Heating & Cooling Curves
Real-World Examples
States of Matter
Particle Motion
Temperature
100
From Point B to Point C, the substance loses which type(s) of energy?
What is potential energy?
100
This happens when a candle is lit, causing the solid wax near the flame to turn into a liquid.
What is melting?
100
This state of matter has a definite shape and volume.
What is a solid?
100
When heat is added, particles move ___.
What is faster?
100
When a substance changes phase, the temperature ___.
What is stays the same?
200
What is the melting point of the substance?
What is 90°C?
200
Water droplets forming on a cold glass is an example of ___.
What is condensation?
200
This state of matter has the most energy and no definite shape or volume.
What is a gas?
200
This term describes how much particles are moving due to heat energy.
What is kinetic energy?
200
As a substance changes from a gas to a liquid, the heat will do this, and the potential energy will do this.
What is decrease and decrease?
300
What is the boiling point of the following substance?
What is 54°C?
(32°C represents the melting point)
300
This happens when a kettle is heated until the water inside turns into steam and whistles.
What is boiling?
300
In this state, particles flow past each other but stay close together.
What is a liquid?
300
The total energy of all particles in a substance is called ___.
What is internal energy?
300
On a heating curve, the plateau on the graph, where the temperature remains constant, represents ___.
What is a phase change?
400
Point B occurs at time = 2 minutes. The time required to cool the substance from Point B to a liquid at its freezing point is ______ .
What is 4 minutes?
How many minutes did it take to go from Point B to Point C?
Point B Time = 2 minutes
Point C Time = 6 minutes
400
When you step outside on a cold day and see your breath, this phase change is happening.
What is condensation?
400
This state of matter takes the shape of its container but has a fixed volume.
What is a liquid?
400
The type of energy stored in a substance due to the position of its particles.
What is potential energy?
400
As a substance changes from a solid to a liquid, the heat will do this, and the potential energy will do this.
What is increase and increase?
500
From Point C to Point E, the substance loses which type(s) of energy?
What is potential and kinetic energy?
500
When lava cools and hardens into rock, what phase change occurs?
What is freezing?
500
This is the fourth state of matter, found in lightning and stars. In this state, particles are highly energized and electrically charged.
What is plasma?
500
As the temperature of a substance increases, the particles move ____, and their kinetic energy ____.
What is faster and increases?
500
The greatest amount of heat would be required to raise the temperature of a 1 gram sample of water from __.
A. 10°C to 30°C
B. 20°C to 30°C
C. 30°C to 60°C
D. 40°C to 60°C
What is C. 30°C to 60°C?