Heating a Cooling graphs

Question 1

What is internal energy?

Answer 1

• Energy stored in a system by the particles.
• includes kinetic energy (due to the movement of the particles).
• Potential energy (Due to the forces between the particles and bonds between atoms in a molecule).

Question 2

What does the temperature to time graph look like of a solid to liquid?

Answer 2

• Temperature of solid rises as we increase the energy of the particles.
• At some point: Temperature stops rising and line becomes horizontal. Solid is changing into a liquid. (Melting).
• Energy we are putting in weakens or breaks the forces of attraction between the particles.

Temperature does not increase as:

• Increasing internal energy store of thr system.
• Not changing temperarture.

Question 3

What does the graph look like from liquid to gas?

Answer 3

• All the solid has melted into a liquid.
• Temperature rises again.
• Increasing energy of particles.
• At some point: Temperature stops and becomes horizontal.
• Substance is boiling and energy we are putting in breaks forces of attractions.
• Once all liquid has boiled the temperature rises again

Question 4

What does the graph for cooling a gas look like?