Calcium carbonate in the form of chips reacts with hydrochloric acid. How can we make this reaction go faster

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

Why does his teacher ask him to balance the equation by including the correct coefficient