Lesson 3: Internal energy Flashcards
1
Q
What is thermal energy?
A
- Thermal energy is the total energy of an object due to the kinetic energy of atoms depending on the mass.
2
Q
What is temperature?
A
- Temperature is the average kinetic energy of atoms/ molecules.
3
Q
What is internal energy?
A
- Total energy stored in a system by particles (atoms or molecules.)
- Potential energy + kinetic energy stored in system.
4
Q
What 2 things cause potential energy in a material?
A
- Chemical bonds in molecules.
- Intermolecular forces between atoms/ molecules.
5
Q
Why does gas have greater potential energy than solid?
A
- Weaker intermolecular forces
- Means more energy has gone in to break them.
- More energy stored in potential store.
6
Q
What happens to the potential energy during condensation?
A
- Bonds are made.
- This releases energy
7
Q
If you supply thermal energy at the 0.C to a block of ice, where is the energy stored?
A
- Stored in the POTENTIAL STORE
*Energy is used to break down intermolecular forces, (excess stored in potential store.)
8
Q
Why is there no change of temperature during melting ice at 0 degrees?
A
- Energy supplied used to break intermolecular forces not increase temp.
