THERMOCHEMISTRY (PART 1) Flashcards
1
Q
- What is energy?
A
- it is the capacity to supply heat
- it is the capacity to do work
2
Q
- What are the two basic types of Energy?
A
- Kinetic Energy
- Potential Energy
3
Q
- What is Kinetic Energy?
A
- this is the energy of motion
4
Q
- What is Potential Energy?
A
- this is the stored energy
- it is the potential to do work
5
Q
- What are some examples of Potential Energy?
A
- gravitational energy
- elastic energy
- electromagnetic energy
- nuclear energy
- chemical energy
- mechanical energy
- thermal energy
6
Q
- What does Mechanical Energy equate to?
A
Kinetic Energy + Potential Energy = constant
THIS MEANS THAT:
- an increase in kinetic energy results in a decrease in
potential energy
- this is true for an isolated system and vice versa
7
Q
- What is the First Law of Thermodynamics?
A
- it is also known as the Law of Conservation of Energy
- energy is neither created nor destroyed
- this energy can be converted from one form to another
8
Q
- How do we mathematically calculate Gravitational Potential Energy?
A
9
Q
- How is a Roller Coaster an example of the First Law of Thermodynamics?
A
- the system is isolated
- the Mechanical Energy is conserved and kept constant
- an increase in the Gravitational Potential Energy of
the system results in a decrease in the Kinetic Energy
of the system
WHEN THE ROLLER COASTER IS AT MAXIMUM SPEED:
- the potential energy is at it’s minimum
10
Q
- What happens to the other energies present in the system when the Roller Coaster is at Maximum Height?
A
- the potential energy is at a maximum
- the kinetic energy is at its minimum
- the roller coaster is moving very slowly
11
Q
- What happens to the energies in the system when the Roller Coaster starts moving downwards?
A
- the potential energy decreases
- the heigh decreases
- the speed picks up
- the kinetic energy increases
12
Q
- What happens to the energies in the system when the Roller Coaster reaches its lowest?
A
- the kinetic energy is maximised
- the potential energy is minimised
13
Q
- What happens to the energies in the system when the Roller Coaster starts climbing again?
A
- the speed decreases
- the kinetic energy drops
- the height increases
- the potential energy increases
14
Q
- What happens to the energies in the system at all the points in the Roller Coaster?
A
- the sum of the potential and the kinetic energies is
constant
15
Q
- How does a Thermometer work?
A
- the air molecules collide with the bulb
- the heat is created from the collisions
- the liquid in the bulb expands when heated
- this allows for you to read the temperature