Chemical reactions can be represented symbolically using chemical equations. in a chemical equation, reactants appear to the left of the arrow, while products appear to the right. the law of conservation of mass states that matter is neither created nor destroyed in a chemical reaction; rather, the existing atoms are just rearranged. therefore, chemical equations must be balanced—that is, the same number of each kind of atom must be present before and after a chemical reaction.
an unbalanced chemical equation is shown below. balance the equation according to the law of conservation of mass.

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.