Magnesium and nitrogen gas react in a combination reaction to produce magnesium nitride 3Mg (s) +N 2(g) Mg 3 N 2(s) In a particular experiment, a 7.40L sample of N_{2} reacts completely at STP . The mass of Mg consumed in the reaction is:

9. write the chemical equation for the following word equations. include symbols for physical states in the equation. a. solid zinc sulfide + oxygen gas -> solid zinc oxide + sulfur dioxide gas b. aqueous hydrochloric acid + aqueous barium hydroxide -> aqueous barium chloride + water

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.

How might this scientific phenomena be explained? a paper clip floats on water.