Heating Curve Worksheet - Energy



Heating Curve Worksheet Name_________________________

NAHS Physical Science Per ____ Date _________________

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Questions:

1) What is happening to the average kinetic energy of the particles in the sample during section 2? How do you know?

Average Kinetic energy is staying the same because the temperature is not increasing or decreasing

 

2)  As a substance goes through section (2), what happens to the distance between the particles? How do you know?

The particles are spreading out because the kinetic energy is not changing and the heat is transferred into potential energy (interaction energy) of the substance.

3) What is the name of the process happening during section (4)? Vaporization

 

4)  What would be the name of the process happening during section (4) if time were going the other way? Condensation

 

5) What is the melting point of this substance? Between section 1 and 2, 12 degress Celsius

6) At what temperature would this sample finish boiling? Explain.

 

In between section 4 and 5, the substance will finish boiling at about 86 degrees Celsius

7) For section 3, the temperature does not remain constant because:

a. Heat is not being absorbed

b. The ice is colder that the water

c.  Heat energy is being converted to potential energy

d.  Heat energy is being converted to kinetic energy

EXPLAIN YOUR CHOICE:

The temperature and therefore the kinetic energy are increasing at this time.

8) When this substance is melting, the temperature of the ice-water mixture remains constant because:

a. Heat is not being absorbed

b. The ice is colder that the water

c.  Heat energy is being converted to potential energy

d.  Heat energy is being converted to kinetic energy

 EXPLAIN YOUR CHOICE:

The temperature is not changing, so the kinetic energy is staying the same. The energy is going into spreading the particles from a solid state to a liquid state – increasing the potential energy.

9)  The temperature at which a substance in the liquid state freezes is the same as the temperature at which the substance-

a. Melts b. Sublimes c. Boils d. Condenses

EXPLAIN YOUR CHOICE:

Melting and freezing begin at the same temperature, it depends if you are cooling or heating (what direction you are going.

10) Is this curve showing an addition of energy or a release of energy? Explain.

 

The curve is showing an addition of energy to the system because the energy level keeps increasing.

11) Identify the state(s) (phase(s)) of matter in:

a. part 1 on the graph: Solid

b. part 2 on the graph: Solid and Liquid

c. part 3 on the graph: Liquid

d. part 4 on the graph: Liquid and Gas

e. part 5 on the graph: Gas

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