What coefficient should be included with the Oxygen molecule (O2)? * 2 points
Al + O₂ → Al₂O3
no coefficient needed
O 2
3

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

It will appear as o2(g) as a reactant 

The higher the temperature, the increased rate constant for a reaction.(positive linear association)