Fundementals of Biology Chapter 3 quiz 2
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40 Terms
1.4
What is the difference of electronegativity for oxygen and hydrogen in water?
Polar covalent
What kind of bonds are in water molecules?
A large % of all living things is made up of H20
¾ of the earth is covered by water
Life originated in water
All the chemical reactions of life take place in water
Water occurs in all three states under natural conditions
What are 5 facts about water?
65%
Adult humans are what % of water?
78%
Plants are what % of water?
95%
Jelly fish are what % of water?
1. solid
Liquid
Gas
What are the three States water can be in?
Hydrogen bondS
What causes the properties of water?
Ability to moderate temperature
Ice floating
Ability to act as a solvent
Cohesion
Adhesion
Capillary action
pH
What are the properties of water?
Specific heat
Amount of energy needed to raise the temperature of 1 gram of substance 1 °C
1 calorie
Specific heat of water
Regulate the climate by providing environments for living things
The specific heat of water helps to what?
Needs to break hydrogen bonds before molecules can be used
Why does water have a high specific heat?
Heat of vaporization
Amount of energy needed to convert 1 gram of substance from a liquid to a gas
Heat of vaporization of water
540 calories
Specific heat & heat of reaction
How does water moderate temperature?
Because of hydrogen bonding in the solid form but when a liquid, could be denser than if it were a solid
Why does ice float?
B/c it gives living things a place to live / allows them to live farther north
Why is ice being able to float important?
Chlorine ion is attracted to partial positive of hydrogen & Na ion is attracted to partial negative of oxygen
Why does salt dissolve in water?
Cohesion
To stick together / attraction b/n like molecules
Hydrogen bonds
What causes cohesion b/n water molecules?
Surface tension
What does cohesion cause?
To stick
What is "Hesion” mean?
Adhesion
The tendency of dissimilar particles to cling to one another
Water striders on surface of water
What is an example of cohesion ?
Water between 2 pieces of glass & it is hard to move them
What is an example of adhesion?
Polar
Glass is ?
Capillary action
a combination of .cohesion & adhesion
Trees pulling water up their trunks
What is an example of capillary action?
Meniscus
Greek for crescent
pH
The measure of hydrogen ion concentration
Two
_____ out of a billion water molecules dissociate
A log scale
The pH scale=
Take the negative log
The p in pH =
7.2 - 7.4
What is the normal blood pH?
A coma
What happens when pH reaches 6.95 in the human body ?
Convulsions
What happens when pH reaches 7.7 in the human body ?
Vacuole contents are more acidic
In plants, what does a red color indicate?
That vacuole is more basic
In plants, what does a blue color indicate?
B/c the color dedicated by pH attracts certain types of pollinators
Why does pH matter in plants?
Note 
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