3 Flashcards
What are the 4 emergent properties of water?
- Cohesive (it sticks to itself) and adhesive (it sticks to other things)
- High specific heat and heat of vaporization
- Ice floats
- Versatile solvent
What are hydrogen bonds?
-The attraction between two polar molecules (not atoms)
-The positive hydrogen of one water molecule is attracted to the negative oxygen of a different water molecule (think magnets)
What is cohesion?
Water sticking together
What is adhesion?
Water sticking to other things
What is specific heat?
-The amount of heat that must be absorbed or lost to change the temperature of 1g of a substance by 1 degree
-Water has a particularly high specific heat because of hydrogen bonds
-this maintains Earth’s temperature
Why does ice float?
-When water freezes, it becomes less dense than liquid water.
-Hydrogen bonds basically get stiffer and longer, making water less dense, and allowing air to move around in there
-the lower the temperature, the LESS dense water is. The higher the temperature, the more dense it is
Why is water a universal solvent?
-Is a great solvent for anything that is polar. It is also good for ionic compounds.
-The positive and negative parts of water disassemble the positive and negative parts of the solute
What things don’t dissolve in water?
Non polar molecules (including fats, lipids, and all hydrocarbons)
pH Basic vs Acidic
Basic solutions have OH ions and acidic solutions have H ions and H30 ions
What is energy?
The capacity to do work
What is kinetic energy?
Energy in motion
What is thermal energy?
Total quantity of kinetic energy in RANDOM motion
What is temperature?
Average kinetic energy
What is a calorie?
Amount of thermal energy (heat) needed to raise or drop water by 1 degree Celsius
