U1L1: Water properties

Question 1

What are the three characteristics of water?

Answer 1

1) Water clings
2) Water absorbs thermal energy
3) Solid water is less dense then liquid water

Question 2

What is cohesion and its effect on water clinging?

Answer 2

Water molecules form hydrogen bonds with one another - causes high surface tension.

Question 3

What is adhesion and its effect on water clinging?

Answer 3

Water molecules form hydrogen bonds with other polar molecules - causes capillary action.

Question 4

How does waters high heat capacity affect its ability to absorb thermal energy?

Answer 4

Hydrogen bonding in water causes it to absorb alot of heat before its temp increases, and loose alot of heat before its temp decreases - causes temp modification in organisms.

Question 5

How does waters high heat capacity of vaporization affect its ability to absorb thermal energy?

Answer 5

Hydrogen bonding in water causes it to absorb alot of heat and vaporize into a gas - causes evaporative cooling.

Question 6

What is the property that explains why solid water is less dense then liquid water? Whats it effect?

Answer 6

Water has its highest density at 4C —> when water reaches below 0C, it forms a crystalline lattice structure that causes the hydrogen bonds within the water molecules to move further apart. This lowers the density of solid water - causes ice to float on water.