water

What are the properties of water ?

• universal solvent

• has high specific heat capacity

• has high latent heat vaporization

• has minimum density at 4°C

What is the shape of one water molecule?

• V shape with angle 104.5°

• Y shape with angle 104.5°

• V shape with angle 90°

• Y shape with angle 90°

Why does water molecule has opposite charges on opposite ends ?

• Due to unequal distribution of shared electrons

• Due to same distribution of shared electrons

• Due to different hydrogen placement

• Due to electronegativity in the surrounding

How many hydrogen bond formed with one water molecule

• 1

• 2

• 3

• 4

Define cohesion

• force of attraction between the water molecules

• the hydrogen bonding between water molecules

• hydrogen bond to the molecules of the cell walls helps counter the downward pull of gravity

• A chemical bond that formed when the partially positive H of one molecule is attractive to the partially negative oxygen in another water molecule

What happen to water molecule at 0°C ?

• water molecule crystallize

• the water molecule become locked into crystalline lattice , each water molecule hydrogen bonded to four partner

what is the bond between hydrogen and oxygen ?

• ionic bond

• hydrogen bond

• covalent bond

Choice the correct statement

• large amount of heat energy is absorbed to break ALL hydrogen bond between water molecules in order to increase the temperature of water molecules

• larger amount of heat is absorbed to form ALL hydrogen bond between water molecules in order to increase temperature of water molecules

• large amounts of heat energy is released to form hydrogen bond between water molecules in order to decrease the temperature of water molecules

Fill in the box with the correct answer

• H+

• H-

• O+

• O-

Why is water important as a universal solvent

• is a major transport medium in living organism

• stabilises solutions to prevent breaking of molecules

• supplies an aqueous medium in biochemical reactions

• various types of substance can be dissolved