Understanding how electric charge is conserved.
Understanding quantization of charge
Understanding the law of conservation of mass.
How momentum is conserved.
Understanding how charge is transferred through an electroscope.
How energy is neither created nor destroyed.
Understanding electric current.
What role does the media play in elections and shaping public opinion?
How to use stoichiometry to work with chemical equations.
What leads citizens to differ in their political beliefs and how do we acquire these beliefs?
The periodic trend of atomic radii.