What are some limitations to your direct observations of your environment? Give an example of an observation that could be made without using an instrument, but would be improved by using one. Give an example of an observation that could not be made without the use of an instrument.

Two models of the same compound are shown. in what way is model b better than model a? model b shows the types of elements in the compound, but model a does not. model b shows the three-dimensional shape of the molecule, but model a does not. model b shows how the atoms in the molecule are connected, but model a does not. model b shows the number of atoms of each element in the molecule, but model a does not