Why do substances burn with or without flame?

What approach is required to balance the objectives of sustainable development? balancing the objectives of sustainable development requires a(n) .

Calculate the number of molecules present in 0.750 mol of mgo.

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.