5219800
Description
Flashcards by Bee Brittain, updated more than 1 year ago
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Created by Bee Brittain
over 8 years ago
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| Question | Answer |
| Hydrogen bonds are a type of what? | Permanent dipole-dipole |
| Hydrogen bonds are found between molecules containing what? | - An electronegative atom with a lone pair of electrons such as Nitrogen, Oxygen or Fluorine - A hydrogen atom attached to an electronegative atom such as H-O, H-N or H-F |
| Complete the sentence: One anomalous property of _________ is that its solid form is _____ _____ than its _______ form | One anomalous property of WATER is that its solid form is LESS DENSE than its LIQUID form |
| Why is Ice less dense than water? | 1) The hydrogen bonds hold the water molecules apart in an open lattice structure 2) The water molecules in ice are therefore further apart then water 3) This makes solid ice less dense than water and so it floats |
| Explain the open lattice structure that the hydrogen bonding gives in solid water, Ice. | Water has two hydrogen atoms bonded to an oxygen atom that also has two lone pairs. This means water can form 4 H bonds. The H bonds extend outwards, holding the H2O molecules slightly apart and forming an open tetrahedral lattice full of holes. |
| Bond angle about the H atom involved in the H bond is roughly: | 108 degrees |
| Complete the sentence: Water has a relatively ____ boiling and melting point. | Water has a relatively HIGH boiling and melting point. |
| Explain why water has an anomalous melting point | As with all molecules, water has London forces however these are weak. Although water also has Hydrogen bonds and these require a large quantity of energy to be broken. |
| Describe the melting and boiling of water with its arrangement of bonds and forces | When water melts, the lattice breaks down and the rigid arrangement of Hydrogen bonds is broken. However when water boils, the hydrogen bonds break completely. |
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