Convert 4 moles to CaO molecules *must show work to get credit*

Matches the chemical name of each oxide of phosphorus to its chemical formula

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?

Why is the bottom layer of a trophic pyrimid the