1) System is the substance(s) that is going thru the change. The surrounding is everything else in the Universe.
2) Heat is a form of Energy. Unit of energy is Joules, BTU and calories.
3) Minimum amount of energy needed for a set of reactants to form a set of products.
4) Greater than
5) Temperature
6) Energy flow from a high temperature body to a lower temperature body until the temperatures are equal.
7) there is no energy, 0K (no movement energy), pure crystal/substance (no Entropy energy)
8) randomness or disorder
9) releases
10) If you do not have a Perfect crystal, then there is randomness in the system (which requires energy).THIS QUESTION IS NOT ON TEST
11) Relative temperature scale are based on a condition that can change (FP/BP of water)
12) Kelvin by 273
13) 293K for 20.°C (298K if 25°C)
14) Disagree since the energy is not LOST but just moved from the chemical reaction to the surroundings.
15) When all the reactants are together (including all PE reactant and Activated energy) just before they reorganize into the products.
15) Enthalpy is the energy that holds the substance together (example bonds), energy of movement (called Temp) and energy in the phase of the substance.