Asmoke sample contains dust particles and several different gases, which have different combinations of molecules. the dust particles are suspended in the gases. which term or terms could be used to describe this sample of smoke?

The sample of smoke described above can be described as a heterogeneous mixture. This type of mixture do not have uniform properties and composition. So, getting a certain small sample would not represent the whole mixture since it does not have uniform composition. 

Venus is hotter then earth and Venus is about the same size as earth