Chapter 3- Water Flashcards
Polar molecule
Unequal sharing of electrons so charges an equally distributed
True or false. Bonds are very fragile in the water state and often breaks in bonds to neighbors.
True
Are the four emergent properties of water that contribute to the earth’s suitability for life?
Cohesive behavior, ability to moderate temperature, expansion when frozen, and important as a solvent
Cohesion
The linkage and hydrogen bonds which makes it more structured and holds the substance together
Adhesion
Clinking of one substance to another
Surface Tension
Measure of how difficult it is to stretch or break the surface of a liquid
Is the surface tension of water high or low and why?
High and because of strong hydrogen bonds
Adoration of the temperature of water
Water moderate air temperature by working the heat and releasing cooler air, also reverses without slight change of temperature
Kinetic Energy
Energy of movement
Thermal energy
KE and movement of atoms, depends on volume
Temperature
Measure of energy and represents average kinetic energy of a molecule, movement increases with heat
Heat
Thermal energy in transferred from one to another
Calorie
Heat takes to raise 1 g of water to 1°C
Joule
Measures energy
Water have a high specific heat?
Yes. It stabilizes heat because of the high specific heat and when it does change it absorbs or loses relatively large quantity of heat each degree change
Specific Heat
Amount of heat that must be absorbed or lost for 1g to change the temperature 1°C, how well it resist change in temperature when it absorbs or releases heat
What makes water have high specific heat?
Hydrogen bonds, when the bonds break it up towards heat and when they form it releases heat, small change in waters temperature because most heat is used to disrupt hydrogen bonds for water molecules move faster to heat up
Heat of evaporation
Quantity of heat a liquid must absorb for 1 g of it to change from a liquid to a gas
Evaporative cooling
Liquid evaporates, surface of the liquid remains behind equals which stabilizes the temperature
Why does water float on ice?
Because it is less dense
Transiently
Hydrogen bonds breaking and reforming constantly
Homogeneous
Same everywhere in the mixture
Solution
Two or more substances
Solvent
Dissolving agent
Solute
Dissolves
Aqueous solution
Solute dissolves in water
Hydration shell
Sphere of H2O molecules around each dissolved ion
Hydrophilic
Water loving, absorbs water
Hydrophobic
Non-ionic and polar, repels water
What type of molecule is a water molecule?
Polar
Polarity
Unequal sharing of electrons
Where do most H2O properties come from? Name a few.
Polarity, surface tension, expand when frozen=less dense, cohesion, adhesion, and insulators
What are the 4 main elements in our body?
CHON
What are the minor ones?
PCaSK
What effects the behavior of an atom?
Number of electrons in the valence she’ll
True or false. Elements in the same column have same valence and similar chemical properties.
True
Are Hydrogens bonds weak or strong?
Weak
What are the strong bonds?
Covalent bonds
Why are covalent bonds strong?
1) two atoms share pair of electrons
2) both holds onto it
3) very stable
What do more bonds mean?
Stronger
What is SPONCHCF
Sulfur phosphorus oxygen nitrogen carbon hydrogen calcium iron
