Water

Question 1

what % of water makes up the total body weight of living things

Answer 1

60% - 70%

Question 2

what kind of compound is H2O have (ionic, polar, or covalent)

Answer 2

polar w/ H w slightly pos charge and o w slightly neg charge

Question 3

what % of water is in our blood

Answer 3

92%

Question 4

what kind of bonding does H2O have in connecting atoms within the molecule?

Answer 4

intramolecular bonding

Question 4

what is intermolec. bonding?

Answer 4

bonding with other molecules
ex. hydrogen bonding

Question 5

what is intramole. bonding?

Answer 5

bonding of atoms within molecule
ex. ionic, covalent, polar

Question 6

water is a liquid at room temp until ___ celcius

Answer 6

100 celcius

Question 7

what bonds keep water a liquid form?

Answer 7

hydrogen bonding

Question 8

what is a solventv

Answer 8

a substance that can dissolve another substance (more abundant)

Question 9

what is a solute

Answer 9

a dissolved substance (less abundant)

Question 10

hydrophilic molecules and ions are polar molecules that interact with water, so how do they react?

Answer 10

readily dissolve w/ water

Question 11

hydrophobic molecules and ions are non-polar molecules that interact with water, so how do they react?

Answer 11

dont dissolve/only slightly

Question 12

water is cohesive, why?

Answer 12

H bonding makes water molecules cling tgt and flow

Question 13

hwats the diff between adhesion and cohesion

Answer 13

ad = clinging of unlike molecules
co = clinging of like molecules

Question 14

describe water’s specific HIGH HEAT CAPACITY. why does water take so long to heat up and so long to cool down. and how does it help humans maintain homeostasis?

Answer 14

H bonds restrain bouncing in molecules when reacting to high temps so it can absorb a lot of heat before the temp changes

92% of water maintains body temperature for homeostasis = resistant to high/low temps

Question 15

what is a calorie when we talk about temperature changes

Answer 15

the energy it takes to raise temp of 1 g H2O/1 celcius

Question 16

how do hydrogen bonds react when water evaporate into gas?

Answer 16

a LARGE NUMBER of H bonds break when water evaporates

Question 17

what temp (celcius) is water the densest?

Answer 17

4 celcius

Question 18

when temps reach lower than 4 celcius:
a) how do hydrogen bonds become?
b) are the molecules further or closer apart?

Answer 18

a) more rigid
b) further

Question 19

explain why ice is less dense than water

Answer 19

@ temps lower than 4 celcius, the molecules are further away, which means theres empty space –> this explains why ice floats in water BC ice is less dense