Oxygen for complete combustion
Answer : Yes, a precipitate form when a solution of calcium chloride and a solution of mercury(I) nitrate are mixed together.
The net ionic equation will be,

Explanation :
In the net ionic equations, we are not include the spectator ions in the equations.
Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
The given balanced ionic equation will be,

The ionic equation in separated aqueous solution will be,

In this equation,
are the spectator ions.
By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.
The net ionic equation will be,

Actually its the second and fourth one for sure! If you just put one it only gives parcel credit. ;-;
Answer:
Florida is tied for first place as having the fewest earthquakes of any US state. Because Florida is not located near any tectonic plate boundaries like california.
Explanation:
hope this helps :)