Flashcards in Week 5 Deck (32)
Water is ...
A universal solvent, because it's polar. It can rip anything that is ionicly bonded apart.
This means that when an ionic substance is place in water, the water molecules pull the positive and negative ions apart from each other. When this happens the ionic bonds of the compounds break and as a result the particles wander within the water.
Water is used as our main solvent.
Chemicals added to water
Positive ends of the water molecule surround negatively charged molecules.
Water is an ideal transport medium. Blanketing property of water allows molecules in the water to move around freely and to be cushioned from each other.
Blood is ...
A suspension = 70% water
Urine is ...
A solution (water carries waste products).
We need water for ...
With dehydration you are more likely to get ...
The SAME will dissolve (polar and polar dissolve better)
for bonding (opposites attract)
Water has a high heat capacity
Boiling point goes down when salt is added. Boiling point at normal elevations 217F.
As a substance water can contain a lot of heat.
Ability to contain heat
Water helps maintain you ...
Water is a great ...
Water helps with ...
Adding salt to water
When salt breaks hydrogen bonds ...
It lowers the boiling and freezing point (salt on ice).
Water when frozen gets...
bigger (molecules slow down, density decreases).
Water decreases in density when frozen (more space within, crystal lattice, Hydrogens pop out, from crystals. That's why ice floats).
Hydrogen bond makes it pop out, creating a definite order (-crystals).
Salts are ...
minerals in body either stored or used and ionicly bonded. Water is a great carrier of minerals.
Anything ending in -ate ...
e.g. phosphate = phosphorus + oxygen
Calcium phosphate is also a salt.
What are salts in an ionic form called?
Electrolytes (aids with transmission of nerve impulses)
Ions help us with our charges.
Only happens with ionization!
Na + Cl = Na(+)CL(-)
Na = oxidized loss of an electron (-)
Cl = reduced gain of an electron (+)
NaCl = Redox
Means losing an electron (ionic bond)
Means gaining an electron (ionic bond)
Acids are ionicly bonded, when you add them to water they release H+.
They ionize the solution.
Acid is a proton donor (H+ donor).
Base ionizes with hydroxyl molecules (OH-).
They are proton acceptors.
Hydroxyl ions are attracted to H+ ions to form water.
Acids and bases are also ...
Electrolytes. When they're in water, they ionize.
Above 7 = alkaline, basic environment
Below 7 = acidic environment