Water Flashcards

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1
Q

Is hydrogen or oxygen delta negative?

A

Oxygen - Delta Negative
Hydrogen - Delta Positive

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2
Q

Why is oxygen delta negative?

A

There is an unequal share of electrons, and they lean towards oxygen

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3
Q

What is a polar molecule?

A

A molecule with regions of positivity and negativity

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4
Q

Why are hydrogen bonds drawn as a dotted line?

A

They are weak bonds individually

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5
Q

Water is a solvent. What does this mean and what is the importance of it?

A
  • It can dissolve substances
    Importance - It can dissolve polar molecules like glucose but not non-polar molecules
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6
Q

What are the important functions of water?

A
  • Solvent
  • Medium for chemical reactions
  • Transport medium
  • Coolant
  • Habitat
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7
Q

Where is water a transport medium for in animals and plants?

A

Animals - Blood
Plants - Xylem (transports water and mineral ions)
- Phloem (transports dissolved sugars)

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8
Q

What is a transpiration stream, and how does it rely on hydrogen bonds?

A
  • The movement of water up a xylem
  • Cohesion between the water molecules
  • Adhesion between a water molecule and the xylem surface
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9
Q

What is cohesion and adhesion?

A

Cohesion - The attraction between the same type of molecule
Adhesion - The ability of a substance to bind to a different/unlike molecule

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