13-1: Energy/Phase Changes Flashcards
1
Q
Thermodynamics definition
A
The study of energy and chemical processes
2
Q
J
A
- Joule
- Heats up 1/4 g of water by 1°C
- Equivalent to 1 kg m/s^2
3
Q
Chemical Energy
A
- also called Potential Energy
- Energy stored in chemical bonds
4
Q
Electrical Energy
A
- Energy from the movements of electrons
5
Q
Electromagnetic Energy
A
- Energy in electromagnetic waves
- examples: gamma, x-ray
6
Q
Nuclear Energy
A
- Nucleus
- Mass converted into energy
7
Q
Thermal Energy
A
- Energy from heat
- Heat flows from something hot to something cold
- Affected by temperature and amount of substance
8
Q
What letter is heat represented by? Uppercase or lowercase?
A
q
9
Q
Endothermic
A
- Absorption of heat
- Heat enters a system
- The surroundings get colder
10
Q
Exothermic
A
- Release of heat
- Heat leaves a system
- Surroundings get hotter
11
Q
Endothermic phase changes
A
- boiling
- sublimation
- melting
12
Q
Exothermic phase changes
A
- freezing
- condensation
- deposition
13
Q
Potential Energy
A
- Stored energy in the bonds
14
Q
Kinetic Energy
A
- Energy of motion (temperature)
15
Q
Heat Absorption Formula
A
- qH2O = mC△T
- qH2O = heat absorbed by water
- m = mass
- C = 4.18 (J / gT)
- △T = Change in temperature
