Understanding how electric charge is conserved.
Understanding the concept of nuclear reactions.
The different types of nuclear reactions.
Understanding quantization of charge
How the greenhouse effect works.
Understanding how the Doppler Effect works.
Understanding how charge is transferred through an electroscope.
An explanation of photoelectric effect and how to determine how much energy electrons have.
How the ratio of protons to neutrons affects a nucleus' stability.
The effects of climate change.
The periodic trend of atomic radii.
Understanding electric current.
The effects of dispersion.
Random errors in genes and their effects.
Understanding the effects of population growth.
The effects of natural resource depletion.