. Compare the properties such as density, melting point, boil point, etc. between H2O and D2O. List reasons for these differences (include at least 5 properties). (15 pts.)

Expert Solution

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COMPARISON BETWEEN D₂O (HEAVY WATER) AND H₂O (WATER)

	H₂O (WATER)	D₂O (HEAVY WATER)	REASON FOR THE DIFFERENCE
DEFINITION:	A water molecule is formed by the combination of two atoms of hydrogen and one atom of oxygen.	Heavy water is also water but with an exception, it contains more than normal proportion of isotope Deuterium.	Water is combination of two hydrogen atoms and oxygen but heavy water is combination of two Deuterium and one oxygen.
BOILING POINT:	100^oC	101.4^oC	Hydrogen bonding in D₂O is slightly greater than H₂O. Therefore D₂O needs more energy to boil.
DENSITY:	Less than D₂O.	11% more than H₂O.	Deuterium isotope of hydrogen that is twice as heavy as hydrogen due to an added neutron. Therefore D₂O is more heavier/denser.
FREEZING POINT:	0^oC	3.8^oC	More massive bound deuterons have less zero-point energy than the less bound Hydrogen/protons.
pH VALUE:	Low 7	Comparatively high.	Heavy water is less dissociated than normal water.
SHAPE:	Bent/ Broader structure.	Tetrahedral shape.	Heavy water molecule is more massive than normal water molecules.(added neutron)

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