Examen
ENSC FINAL EXAM 2024 | 237 QUESTIONS | WITH ACTUAL SOLUTIONS!!
ENSC FINAL EXAM 2024 | 237 QUESTIONS | WITH ACTUAL SOLUTIONS!!
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ENSC FINAL EXAM 2024 | 237 QUESTIONS |WITH ACTUAL SOLUTIONS!!
What is the chemical composition of water? Answer - H2O-- two atoms of
hydrogen bonded to single atom of oxygen-- one molecule
What type of bond holds together the atoms in a water molecule? Answer -
Covalent bond
Which bond holds together multiple water molecules? Answer - hydrogen
bond
Which of the two bonds is stronger? covalent or hydrogen
why? Answer - Covalent bond; Have to stick together whereas hydrogen bond
is more temporary association -can break apart
hydrogen bond Answer -
solid, liquid, gas
which property Answer - state of water
properties of water include Answer - hydrogen bond, state of water, high heat
capacity, universal solvent, adhesion/cohesion/surface tension
means any liquid can dissolve solids Answer - universal solvent
,how is a hydrogen bond formed Answer - A hydrogen bond is formed between
2 polar molecules. The hydrogen atom from one polar molecule is attracted to
an electronegative atom of another polar molecule.
Is the hydrogen bond between atoms or molecules? Answer - molecules
How many hydrogen bonds can a single water molecule form? Answer - 4
examples of the three states of water Answer - solid -ice; liquid- water; gas-
water vapor
which state of water is most dense Answer - liquid
particles in different states of water Answer -
The amount of heat one gram of a substance must absorb or lose to change
temperature by 1 degrees celsius Answer - high heat capacity
amount of energy needed to change temp of one gram of water? Answer -
calorie
Why does water have high heat capacity? Answer - hydrogen bonds
t or f
*All the special properties of water are due to hydrogen bonds* Answer - t
How does having a high heat capacity benefit living organisms? Answer - Helps
maintain a constant internal temperature (homeostasis)
,water has a high heat of _______________ Answer - vaporization
Amount of energy a substance needs to absorb in order to change into a vapor
Answer - heat of vaporization
For the planet as a whole, what is the significance of a high heat of vaporization
for water? Answer - as temp increases the amount of substance an organism
needs goes down
Water has a high heat of vaporization compared to other liquids-- needs to
absorb a lot of energy before turning from liquid to vapor Answer -
How else does heat of vaporization benefit living organisms like us? Answer -
cools us down
What kinds of substances can dissolve in water and why? Answer - A lot-- thats
why its called universal
Ionic substances
Polar molecules(dissolves)
How does this property of water benefit living organisms? Answer - Removes
wastes
Most nutrients will dissolve in water(blood) -- as it flows through the body it
supplies nutrients to the cells
Transport nutrients and remove waste products
water molecule attached to another through hydrogen bonds
, In this case it is not attached to another water molecule but other things
Answer - cohesion
What other property of water is the result of cohesion Answer - surface
tension
What causes all these characteristics in water? Answer - hydrogen bonds
How does cohesoin/adhesion property of water benefit humans? Answer -
muscle movement helping blood move along that is mostly made up of water
which helps it all stay together
How does cohesoin/adhesion property of water benefit other living organisms?
Answer - plants(trees)-- stick to vessel and allow everything to flow while going
against gravity
hydrogen bonding - what is it and why is it important? Answer - Equal sharing
of electrons -- results in polar molecule (has positive and negative pull)
When it is not equal that is what causes hydrogen bond
Three physical states - which ones are they and how do their densities
compare? Answer - Most dense- liquid
Least dense- gas
Solid
universal solvent - which property of water makes this possible and what is the
significance of this to living organisms? Answer - Nutrients get dissolved in
blood and transported around the body
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