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- 1. Multiple Choice
What is the chemical formula for water?
HO
2HO
H2O
HO2
- 2. Multiple Choice
Refer to the picture; the meniscus is occurring because of:
Adhesion
Cohesion
- 3. Multiple Choice
Refer to the picture; the water is sticking to the spider web because of:
Adhesion
Cohesion
- 4. Multiple Choice
Describe COHESION.
Water molecules attracted to other substances.
Water molecules climbing upwards against the force of gravity.
Water molecules dissolving many substances because of its polarity.
Water molecules attracted to other water molecules.
- 5. Multiple Choice
Describe ADHESION.
Water molecules attracted to other substances.
Water molecules climbing upwards against the force of gravity.
Water molecules dissolving many substances because of its polarity.
Water molecules attracted to other water molecules.
- 6. Multiple ChoiceWhat two elements make up water?Helium and oxygenHydrogen and oxygenhelium and carbonoxygen and carbon
- 7. Multiple Choice
Attractions between water molecules are called
Covalent bonds
Ionic bonds
Polar bonds
Hydrogen bonds
- 8. Multiple Choice
Why does ice float?
As water freezes, the molecules move farther apart and its density decreases.
As water freezes, it takes up more hydrogen from the atmosphere
As water freezes, air becomes trapped between the water molecules.
As water freezes, it takes up more oxygen from the atmosphere
- 9. Multiple Choice
How many hydrogens are in THREE molecule of H2O?
2
3
4
6
- 10. Multiple Choice
Why can water striders walk across the surface of water without falling through?
They are light enough so they don't break the hydrogen bonds holding the water molecules together
The insects actually use their wings to hover slightly above the water’s surface
The insect’s feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water’s surface.
The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next
- 11. Multiple ChoiceTrue or false water is a polar molecule?TrueFalse
- 12. Multiple Choice
Which end of the water molecule has a slightly positive charge?
the oxygen end
the hydrogen end
both ends are slightly positive
neither end is positive
- 13. Multiple Choice
Which term refers to water having a slightly positive and a slighty negative charge on its ends?
cohesion
surface tension
polar
adhesion
- 14. Multiple Choice
Why does water moderate temperature so well?
It does not allow heat in between the hydrogen bonds.
More energy is needed to break all the hydrogen bonds, or rebuild them, between water molecules.
Water has high energy all the time, so it can't heat up any more.
The polarity of the water molecule resists the added energy, causing water to stay the same temperature.
- 15. Multiple Choice
Refer to the picture; the water droplets are sticking to the leaf because of:
Adhesion
Cohesion
- 16. Multiple Choice
Refer to the picture; the insect is not falling through the water because of:
Adhesion
Cohesion
- 17. Multiple Choice
Which end of the water molecule has a slightly negative charge?
the oxygen end
the hydrogen end
both ends are slightly negative
neither end is negative
- 18. Multiple Choice
Why is water so good at dissolving so many substances?
it is polar
it is less dense as a solid
cohesion
adhesion
- 19. Multiple ChoicePaper clips are able to float on water because of ....adhesioncapillary actionsurface tensionuniversal solvent
- 20. Multiple ChoiceSurface tension is caused by ...strong cohesion between water moleculesstrong adhesion between the water moleculescondensationwater cycle
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