Particles
Temperature
States of Matter
Phase Changes
Models
100
As the temperature of a substance increases, particles move ___.
Faster
100
As temperature increases, pressure _____.
increases.
100
The state of matter represented in the image
Solid
100
The phase change from solid to liquid
Melting
100
Draw a feature of a model representing particle speed / velocity.
arrows
200
As the temperature of a substance decreases, particles move ___.
Slower.
200
As temperature increases, volume increases because
molecules move faster and farther apart.
200
The state of matter with no definite volume or definite shape.
Gas
200
The phase change from liquid to gas
Vaporization
200
Draw a particle model of a ice melting.
Includes:
- labels
- pictures
- arrows
- vibration lines
300
As particles of a substance gain energy and move farther apart, the _____ increases.
Volume
300
This is the temperature where a liquid is converted into a gas.
Boiling Point
300
Draw the particle diagram of a liquid.
Includes:
- vibration lines
- particles slightly spaced apart but relatively close
- not organized in neat rows
300
Draw 2 particles with differing speeds.
demonstrated by two particles with different sized arrows
400
Definition: The amount of force per square meter. Described as the collision between molecules of different substances.
Pressure
400
In terms of force, why does heating a substance convert a liquid into a gas?
The increased temperature is caused by increasing thermal energy and particle velocity. The increased energy allows the particles to overcome attractive forces between them causing them to spread out and form a gas.
400
True or False. Thermal expansion only occurs in gases. Explain.
False. Increasing the temperature of a substance in any state of matter also increases its volume because the increasing thermal energy spreads the molecules farther apart.
400
Icebergs are breaking apart due to what phase change? Why?
Icebergs break apart due to melting caused by the increasing global temperatures. The ice converts into liquid water causing the iceberg to no longer hold a definite form and break apart.
400
Create a model depicting all covered phase changes.
includes:
- melting
- freezing
- boiling
- condensation
500
Why does the water in the straw stay in the straw despite gravity pulling all substances down?
Closing the top of the straw makes the air pressure above and below the water equal cancelling out the force of gravity.
500
Describe the relationship between the freezing point and melting point.
Both occur at the same temperature, however, they occur in opposite directions.
- FP: from liquid to solid
- MP: from solid to liquid
500
Correctly sequence the events causing water vapor to condense into liquid water at the molecular level:
1) The temperature continues to drop.
2) Temperature remains at the condensation point until all water molecules form a liquid.
3) The temperature of the molecules decrease.
4) Water vapor molecules lose energy to the atmosphere and move closer together.
5) The molecules gain increased attraction between them.
6) The water vapor becomes liquid water.
4) Water vapor molecules lose energy to the atmosphere and move closer together.
3) The temperature of the molecules decrease.
5) The molecules gain increased attraction between them.
2) Temperature remains at the condensation point until all water molecules form a liquid.
6) The water vapor becomes liquid water.
1) The temperature continues to drop.
500
Draw a model depicting sublimation.
depicts a solid converting into a gas