Pure Water
Odorless, Colorless, Tasteless
How can the presence of water be tested for?
Using blue cobalt chloride paper on a solution
Why do aquatic organisms need water?
To breathe and absorb essential elements.
How does fresh water turn into hardwater?
The water dissolves minerals when it flows over rocks.
Water with high mineral content
What are the melting and boiling points for water?
0 degrees Celsius for melting, 100 degrees Celsius for boiling
Why do we sweat?
Water removes heat when it evaporates, so it helps us cool down
What is the primary function of gill rakers?
Protect the gill's filaments from particles.
What is the result of leeching?
The soil becomes less fertile.
Why doesn't soap lather in hard water?
The soap reacts with the salts in the water to produce scum.
Why does ice float on water?
Ice is less dense than water because water expands before freezing
What happens to blue cobalt chloride paper when water is present?
What is the secondary function of gill rakers?
Alter the direction of water to the roof of the mouth and regulate the size of food particles consumed.
What happens during leaching?
Water dissolves minerals in the soil as it passes through the soil, taking the minerals deeper into the soil.
What is the difference between temporary and permanent water hardness?
The salts in temporary water hardness decompose while those in permanent water hardness do not.
Why does water have relatively high melting and boiling points?
Strong hydrogen bonds
What is surface tension?
How do aquatic organisms breathe?
They force water into their mouth and through their gills. Oxygen is absorbed and carbon dioxide is released by the capillaries in the gills when water passes through them.
What can water dissolve?
Ionic and polar covalent substances.
Where is temporarily hard water usually found?
Areas rich with limestone
What is specific heat capacity?
What causes the surface tension in water?
cohesive forces between the molecules caused by the strong hydrogen bonds
Where does gaseous exchange take place?
In the gill lamellae
Why is water a good solvent?
The polar nature of the water's molecules due to the unequal share of electrons between atoms and the molecule's asymmetrical shape.
Which salts cause permanent water hardness?
calcium/magnesium sulfates