Which combination of elements are most likely to react to form ionic compounds

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

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.

Which material burns faster? metal aluminum