Structure of water + hydrogen bonding

Question 1

water is composed of what two elements? what is the ratio?

Answer 1

oxygen and hydrogen
1:2 ratio

Question 2

what is a covalent bond?

Answer 2

equal sharing of electrons between non-metals
-both octet is filled

Question 3

Covalent bonds can result in

Answer 3

polarity

Question 4

water molecule is polar bc..

Answer 4

a partially positive hydrogen and an negative oxygen

Question 5

what is a hydrogen bond?

Answer 5

a weak bond interaction between the negative and positive regions of two separate molecules/ Water can form hydrogen bonds with other water molecules or charge molecules

Question 6

Cohesion

Answer 6

When two of the SAME molecules form hydrogen bonds with each other.

eg. water molecules bonding together ( LIKE bond with LIKE)

Question 7

Adhesion

Answer 7

When two DIFFERENT molecules form hydrogen bonds with each other.

eg. and the walls of a xylem of a plant

Question 8

surface tension

Answer 8

is a result of increased hydrogen bonding forces between water molecule at the surface
eg, a water droplet on a penny, small insects and objects able to float on water

Question 9

Why does ice float?

Answer 9

water’s cohesive property allows for unique hydrogen bond interactions to occur when water is in a solid state, making ice ( solid water) less dense than liquid water

Question 10

high heat capacity

Answer 10

water’s cohesive property allows it to absorb a lot of thermal energy before changing chemical states, resisting sudden changes in temperature

Question 11

Capillary action

Answer 11

is a result of both adhesive and cohesive properties of water