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Bio chapter 3

Terms in this set (15)

Differentiate between cohesion and adhesion
Cohesion: water molecules stick to other water molecules by hydrogen bonding. Cohesion helps the transport of water against gravity in plants

Adhesion: is an attraction between different substances, for example, between water and plant cell walls.
Explain surface tension
Is a measure of how hard it is to break the surface of a liquid- BC cohesion.

Adhesion causes water to adhere to glass and other surfaces.
Describe the properties of water that are important for life
1. Cohesive behavior
2. Ability to moderate temp.
3. Expansion upon freezing
4. Versatility as a solvent
Explain the difference between specific heat and heat of vaporization.
Water has a high specific heat which means that there is a large amt of energy required to change the temp.
And high heat of vaporization is the evaporation of water from a surface causing cooling of that surface.
Is ice more or less dense than water? Why is this important and how does it happen?
Ice is less dense. This is because the hydrogen bonds in ice are more ordered. This is important because if ice sank, life would be impossible.
What is a solution?
A liquid that is a homogenous mixture of substances
Why is water an effective solvent?
Water is a versatile solvent due to its polarity (forms hydrogen bonds easily)
Why doesn't oil mix with water?
BC it is hydrophobic so it doesn't have an affinity with water. They have nonpolar bonds.
Differentiate between hydrophobic and hydrophilic substances.
Hydrophilic- water loving /polar or ionic

Hydrophobic- water hating/ non polar
Why is hydrogen bonding an amazing phenomenon? What are keg biological examples of hydrogen bonding?
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Explain the dissociation of water.
Water molecules dissociate at the same rate at which they reform.
What is the difference bw an acid and a base?
An acid is any substance that increases the H+ concentration of a solution

A base is any substance that reduces the H+ Concentration of a solution
Explain how the pH scale works
A pH scale is set up in order of how acidic, neutral, or basic the solution is.
The pH scale is logarithmic, what's this mean and whys it important?
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Explain how buffers work to regulate pH.
Buffers are substances that minimize changes in concentrations of H+ and OH- in a solution.
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