Chapter Three Flashcards
(37 cards)
Where do water properties arise from?
They originate from attractions betweenn oppositely charged poles of different water molecules
When are water hydrogen bonds the most fragile?
When is in its liquid form, they are only about 1/20 as strong as a covalent bond
What are water’s 4 emergent properties?
1) Cohesive behavior
2) Ability to moderate temperature
3) Expansion upon freezing
4) Versability as a solvent
What is the cohesion of water?
It a phenomenon thanks to water molecules are held together by hydrogen bonds
What does cohesion of water contribute to?
It contributes to the transportation of water and dissolved nutrients against the gravity in plants
What is the Adhesion?
It is the clinging of one substance to another
What is surface tension?
It is the measure of how difficult it is to stretch or break the surface of a liquid
What is water surface tension due to?
It is due to the asymmetry of hydrogen bonded water molecules and the air above, which isn’t bonded to the water 
What is thermal energy?
It is a specific kind of kinetic energy associated with the random movement of atoms or molecules
What is heat?
 it is the thermal energy in transfer from one body of matter to another
What is a calorie?
It is the amount of heat it takes to raise the temperature of 1 g of water by 1 degree
How many calories is a joul equal to?
It is equal to 0.239 cal
What is the specific heat of substance?
It is the amount of heat that must be as absorbed or lost for 1 g of that substance to to change its temperature by 1°C
What is water specific heat?
 it is 1 cal/g•°C
What is water specific heat role in the life?
In summer, the body’s temperature can rise by only few degrees. While in winter, it goes down by only few degrees
What is vaporization?
 it is the transformation from a liquid to a gas form
What is the heat of vaporization?
It is the quantity of heat a liquid must absorb for 1 g of it to be converted from the liquid to the gaseous your state 
How many calories are needed to evaporate 1 g of water at 25°C?
About 580 cal
Why does evaporative cooling occur?
It occures because the hottest molecules are the most likely to leave as gas. It is as if 100 fastest runners at a college transferred to another school; the average speed of the remaining students would decline
Why does ice float in water?
It floats because water is one of the few substances that are less dense as a solid than a liquid
Why Is Ice lower density than water very Important to life?
 Because if Ice sank, lakes, rivers, seas and oceans would froze solid
What is a solution?
It is a homogeneous mixture of two or more substances
What is called the dissolving agent of a solution?
It is called solvent
What is called the dissolved agent of a solution?
It is called solute
