Water - structural properties

Question 1

high heat capacity

Answer 1

provides a heat transport system (by tranferring heat from cells where it is produced in respiration to your bodys surface where it is lost to the surroundings)

Question 2

high latent heat value of water provides

Answer 2

your body with a cooling system

Question 3

hpw doees water proviide life to aquatic organisms

Answer 3

provides an external environment

Question 4

how does waters properties as a good solvent assist in life

Answer 4

it provides a transport system for nutrients and soluble wastes around the body

Question 5

how does waters property as a reactant assist in life

Answer 5

it acts as a chemical reactant in photosynthesis and other chemical reactions needed to survive

Question 6

what are the properties of water that make it essential for life

Answer 6

high surface tension and cohesions, high heat capacity, high latent heat value, good solvent and reacttant

Question 7

how many hydrogen bonds can water foorm

Answer 7

up to four per molecule

Question 8

what type of compound is water

Answer 8

covalent molecular compound

Question 9

what gives water its unique properties

Answer 9

its abilityb to form up to four hydrogen bonds

Question 10

structural properties of water

Answer 10

realtively high melting and boiling poiint, cohesion, adhesion, expands upon freezing

Question 11

how does water compare to other group 16 hydrides

Answer 11

significantly higher melting and boiling point

Question 12

hydrides

Answer 12

compounds with hydrogen

Question 13

cohesion

Answer 13

water is attracted to water

Question 14

adhesion

Answer 14

water is attracted to other substances

Question 15

why does water have a high surface tension

Answer 15

due to its strog cohesive forces

Question 16

structure of ice

Answer 16

an open structure with 4 hydrogen bonds to 4 nearest neighbours, a rigid hexagonal lattice structure

Question 17

structure of liquid water

Answer 17

has approx 4.4 neighbours, contains looser hydrogen bonds between continously moving H2O molecules

Question 18

why does ice float on water

Answer 18

because it is less dense

Question 19

what makes ice less dense than liquid water

Answer 19

the strcture of the solid ice lattice leaves large voids in these structures/the molecules are more spaced out

Question 20

how are hydrogen bonds in water formed

Answer 20

by an electrostatic attraction between the partial positive charge on a hydrogen atom of one water molecule and the lone pair of electrons on the oxygen atom of a neighbourinh molecule

Question 21

formula to calculate density

Answer 21

density = mass (g) / volume (cm3)

Question 22

density unit

Answer 22

gcm-3