Heating Curve Flashcards
(31 cards)
What does the cooling curve show?
The changes that take place when a gaseous substance is cooled
What happens to the temperature of a gaseous substance as it is cooled?
It decreases until it reaches its condensation point
What occurs to kinetic energy of gas particles during cooling?
Some kinetic energy is transferred to the surroundings as heat
What happens to gas particles as they cool?
The particles move more slowly
What is the temperature of a liquid substance during cooling?
It decreases until it reaches its freezing point
What occurs to kinetic energy of liquid particles during cooling?
Some kinetic energy is transferred to the surroundings as heat
What happens to liquid particles as they cool?
The particles move more slowly
What happens to the forces of attraction between gas particles during cooling?
They increase
What is the process that occurs when a gas changes to a liquid?
Condensation
What happens to temperature during condensation?
It remains constant
What happens to the forces of attraction between liquid particles as they cool?
They increase further
What is the process that occurs when a liquid changes to a solid?
Freezing
What happens to temperature during freezing?
It remains constant
What happens to the temperature of a solid substance as it cools?
It decreases
What occurs to kinetic energy of solid particles during cooling?
Some kinetic energy is transferred to the surroundings as heat
How do solid particles behave as they cool?
They vibrate about their fixed positions
Fill in the blank: Condensation is the reverse of _______.
[boiling]
Fill in the blank: Freezing is the reverse of _______.
[melting]
What is significant about the boiling point and condensation point of a pure substance?
They are the same temperature
What is significant about the melting point and freezing point of a pure substance?
They are the same temperature
What is the melting point of oxygen?
-219 °C
What is the boiling point of oxygen?
-183 °C
What is the physical state of oxygen at -196 °C?
Liquid
What is the physical state of oxygen at 25 °C?
Gas
