Elements in groups 1 and 2 on the periodic table are likely to from which kind of ion? acid
isotope
cation
anion
poly-ion

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.