The particle model describes the arrangement of particles in solids, liquids and gases; it can be used to predict changes when matter is heated.
How can the particles in a solid be described?
In a regular arrangement and vibrate about a fixed position
Are randomly arranged and move around each other
Regular fixed arrangement and move quickly in all directions
Which of these best describes the particles in a gas?
Have a regular fixed arrangement and vibrate around a fixed position
Are randomly arranged and move quickly in all directions
What is temperature a measure of?
The average kinetic energy of the molecules
The average weight of the molecules
The average size of the molecules
What type of change is a change of state?
Neither a chemical or physical change
What is the difference between a physical and a chemical change?
A physical change is easier to reverse
A chemical change is easier to reverse
There is no difference
What effect does a drop in temperature have on the molecules in a material?
None at all
The molecules slow down
The molecules speed up
What happens to the number of particles in a substance as it changes from liquid to gas?
Stays the same
What does an increase in temperature do to the pressure of a gas? (assuming the gas does not expand)
Which description best fits the relationship between a gas and its container?
Maintains a regular shape regardless of the shape of the container
Fills the bottom of the container
Fills the entire container
What is the relationship between pressure and temperature in a gas at fixed volume?