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- 1. Multiple Choice
A water strider can skate along the top of a pond because:covalent bonds result in water cohesionhydrogen bonds result in water cohesion (surface tension)water striders have adapted to take advantage of water cohesionlow surface tension of water - 2. Multiple ChoiceWhat word describes when water is attracted to other substances?cohesionadhesioncapillary actionsurface tension
- 3. Multiple ChoiceWhat two elements make up water?Helium and oxygenHydrogen and oxygenhelium and carbonoxygen and carbon
- 4. Multiple ChoiceWhy can water have no net charge but have slight charges in different parts of the molecule?The oxygen end is slightly negative and the hydrogen end is slightly positiveThe hydrogen end is slightly negative and the oxygen end is slightly positiveThe hydrogen and oxygen ends change in polarityBecause it is hydrophobic
- 5. Multiple ChoiceAttractions between water molecules are calledCovalent bondsIonic bondsPolar bondsHydrogen bonds
- 6. Multiple ChoiceThe attraction that causes water and other liquids to form drops on thin films is called ________________. This is also water’s ability to be attraction to other water molecules.adhesioncapillary actioncohesionsurface tension
- 7. Multiple ChoiceWhich is NOT a unique property of water?Frozen water floats on liquid water.Water covers most of the Earth’s surface and retains a large amount of heat.Water molecules stick to each other through hydrogen bonds.Water cools very rapidly.
- 8. Multiple ChoiceWater is polar because...The unequal sharing of electrons gives the water molecule a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms.The molecule has two poles, at which the it is colder than other regions of the molecule.The unequal sharing of electrons gives the water molecule a slight negative charge near its hydrogen atoms and a slight positive charge near its oxygen atom.The water molecule is neutral.
- 9. Multiple Choicemolecule in which opposite ends have opposite electric chargescohesionpolar moleculehydrogen bondsolution
- 10. Multiple ChoiceWhy does ice float?As water freezes, it expands and its density decreases.As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.As water freezes, air becomes trapped between the hydrogen bonds of water molecules.As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.
- 11. Multiple ChoiceWhich end of the water molecule has a slightly positive charge?the oxygen endthe hydrogen endboth ends are slightly positiveneither end is positive
- 12. Multiple ChoiceWater is a universal solvent because it...It can be found anywhereIt freezes when it gets coldfloats when frozenDissolves most substances
- 13. Multiple ChoiceWhich of the following is LEAST likely to dissolve in water?nonpolar fats and oilspolar sugar moleculessalt made of a positive sodium ion and a negative chloride ionall of the substances will dissolve easily in water
- 14. Multiple ChoiceWhich characteristic of water will allow a paperclip to remain floating on water when the paperclip is gently placed on top of the water?adhesionsurface tensionsolvent propertiesnonpolar
- 15. Multiple ChoiceWhich statement best describes an effect of the low density of frozen water in a lake?When water freezes, it contracts, decreasing the water level in a lake.Water in a lake freezes from the bottom up, killing most aquatic organisms.When water in a lake freezes, it floats, providing insulation for organisms below.Water removes thermal energy from the land around a lake, causing the lake to freeze.
- 16. Multiple ChoiceWhich types of compounds dissolve easily in water?Polar and NonpolarPolar and IonicNonpolar and IonicCovalent and Nonpolar
- 17. Multiple ChoiceWhat property of water helps to moderate earth's temperature?adhesionchohesionSpecific heat capacityLatent heat of vaporization
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