Water Flashcards
(17 cards)
What is the most crucial molecule for life on Earth?
The most crucial molecule for life on Earth is water.
What type of molecule is water?
Water is a polar molecule.
What types of bonds can water form?
Water can form high polar-covalent bonds and hydrogen bonds.
What are the three states of water?
Water’s three states are liquid: which is where the hydrogen bonds are constantly being broken and made, gas: which is where water is heated up and has increased kinetic energy–hydrogen bonds break and escape into the air, and solid: which is where where tempt. is low and crystalline structure is maintained–packed tightly together.
What happens if the water in our cells freezes?
If the water in our cells freezes, they die (cell death).
What is water’s specific heat capacity?
Water’s specific heat capacity is the amount of heated needed to absorb in order to raise its temperature one-degree centigrade.
What is heat of vaporization (of water)?
The heat of vaporization is the amount of energy required to change one gram of liquid (water) into gas.
What is a solution?
A solution is a mixture of different molecules.
Which molecules dissolve in water: hydrophilic or hydrophobic?
Hydrophilic molecules dissolve in water, whereas hydrophobic molecules do not.
What is cohesion?
Cohesion is the attraction between like molecules.
What is adhesion?
Adhesion is the attraction between unlike molecules.
What is surface tension?
Cohesive forces cause like molecules at the surface of a liquid to be attracted to each other, and the attraction at the surface of these like molecules is surface tension.
What is an acid?
An acid is a substance that gives up a proton during a chemical reaction.
What increases in a solution when an acid is added?
When an acid is added to a solution the proton concentration increases.
What is a base?
A base is a substance that acquires protons.
What decreases in a solution when a base is added?
When a base is added to a solution the proton concentration decreases.
What are buffers?
Buffers are weak acids or bases that are used to maintain near-neutral pH in organisms.
