Properties of water + hydrogen bonding

Question 1

what are water molecules

Answer 1

polar covalent, as oxygen is slightly more negative than hydrogen

Question 2

what bond will form between water molecules

Answer 2

hydrogen bond

Question 3

what bond will form in side of water (between oxygen and hydrogen)

Answer 3

covalent

Question 4

what results to polar covalent bonding

Answer 4

unequal sharing of electrons

Question 5

why is water cohesive

Answer 5

• hydrogen bonds between the water molecules make them stick together
• polarity

Question 6

what is cohesion

Answer 6

when the same type of molecules are attracted to each other

Question 7

what does water’s cohesive properties explain

Answer 7

• WHY WATER IS ALLOWED TO ACT AS A TRANSPORT MEDIUM FOR DISSOLVED SUBSTANCES AND NON POLAR SUBSTANCES
• SURFACE TENSION

why water forms into droplets when its split

• why water has a surface tension that allows some organisms to walk to water
• how water is able to move as a water column in the vascular tissues of plants

Question 8

what is adhesion

Answer 8

any attraction between two unlike molecules

Question 9

why does water have adhesive properties

Answer 9

• because of the hydrogen bonding and polarity of water
• water tends to stick to other polar substances with hydrogen bonds
  EXAMPLE: makes water a good transport medium and SOLUBLE

Question 10

what are common uses of water

Answer 10

• coolant
• surface tension
• transport medium
• medium for metabolic reactions

Question 11

why does water have thermal properties

Answer 11

• high specific heat capacity (large amount of heat required to cause an increase in temperature
• high latent heat of vaporization ( a large amount of heat energy required to evaporate water)
• water can absorb a lot of heat during evaporation

Question 12

why are water’s thermal properties important

Answer 12

• temperature stabilization in living organisms
• used as a cooling mechanism
• coolant/sweating
• can absorb thermal energy as a byproduct of chemical reactions
• so that the oceans don’t evaporate

Question 13

what are waters solvent molecules

Answer 13

• water is a solvent of POLAR substances

- like dissolves like

Question 14

why are waters solvent properties important

Answer 14

• can dissolve organic and inorganic substances to facilitate chemical reactions

Question 15

why can water transport well

Answer 15

because of its solvent properties

Question 16

how does solubility in water affect the mode of transport of molecules in organisms

Answer 16

• because of their different polarities, each type of substance has a different solubility
• water acts as a mode of transport

Question 17

molecules

Answer 17

• glucose
• amino acids
• cholesterol
• fats
• oxygen
• sodium chloride in blood

Question 18

how does glucose convey with water

Answer 18

• it a polar moleculle= high solubility

Question 19

amino acids + water

Answer 19

• varying polarity but reasonability soluble

Question 20

chlorestol and water

Answer 20

• non polar, therefore low solubility

Question 21

fats

Answer 21

non polar= low solupbility

Question 22

oxygen

Answer 22

low solubility, travel as diatomic O2

Question 23

sodium chloride

Answer 23

high solubility, its ionizes in water and separates into Na+ and Cl- in an aqueous plasma

Question 24

HOW do the non soluble molecules travel in water

Answer 24

= through blood proteins that have polar amino acids on the portion to give water solubility and non polar amino acids to pint to the non polar molecules (like the cell membrane)

Question 25

what does hydrophobic mean

Answer 25

water fearing

Question 26

what does hydrophilic mean

Answer 26

water loving

Question 27

thermal properties of water VS methane

Answer 27

• methane is non polar, so it will not dissolve in water
• its hydrophobic
• its a hydrocarbon
• low specific heat capacity
• low latent heat of vapourization
• low melting and boiling point