Water Properties Quiz & Water Potential
Short Answer Questions:
1. Water is a liquid at room temperature. Explain why this is unusual and then explain why it
The weak, small hydrogen bonds hold water molecules together in their vast numbers for
a small fraction of a second. Slowing them down and bringing them close together hence
the liquid form under room temperature.
2. Water is transparent to light. Explain why this is biologically important.
Light is a major component of photosynthesis, therefore, transparency of water allows
light to pass through. In the process it undergoes spectral composition through
attenuation and altering enhancing the richness of the light.
3. How does water affect the shape of molecules?
Water has three atoms with an angle of 104.5 degrees between bonds that makes it a bent
molecule. These makes water molecules polar allowing it to form hydrogen bonds,
having a high surface tension and a very good solvent.
Negative Pressure potential Term for a negative pressure
Air bubbles that escape from a liquid under reduced pressure
Mass movement of molecules from one area to another
following a pressure gradient
Random movement of individual molecules from one area to
Collagen and fibronectin.
Integral proteins in the membrane that acts as a channel for
Movement of water up a thin tube
Substance dissolved in a solvent
Cohesion/Adhesion Matching: For each of the following, indicate if it is an example of cohesion
(C), adhesion (A), or both (B)
attraction of likes
attraction of unlikes
water molecules hydrogen bond to one another
water is absorbed by a paper towel
Cohesion and adhesion
water moves up a thin column
Calculation/Conversion Question: Megapascal is the metric unit for water potential. It is a
pressure unit. 1 MPa is approximately equal to 10 atmospheres or 10 bars or 147 pounds per
square inch. Convert the following.
Racing bicycle tire (120 psi) =
Automobile tire (35 psi) =
Typical plant cell pressure (0.5 MPa) =
Home plumbing pressure (30 psi) =
Water pressure under 15 feet (0.05 Mpa) =
Water Property Matching: Match each of the following with the appropriate property of water.
a. Density decreases on crystallization
e. High surface tension
b. Heat of fusion
d. Specific Heat
c. Heat of vaporization
f. Tensile strength
explains why people perspire and plants transpire
explains why desert plants are succulents
explains why raindrops are round
explains why water acts like it has a skin
explains why water can move up a thin tube
involved in cooling organisms
used by desperate farmers to protect fruit crops
from frost damage
water is a thermal buffer
water resists evaporation
water resists freezing
water resists temperature changes
Diffusion, Osmosis & Water Potential Quiz
What is the water potential (Ψw) of a beaker of pure water 0 MPa Pressure potential? 0 MPa
Solute potential? Negative of Ps value (- X Mpa)
Calculate the osmotic potential (Ψs) of a 2.4 molal sucrose solution at 24oC. Show your
Ψs = -i...
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