How many grams of zinc will react with 25 mL of 4.0 M HCl solution to produce hydrogen gas

In 2002, the rare earth elements mine in mountain pass, california was closed because

Suppose the universe were completely empty except for one object-a solid sphere moving through space of 100 km/s. what sort of path would the object be moving in? explain your answer

Which describes fat? a: a carbohydrate that produces energy b: a nucleic acid that directs cell function c: a lipid that stores energy d: a protein that speeds up a chemical reaction