Q: What is the smallest particle of the element gold (Au) that can still be classified as gold?
A: atom
Q: Which is an example of a chemical reaction?
A: Vinegar added to baking soda forms a gas.
Q: What is the main source of energy that causes water to evaporate from the surface of Earth?
A: sun
Q: When a guitar string is plucked, sound is produced by
A:
the vibrations of the string.