Water Flashcards
(15 cards)
What is the charge of a dipole
None
What does latent heat mean
Energy needed to change state
What is cohesion
Water molecules attract each other forming hydrogen bonds
What is surface tension
Cohesion at the surface
Why is water transparent
Doesn’t absorb in the wavelength range of visible light roughly 400-700 nn
Why is water a good solvent
Attracts charged particles, ions and other polar molecules which dissolve in water and then chemical reactions can take place in solution
How can water act as a transport medium
Water transports dissolves minerals in xylem
What is high specific heat capacity
Large amount of energy needed to raise its temp
-DUE to hydrogen bonds resisting an inc in kinetic energy
What’s an advantage of high specific heat capacity
Prevents large fluctuations, keeping aquatic habitats stable
Allows enzymes to work efficiently
Why is ice less dense than water
The hydrogen bonds when frozen form a lattice, holding the molecules further apart
What is the bond formed with other dipoles
Hydrogen
Significance of water being polar (ions and gases able to dissolve) for animals and plants
- Animals ->Respiration (plasma transports dissolved substances)
- Plants -> Respiration and Photosynthesis
Significance of water undergoing cohesion for animals and plants
- Allows insects (pond skaters’) body to be supported
- Allows water to be drawn up the xylem
Significance of high latent heat of vaporisation for animals and plants
- Animals -> Temperature control (panting and sweating)
- Plants -> Water evaporated from leaf surface
Significance of water being transparent
Lets aquatic plants photosynthesise effectively
