International Baccalaureate IB Chemistry

Elements are the primary constituents of matter, which cannot be chemically broken down into simpler substances.

Compounds consist of atoms of different elements chemically bonded together in a fixed ratio. 

Mixtures contain more than one element or compound in no fixed ratio, which are not chemically bonded and so can be separated by physical methods. Distinguish between the properties of elements, compounds and mixtures.

Kinetic molecular theory and states of matter

The kinetic molecular theory is a model to explain physical properties of matter (solids, liquids and gases) and changes of state. 

Distinguish the different states of matter. Use state symbols (s, l, g and aq) in chemical equations. 

Names of the changes of state should be covered: melting, freezing, vaporization (evaporation and boiling), condensation, sublimation and deposition.

The temperature, $T$, in Kelvin ($K$) is a measure of average kinetic energy ($E_k$) of particles.

Interpret observable changes in physical properties and temperature during changes of state. 

Convert between values in the Celsius and Kelvin scales. 

The kelvin ($K$) is the SI unit of temperature and has the same incremental value as the Celsius degree ($^\circ\mathrm{C}$).