The three states of matter can be represented by the particle model. This model explains the properties of substances in their different states, as well as changes of state.
How do particles move in a substance in the solid state?
They vibrate about fixed positions
They move around, sliding over each other
They move randomly in all directions
Why can a liquid flow?
Because its particles are in a random arrangement
Because its particles move around, sliding over each other
Because its particles are close together
Why can a gas be compressed?
Because its particles are far apart and have space to move into
Because its particles move randomly in all directions
What is the name of the change of state from gas to liquid?
In which change is energy transferred from the surroundings to the substance?
Why is energy transferred from the substance to the surroundings when a substance freezes?
The forces of attraction between the particles get stronger
The forces of attraction between the particles get weaker
The forces of attraction in the substance must be overcome
Which two states of matter are involved in sublimation?
Solid and gas
Solid and liquid
Liquid and gas
Which of these statements is true?
The stronger the forces of attraction, the higher the melting point
The stronger the forces of attraction, the lower the boiling point
The stronger the forces of attraction, the lower the melting point
A substance has a melting point of -7°C and a boiling point of 59°C. What is its state at room temperature (20°C)?
A substance has a melting point of -210°C and a boiling point of -196°C. What is its state at -190°C?