Justify or criticize the statement that “the activation energy has no net effect on the energy change of a reaction”.

When balancing a chemical equation:

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.