What property of the wood would you need to know to predict how fast the wood would start to burn?

The chemical property of combustion.

Explanation:

Combustion is a chemical reaction that occurs between a combustible material, a substance that causes or favors the combustion of other substances that is oxidizer and oxygen, all this accompanied by outgoing energy in the form of heat (exothermic energy) and incandescent energy.

In this case, wood is the combustible material, and combustion is generated by separate energy, fire, phosphors, sparks.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.