EduNinja• Describe changes of state in terms of melting, boiling, evaporating, freezing and condensing
A mixture of ice and water is left to stand and the ice melts.
Which row describes what happens as the ice is melting?
temperature of mixture
energy changes
increases
average kinetic energy of particles increases
increases
energy is used to overcome attractive forces
stays the same
average kinetic energy of particles increases
stays the same
energy is used to overcome attractive forces
Particles behave differently when in different physical states.
Name the following changes of state.
Ice turning into water.
Solid carbon dioxide turning directly into gaseous carbon dioxide at room temperature.
Give the name of the process that:
occurs when a gas turns into a liquid
occurs when a solid turns into a gas without first forming a liquid
This question is about states of matter.
Substances can change state.
Boiling and evaporation are two ways in which a liquid changes into a gas.
Describe two differences between boiling and evaporation.
1
2
Name the change of state when:
- a gas becomes a liquid
- a solid becomes a gas.
The following table gives information about six substances.
State all the substances that are liquid at room temperature?
The particles of a substance gain energy and change from a regular ordered structure to a disordered structure with large distances between the particles.
Which change of state is described?
boiling
evaporation
melting
sublimation
A mixture of ice and water is left to stand and the ice melts.
Which row describes what happens as the ice is melting?
temperature of mixture
energy changes
increases
average kinetic energy of particles increases
increases
energy is used to overcome attractive forces
stays the same
average kinetic energy of particles increases
stays the same
energy is used to overcome attractive forces
Four physical changes of ethanol are listed.
1 condensation
2 evaporation
3 freezing
4 boiling
In which changes do the particles move further apart?
1 and 2
1 and 3
2 and 4
3 and 4
The diagram shows the changes of state between a solid, a liquid and a gas.
In which changes of state is energy being given out?
1 and 2
1 and 4
2 and 3
3 and 4
Decane has a freezing point of and a boiling point of .
A small sample of decane is placed in an open beaker in an oven at a temperature of and at atmospheric pressure for 24 hours.
What happens to the sample of decane?
It boils.
It evaporates.
It melts.
It sublimes.