Chapter 3: Water and Life Flashcards
What is water and what is it composed of?
it is a small, polar molecule that has 2 H atoms and 1 O atom
What kind of bonds form between water molecules?
Hydrogen Bonds
What kind of charges does water have?
partial positive and negative charges
What are the 4 emergent properties of Water?
- Cohesion/ Adhesion:
- Low density
- High specific heat and heat vaporization
- Universal solvent
Define the following terms:
1. Cohesion:
2. Adhesion:
- ability of water to stick together or with other water molecules
- the ability of water to stick to other molecules that are not water.
What is surface tension?
it is a measure of difficulty in breaking the surface of liquid with force.
What do cohesion and adhesion create?
cohesion and adhesion create surface tension meaning it requires some amount of force to break the surface
What is density?
density is a measure of how tightly a material is packed together.
What does water adhere to?
water adheres to only polar and charged objects.
What is true about density of liquid water molecules?
they are highly packed and constantly forming and breaking new hydrogen bonds
What is true about density of solid water molecules?
they are less packed and form stable hydrogen bonds in a lattice structure
What causes ice to float in liquid water?
solid ice has a lower density than liquid water, causing ice to float in liquid water.
Define the following terms:
1. Kinetic Energy:
2. Temperature:
3. Thermal Energy:
1.a measure of energy in the form of motion
2. average kinetic energy, of molecules in a solution
3. the total kinetic energy of all molecules transferred as heat.
What is the relationship of temperature in relation to motion or AKE?
as temperature increases, so does the AKE meaning the particles move faster, and the opposite is true.
What is the relationship between temperature and thermal energy?
High temperature= high thermal energy/ avergae motion of molecules
Low temperature= low Thermal energy/
