Does Heavy Water Ice Sink or Float

While regular ice floats in water, heavy water ice cubes sink in regular water. Ice made from heavy water would, however, be expected to float in a glass of heavy water. Heavy water is water made using the hydrogen isotope deuterium rather than the usual isotope (protium). Deuterium has a proton and a neutron, while protium only has the proton in its atomic nucleus. This makes deuterium twice as massive as protium. Several Factors Affect the Behavior of Heavy Water Ice Deuterium forms stronger hydrogen bonds than protium, so the bonds between hydrogen and oxygen in heavy water molecules would be expected to impact the water heavy water molecules pack when the substance changes from a liquid to a solid. Even though deuterium is more massive than protium, the size of each atom is the same, since it is the electron shell that determines its  atomic size, not the size of an atoms nucleus.Each water molecule consists of an oxygen bonded to two hydrogen atoms, so there is not a huge mass difference between a heavy water molecule and a regular water molecule because most of the mass comes from the oxygen atom. When measured, heavy water is about 11% denser than regular water. While scientists could make a prediction whether heavy water ice would float or sink, it required experimentation to see what would happen. It turns out heavy water ice does sink in regular water. The likely explanation is that each heavy water molecule is slightly more massive than a regular water molecule and heavy water molecules may pack more closely than regular water molecules when they form ice.

Operating System Security ( Os Security ) Essay - 2068 Words

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Frees Psychiatric Observation of Amanda Wi Essay Example For Students

Frees Psychiatric Observation of Amanda Wi Essay ngfield Glass Menagerie essays Psychiatric Observation of Amanda Wingfield Amanda Wingfield has gone under psychiatric observation. Her psychiatric analysis appears to be of a pensive and worrying individual. Nonetheless, Amanda is a strong woman who has been putting up with the worst-case scenarios a person can face in their life. Her husband has abandoned her and their children. She has to live with the fact that her son, Tom could turn out a drunkard and also her daughter, Laura who in life may not achieve much because of her shyness. Amanda is a strong human being even though her family life as well as her own is not much one would thank for. Amanda constantly repeats of her only true accomplishment to this day. This is of the time she had seventeen gentlemen callers in one day while she was living in Blue Mountain. This story Amanda brings out repeatedly has conveyed the fact that she is an insecure and a self-centred woman. This is the wall keeping her from accomplishing other wonderful things. She is seeking too much comfort from this past accomplishment, which I believe she needs to let go of. I think one of the many reasons that she is holding on to this past history is because she needs her children to be proud of their mother. Amanda needs to release her grip on this past and move on. Amandas personality reflects a domineering character. She cannot refrain herself from making decisions for her two children. Her many ways of motherly love, sometimes seems too much for any person. At one time she demands Tom to chew his food properly. This sort of attachment to a certain individual results in many bitter arguments. This is Amandas weakness. It is her weakness of not being able to let her children live their own lives. Her daughter, Laura seems to be the shy type but Laura herself knows when one does not have a chance at something. In her case she is not able to find gentlemen callers. However, Amanda cannot help but interfere and live in denial about it. Her weakness is further destabilized by the fact that her son desires to join the marines and leave home. Her past swims around her as this is mentioned. Her husband had abandoned her as he `fell in love with long distance. She faces her fear of not having a son to provide food for Laura as well as herself. Her further fear is of her daughter ending up single for the rest of her life. She does not want to believe that her only daughter is a disheartened and a lonesome woman who finds contentment among a world of glass figurines. Her only cure for this weakness is to motivate Laura and to help her overcome her acute bashfulness. Mentally Amanda Wingfield seems capable to hold on to and perform daily activities. However, if her weakness does not ease she could overstress herself. She should seek counselling as well as find friends to share her feelings. Her weakness can be helped if her two children also pick themselves up and get on and build a happy and an improved life. .