Examen
ENSC FINAL EXAM 2024 | 237 QUESTIONS | WITH ACTUAL SOLUTIONS!!
ENSC FINAL EXAM 2024 | 237 QUESTIONS | WITH ACTUAL SOLUTIONS!!
[Montrer plus]
Aperçu du contenu
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
Les avantages d'acheter des résumés chez Stuvia:
Qualité garantie par les avis des clients
Les clients de Stuvia ont évalués plus de 700 000 résumés. C'est comme ça que vous savez que vous achetez les meilleurs documents.
L’achat facile et rapide
Vous pouvez payer rapidement avec iDeal, carte de crédit ou Stuvia-crédit pour les résumés. Il n'y a pas d'adhésion nécessaire.
Focus sur l’essentiel
Vos camarades écrivent eux-mêmes les notes d’étude, c’est pourquoi les documents sont toujours fiables et à jour. Cela garantit que vous arrivez rapidement au coeur du matériel.
Foire aux questions
Qu'est-ce que j'obtiens en achetant ce document ?
Vous obtenez un PDF, disponible immédiatement après votre achat. Le document acheté est accessible à tout moment, n'importe où et indéfiniment via votre profil.
Garantie de remboursement : comment ça marche ?
Notre garantie de satisfaction garantit que vous trouverez toujours un document d'étude qui vous convient. Vous remplissez un formulaire et notre équipe du service client s'occupe du reste.
Auprès de qui est-ce que j'achète ce résumé ?
Stuvia est une place de marché. Alors, vous n'achetez donc pas ce document chez nous, mais auprès du vendeur EvaTee. Stuvia facilite les paiements au vendeur.
Est-ce que j'aurai un abonnement?
Non, vous n'achetez ce résumé que pour 23,53 €. Vous n'êtes lié à rien après votre achat.
Peut-on faire confiance à Stuvia ?
4.6 étoiles sur Google & Trustpilot (+1000 avis)
56326 résumés ont été vendus ces 30 derniers jours
Fondée en 2010, la référence pour acheter des résumés depuis déjà 14 ans