Give the meaning of a dh value of –400 kj in a reaction.

There are main groups in the modern periodic table of elements

The table describes how some substances were formed substance 19 description formed by boiling pure water formed by combining three hydrogen atoms to every nitrogen atom formed by adding 5 g of sugar to 1 l of water formed by compressing carbon under high pressure based on the given descriptions, which substance is most likely a mixture?

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory