A1.1 & D2.3.1 Water

Question 1

Cohesion between water

Answer 1

They are strongly cohesive and stick to one another, this is because of its large number of hydrogen bonds (surface tension)

Question 2

Adhesion in water

Answer 2

Stick to other polar or charged molecules, large number of hydrogen bonds gives it strength

Question 3

Capillary action in water

Answer 3

Water sticks to the sides of xylem vessels, moving the water upwards when the vessel is empty

Question 4

Solvent properties of water

Answer 4

The polar attraction of large quantities of water can interrupt intra-molecular forces, the polar end will take one solvent and the non polar will take another

Question 5

How does buoyancy work?

Answer 5

Fluid exerts an upward force on the object, if the density of the object is larger than the density of the fluid it will sink

Question 6

What impacts viscosity

Answer 6

solutes in the fluid

Question 7

Thermal conductivity in water

Answer 7

Water has a high heat conductivity, then fats and oils, then air
therefore aquatic animals lose heat in water

Question 8

What is specific heat capacity?

Answer 8

The heat required to raise the temperature of 1g of material by 1 degree C

Question 9

Specific heat capacity of water vs air

Answer 9

It takes a lot of energy for water yo change temp compared to air. Water can therefore be used to cool off.

Question 10

What is a hydration shell?

Answer 10

when solutes dissolve they develop a hydration shell