Chemistry Of Life 1A.1

Question 1

What is Cohesion?

Answer 1

water molecules stick with each other because of H-bonding that form between them

Question 2

What is cohesion responsible for?

Answer 2

-Long column of water being transported against gravity by tress.
-Movement of small organisms on water.

Question 3

What is Adhesion?

Answer 3

water molecules get attracted to other different molecule

Question 3

High surface tension

Answer 3

The attraction between the water molecules, including H-bonding, is greater than the attraction between the water molecules and air.

Question 4

Importance of High surface tension

Answer 4

-Help creatures to walk on water
-Slow down water loss in plant leaves through pores
-Small organisms that are adapted for life on top of the water surface

Question 5

What is Specific heat capacity?

Answer 5

Due to the hydrogen bonds between the water molecules, it has a high heat capacity so it needs a great amount of energy to increase its temperature and loses great amount of energy when the temperature decreases

Question 6

Importance of Specific heat capacity

Answer 6

-Living organisms can only reproduce and survive if their temperature is maintained
-Regulate internal body temperature

Question 7

Maximum Density of water

Answer 7

water particles expand when the temperature becomes less than 4degree Celcius, this decreases the density and makes it float. In frozen lakes, we find ice on the surface, while we find liquid water underneath.

Question 8

Importances of Maximum density of water

Answer 8

-It enables living organisms to live in seas and oceans
-Surface freezing work as an insulator to prevent the rest of water from freezing

Question 9

Why water cannot be compressed?

Answer 9

The molecules attract with each other, makes the molecules to stay very close together

Question 10

Properties of water

Answer 10

-universal solvent
-adhesion
-cohesion
-no compression
-high surface tension
-high specific heat capacity
-maximum density at 4degree celcius

Question 11

Why water is a polar covalent compound?

Answer 11

water is a polar covalent compound, due to the difference in electro-negativities of hydrogen and oxygen

Question 12

Water molecule

Answer 12

The positive end of one water molecule is attracted to the negative end of another water molecule

Question 13

Importances of universal solvent

Answer 13

-Used to transport nutrients and water around the body
-Help cells transport and use substances like oxygen