In general
Energy
The ability to do work
Potential Energy=... what is an example of this?
Stored energy (stored in bonds between atoms). Examples: in food, gasoline (C8H18).
Mole vs Mol
Mole=full name
Mol=unit
Comparison example: gram vs g
Endothermic Change
The system absorbs heat. Example: beaker feels cold, ice melting, increase in potential energy, breaking a chemical bond (bonds are very stable and require some energy to destroy a bond)
Kinetic Energy
The energy of motion. Translating, and rotating of particles. As the temperature increases, the kinetic energy decreases.
Scientific Notation Rule
ax times 10^b
a must be smaller than 10
The Mole
The mole is the SI unit for "amount of substance"
1 mole=molar mass (can be found on periodic table)
1 mole = 6.02 times 10^23 atoms for elements
1 mole = 6.02 times 10^23 compounds for atoms
Exothermic Change
The system releases heat. Example: beaker feels hot, paper burning, decrease in PE, forming a chemical bond.
Law of Conversation of Energy
E after = E before. Example: An amount of energy before and after an experiment should be the same. Reactant to product.
Should you always write units?
Yes
Elements=
Compound=
Elements=atoms
Compound=molecule
Physical Changes for exothermic and endothermic
Exothermic- gas to liquid to solid
Endothermic- solid to liquid to gas
Energy Changes
Endothermic Change and Exothermic Change