B2 Lesson 1 prior learning

What are the features of an ideal gas?

• All collisions between atoms or molecules are perfectly elastic

• There are no intermolecular attractive forces

• Particles which collide but which otherwise do not interact with each other

• All the internal energy is in the form of kinetic energy

• Any change in internal energy is accompanied by a change in temperature.

What is a molecule?

• Two or more atoms joined together

• Two or more different atoms joined together

All matter is made from...

• atoms

• molecules

The mass of different molecules is...

• the same

• different

One mole of a substance contains...

• 6.02 x 10²³ molecules

• an unknown number of molecules

• the same number of molecules as

  $\frac{1}{12}$ carbon-12

Which state of matter has fixed shape and volume since atoms are held together by interatomic force

• solid

• liquid

• gas

Which state of matter has fixed volume but not fixed shape since atoms are able to move relative to each other.

• solid

• liquid

• gas

Which state of matter has no fixed shape or volume (will fill whatever container it is put into); atoms are free to move about with no force between them.

• solid

• liquid

• gas

Internal energy of a gas is

• the sum of the KE and PE of the molecules in a body

• the KE of the molecules in a body

• the PE of the molecules in a body

Temperature is...

• A measure of how hot or cold a body is, related to the average KE of the molecules.

• A measure of how hot or cold a body is, compared to the surroundings

• A measure of how much heat energy is in a body